ID CVE-2006-3640 Type cve Reporter cve@mitre.org Modified 2018-10-12T21:40:00
Description
Microsoft Internet Explorer 5.01 and 6 allows certain script to persist across navigations between pages, which allows remote attackers to obtain the window location of visited web pages in other domains or zones, aka "Window Location Information Disclosure Vulnerability."
{"osvdb": [{"lastseen": "2017-04-28T13:20:24", "bulletinFamily": "software", "description": "## Vulnerability Description\nMicrosoft Internet Explorer contains a flaw that may lead to an unauthorized information disclosure. \u00a0The issue is triggered when a user accesses a web page that contains a malicious script that persists across navigation between pages, which will disclose window location of visited web pages in other domains resulting in a loss of confidentiality.\n## Solution Description\nMicrosoft has released a patch to address this issue. Additionally, it is possible to correct the flaw by implementing the following workaround(s): Disable active scripting.\n## Short Description\nMicrosoft Internet Explorer contains a flaw that may lead to an unauthorized information disclosure. \u00a0The issue is triggered when a user accesses a web page that contains a malicious script that persists across navigation between pages, which will disclose window location of visited web pages in other domains resulting in a loss of confidentiality.\n## References:\nSecurity Tracker: 1016663\n[Secunia Advisory ID:21396](https://secuniaresearch.flexerasoftware.com/advisories/21396/)\n[Related OSVDB ID: 27852](https://vulners.com/osvdb/OSVDB:27852)\n[Related OSVDB ID: 27851](https://vulners.com/osvdb/OSVDB:27851)\n[Related OSVDB ID: 27853](https://vulners.com/osvdb/OSVDB:27853)\n[Related OSVDB ID: 27854](https://vulners.com/osvdb/OSVDB:27854)\n[Related OSVDB ID: 27855](https://vulners.com/osvdb/OSVDB:27855)\nNews Article: http://www.techworld.com/security/news/index.cfm?newsID=6581\nMicrosoft Security Bulletin: MS06-042\nMicrosoft Knowledge Base Article: 918899\nKeyword: aka \"Window Location Information Disclosure Vulnerability.\" \nFrSIRT Advisory: ADV-2006-3212\n[CVE-2006-3640](https://vulners.com/cve/CVE-2006-3640)\nBugtraq ID: 19339\n", "modified": "2006-08-08T17:50:10", "published": "2006-08-08T17:50:10", "href": "https://vulners.com/osvdb/OSVDB:27850", "id": "OSVDB:27850", "title": "Microsoft IE Cross Site Window Location Information Disclosure", "type": "osvdb", "cvss": {"score": 5.0, "vector": "AV:NETWORK/AC:LOW/Au:NONE/C:PARTIAL/I:NONE/A:NONE/"}}], "securityvulns": [{"lastseen": "2018-08-31T11:10:18", "bulletinFamily": "software", "description": "Microsoft Security Bulletin MS06-042\r\nCumulative Security Update for Internet Explorer (918899)\r\nPublished: August 8, 2006\r\n\r\nVersion: 1.0\r\nSummary\r\n\r\nWho should read this document: Customers who use Microsoft Windows\r\n\r\nImpact of Vulnerability: Remote Code Execution\r\n\r\nMaximum Severity Rating: Critical\r\n\r\nRecommendation: Customers should apply the update immediately.\r\n\r\nSecurity Update Replacement: This bulletin replaces several prior security updates. See the frequently asked questions (FAQ) section of this bulletin for the complete list.\r\n\r\nCaveats: Microsoft Knowledge Base Article 918899 documents the currently known issues that customers may experience when they install this security update. The article also documents recommended solutions for these issues. For more information, see Microsoft Knowledge Base Article 918899.\r\n\r\nTested Software and Security Update Download Locations:\r\n\r\nAffected Software:\r\n\u2022\t\r\n\r\nMicrosoft Windows 2000 Service Pack 4\r\n\u2022\t\r\n\r\nMicrosoft Windows XP Service Pack 1 and Microsoft Windows XP Service Pack 2\r\n\u2022\t\r\n\r\nMicrosoft Windows XP Professional x64 Edition\r\n\u2022\t\r\n\r\nMicrosoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1\r\n\u2022\t\r\n\r\nMicrosoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with SP1 for Itanium-based Systems\r\n\u2022\t\r\n\r\nMicrosoft Windows Server 2003 x64 Edition\r\n\r\nTested Microsoft Windows Components:\r\n\r\nAffected Components:\r\n\u2022\t\r\n\r\nInternet Explorer 5.01 Service Pack 4 on Microsoft Windows 2000 Service Pack 4 \u2014 Download the update\r\n\u2022\t\r\n\r\nInternet Explorer 6 Service Pack 1 on Microsoft Windows 2000 Service Pack 4 or on Microsoft Windows XP Service Pack 1 \u2014 Download the update\r\n\u2022\t\r\n\r\nInternet Explorer 6 for Microsoft Windows XP Service Pack 2 \u2014 Download the update\r\n\u2022\t\r\n\r\nInternet Explorer 6 for Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1 \u2014 Download the update\r\n\u2022\t\r\n\r\nInternet Explorer 6 for Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with SP1 for Itanium-based Systems \u2014 Download the update\r\n\u2022\t\r\n\r\nInternet Explorer 6 for Microsoft Windows Server 2003 x64 Edition \u2014 Download the update\r\n\u2022\t\r\n\r\nInternet Explorer 6 for Microsoft Windows XP Professional x64 Edition \u2014 Download the update\r\n\r\nThe software in this list has been tested to determine whether the versions are affected. Other versions either no longer include security update support or may not be affected. To determine the support life cycle for your product and version, visit the Microsoft Support Lifecycle Web site.\r\n\r\nNote The security updates for Microsoft Windows Server 2003, Windows Server 2003 Service Pack 1, and Windows Server 2003 x64 Edition also apply to Windows Server 2003 R2.\r\nTop of sectionTop of section\r\nGeneral Information\r\n\t\r\nExecutive Summary\r\n\r\nExecutive Summary:\r\n\r\nThis update resolves several newly discovered, publicly and privately reported vulnerabilities. Each vulnerability is documented in its own \u201cVulnerability Details\u201d section of this bulletin.\r\n\r\nIf a user is logged on with administrative user rights, an attacker who successfully exploited the most severe of these vulnerabilities could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\r\n\r\nWe recommend that customers apply the update immediately.\r\n\r\nSeverity Ratings and Vulnerability Identifiers:\r\nVulnerability Identifiers\tImpact of Vulnerability\tInternet Explorer 5.01 Service Pack 4 on Windows 2000 Service Pack 4\tInternet Explorer 6 Service Pack 1 for Windows XP Service Pack 1 and Windows 2000 Service Pack 4\tInternet Explorer 6 for Windows XP Service Pack 2\tInternet Explorer 6 for Windows Server 2003\tInternet Explorer 6 for Windows Server 2003 Service Pack 1\r\n\r\nRedirect Cross-Domain Information Disclosure Vulnerability - CVE-2006-3280\r\n\t\r\n\r\nInformation Disclosure\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nLow\r\n\t\r\n\r\nLow\r\n\r\nHTML Layout and Positioning Memory Corruption Vulnerability - CVE-2006-3450\r\n\t\r\n\r\nRemote Code Execution\r\n\t\r\n\r\nNone\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\r\nCSS Memory Corruption Vulnerability - CVE-2006-3451\r\n\t\r\n\r\nRemote Code Execution\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nNone\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nModerate\r\n\r\nHTML Rendering Memory Corruption Vulnerability - CVE-2006-3637\r\n\t\r\n\r\nRemote Code Execution\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nModerate\r\n\r\nCOM Object Instantiation Memory Corruption Vulnerability - CVE-2006-3638\r\n\t\r\n\r\nRemote Code Execution\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nModerate\r\n\r\nSource Element Cross-Domain Vulnerability - CVE-2006-3639\r\n\t\r\n\r\nRemote Code Execution and Information Disclosure\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nImportant\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nModerate\r\n\r\nWindow Location Information Disclosure Vulnerability - CVE-2006-3640\r\n\t\r\n\r\nInformation Disclosure\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nModerate\r\n\t\r\n\r\nLow\r\n\t\r\n\r\nLow\r\n\r\nFTP Server Command Injection Vulnerability CVE-2004-1166\r\n\t\r\n\r\nElevation of Privilege\r\n\t\r\n\r\nLow\r\n\t\r\n\r\nLow\r\n\t\r\n\r\nLow\r\n\t\r\n\r\nLow\r\n\t\r\n\r\nLow\r\n\r\nAggregate Severity of All Vulnerabilities\r\n\t\r\n\r\n \r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\t\r\n\r\nCritical\r\n\r\nThis assessment is based on the types of systems that are affected by the vulnerability, their typical deployment patterns, and the effect that exploiting the vulnerability would have on them.\r\n\r\nNote By default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates some of the vulnerabilities. See the FAQ section for this security update for more information about Internet Explorer Enhanced Security Configuration.\r\n\r\nNote The severity ratings for non-x86 operating system versions map to the x86 operating systems versions as follows:\r\n\u2022\t\r\n\r\nThe Microsoft Windows XP Professional x64 Edition severity rating is the same as the Windows XP Service Pack 2 severity rating.\r\n\u2022\t\r\n\r\nThe Microsoft Windows Server 2003 for Itanium-based Systems severity rating is the same as the Windows Server 2003 severity rating.\r\n\u2022\t\r\n\r\nThe Microsoft Windows Server 2003 with SP1 for Itanium-based Systems severity rating is the same as the Windows Server 2003 Service Pack 1 severity rating.\r\n\u2022\t\r\n\r\nThe Microsoft Windows Server 2003 x64 Edition severity rating is the same as the Windows Server 2003 Service Pack 1 severity rating.\r\nTop of sectionTop of section\r\n\t\r\nFrequently Asked Questions (FAQ) Related to This Security Update\r\n\r\nWhat updates does this release replace?\r\nThis security update replaces several prior security updates. The most recent security bulletin ID and affected operating systems are listed in the following table.\r\nBulletin ID\tInternet Explorer 5.01 Service Pack 4\tInternet Explorer 6 Service Pack 1 (all versions earlier than Windows Server 2003)\tInternet Explorer 6 for Windows Server 2003 \tInternet Explorer 6 for Windows Server 2003 Service Pack 1\tInternet Explorer 6 for Windows XP Service Pack 2\r\n\r\nMS06-021\r\n\t\r\n\r\nReplaced\r\n\t\r\n\r\nReplaced\r\n\t\r\n\r\nReplaced\r\n\t\r\n\r\nReplaced\r\n\t\r\n\r\nReplaced\r\n\r\nWhat are the known issues that customers may experience when they install this security update?\r\nMicrosoft Knowledge Base Article 918899 documents the currently known issues that customers may experience when they install this security update. The article also documents recommended solutions for these issues. For more information, see Microsoft Knowledge Base Article 918899.\r\n\r\nDoes this update contain any security-related changes to functionality?\r\nYes. Besides the changes that are listed in the \u201cVulnerability Details\u201d section of this bulletin, also included are security-related changes that were introduced in previous Internet Explorer bulletins.\r\n\r\nDoes this update contain any other changes to functionality?\r\nYes. Besides the changes that are listed in the \u201cVulnerability Details\u201d section of this bulletin, there are also changes not related to security that were introduced in previous Internet Explorer bulletins.\r\n\r\nLike the security update included with MS06-021 this security update also replaces the compatibility patch released on April 11, 2006. That compatibility patch temporarily returned Internet Explorer to the previous functionality for handling ActiveX controls, to help enterprise customers who needed more time to prepare for the ActiveX update changes discussed in Microsoft Knowledge Base Article 912945 . This security update replaces that compatibility patch, and makes the changes in Microsoft Knowledge Base Article 912945 permanent. For more information about these changes, see Microsoft Knowledge Base Article 912945 and the product documentation.\r\n\r\nThe changes were first introduced in updates for Windows XP Service Pack 2, Windows Server 2003 Service Pack 1, Windows XP Professional x64 Edition, Windows Server 2003 x64 Edition family, and Windows Server 2003 with Service Pack 1 for Itanium-based Systems on February 28, 2006. For more information about this update, see Microsoft Knowledge Base Article 912945.\r\n\r\nThe changes are also included in Microsoft Security Bulletin MS06-013 and subsequent security bulletins for Internet Explorer for the same versions of Windows.\r\n\r\nWhat is the Internet Explorer Enhanced Security Configuration?\r\nInternet Explorer Enhanced Security Configuration is a group of preconfigured Internet Explorer settings that reduce the likelihood of a user or of an administrator downloading and running specially crafted Web content on a server. Internet Explorer Enhanced Security Configuration reduces this risk by modifying many security-related settings. This includes the settings on the Security tab and the Advanced tab in the Internet Options dialog box. Some of the important modifications include the following:\r\n\u2022\t\r\n\r\nSecurity level for the Internet zone is set to High. This setting disables scripts, ActiveX controls, Microsoft Java Virtual Machine (MSJVM), and file downloads.\r\n\u2022\t\r\n\r\nAutomatic detection of intranet sites is disabled. This setting assigns all intranet Web sites and all Universal Naming Convention (UNC) paths that are not explicitly listed in the Local intranet zone to the Internet zone.\r\n\u2022\t\r\n\r\nInstall On Demand and non-Microsoft browser extensions are disabled. This setting prevents Web pages from automatically installing components and prevents non-Microsoft extensions from running.\r\n\u2022\t\r\n\r\nMultimedia content is disabled. This setting prevents music, animations, and video clips from running.\r\n\r\nExtended security update support for Windows 98, Windows 98 Second Edition, or Windows Millennium Edition ended on July 11, 2006. I am still using one of these operating systems, what should I do?\r\nWindows 98, Windows 98 Second Edition, and Windows Millennium Edition have reached the end of their support life cycles. It should be a priority for customers who have these operating system versions to migrate to supported versions to prevent potential exposure to vulnerabilities. For more information about the Windows Product Lifecycle, visit the following Microsoft Support Lifecycle Web site. For more information about the extended security update support period for these operating system versions, visit the Microsoft Product Support Services Web site.\r\n\r\nExtended security update support for Microsoft Windows NT Workstation 4.0 Service Pack 6a and Windows 2000 Service Pack 2 ended on June 30, 2004. Extended security update support for Microsoft Windows NT Server 4.0 Service Pack 6a ended on December 31, 2004. Extended security update support for Microsoft Windows 2000 Service Pack 3 ended on June 30, 2005. I am still using one of these operating systems, what should I do?\r\nWindows NT Workstation 4.0 Service Pack 6a, Windows NT Server 4.0 Service Pack 6a, Windows 2000 Service Pack 2, and Windows 2000 Service Pack 3 have reached the end of their support life cycles. It should be a priority for customers who have these operating system versions to migrate to supported versions to prevent potential exposure to vulnerabilities. For more information about the Windows Product Support Lifecycle, visit the following Microsoft Support Lifecycle Web site. For more information about the extended security update support period for these operating system versions, visit the Microsoft Product Support Services Web site.\r\n\r\nCustomers who require custom support for these products must contact their Microsoft account team representative, their Technical Account Manager, or the appropriate Microsoft partner representative for custom support options. Customers without an Alliance, Premier, or Authorized Contract can contact their local Microsoft sales office. For contact information, visit the Microsoft Worldwide Information Web site, select the country, and then click Go to see a list of telephone numbers. When you call, ask to speak with the local Premier Support sales manager. For more information, see the Windows Operating System Product Support Lifecycle FAQ.\r\n\r\nCan I use the Microsoft Baseline Security Analyzer (MBSA) to determine whether this update is required?\r\nThe following table provides the MBSA detection summary for this security update.\r\nSoftware\tMBSA 1.2.1\tMBSA 2.0\r\n\r\nMicrosoft Windows 2000 Service Pack 4\r\n\t\r\n\r\nYes\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows XP Service Pack 1 and Microsoft Windows XP Service Pack 2\r\n\t\r\n\r\nYes\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows XP Professional x64 Edition\r\n\t\r\n\r\nNo\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1\r\n\t\r\n\r\nYes\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with Service Pack 1 for Itanium-based Systems\r\n\t\r\n\r\nNo\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows Server 2003 x64 Edition family\r\n\t\r\n\r\nNo\r\n\t\r\n\r\nYes\r\n\r\nFor more information about MBSA, visit the MBSA Web site. For more information about the software that Microsoft Update and MBSA 2.0 currently do not detect, see Microsoft Knowledge Base Article 895660.\r\n\r\nFor more detailed information, see Microsoft Knowledge Base Article 910723.\r\n\r\nCan I use Systems Management Server (SMS) to determine whether this update is required?\r\nThe following table provides the SMS detection summary for this security update.\r\nSoftware\tSMS 2.0\tSMS 2003\r\n\r\nMicrosoft Windows 2000 Service Pack 4\r\n\t\r\n\r\nYes\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows XP Service Pack 1 and Microsoft Windows XP Service Pack 2\r\n\t\r\n\r\nYes\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows XP Professional x64 Edition\r\n\t\r\n\r\nNo\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1\r\n\t\r\n\r\nYes\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with Service Pack 1 for Itanium-based Systems\r\n\t\r\n\r\nNo\r\n\t\r\n\r\nYes\r\n\r\nMicrosoft Windows Server 2003 x64 Edition family\r\n\t\r\n\r\nNo\r\n\t\r\n\r\nYes\r\n\r\nSMS uses MBSA for detection. Therefore, SMS has the same limitation that is listed earlier in this bulletin related to software that MBSA does not detect.\r\n\r\nFor SMS 2.0, the SMS SUS Feature Pack, which includes the Security Update Inventory Tool, can be used by SMS to detect security updates. SMS SUIT uses the MBSA 1.2.1 engine for detection. For more information about the Security Update Inventory Tool, visit the following Microsoft Web site. For more information about the limitations of the Security Update Inventory Tool, see Microsoft Knowledge Base Article 306460. The SMS SUS Feature Pack also includes the Microsoft Office Inventory Tool to detect required updates for Microsoft Office applications.\r\n\r\nFor SMS 2003, the SMS 2003 Inventory Tool for Microsoft Updates can be used by SMS to detect security updates that are offered by Microsoft Update and that are supported by Windows Server Update Services. For more information about the SMS 2003 Inventory Tool for Microsoft Updates, visit the following Microsoft Web site. SMS 2003 can also use the Microsoft Office Inventory Tool to detect required updates for Microsoft Office applications.\r\n\r\nFor more information about SMS, visit the SMS Web site.\r\n\r\nFor more detailed information, see Microsoft Knowledge Base Article 910723.\r\nTop of sectionTop of section\r\n\t\r\nVulnerability Details\r\n\t\r\nRedirect Cross-Domain Information Disclosure Vulnerability - CVE-2006-3280:\r\n\r\nAn information disclosure vulnerability exists in Internet Explorer in the way that a redirect is handled. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could allow for information disclosure if a user viewed the Web page. An attacker who successfully exploited this vulnerability could read file data from a Web page in another Internet Explorer domain. This other Web page must use gzip encoding or some other compression type supported by Internet Explorer for any information disclosure to occur. This other Web page must also be cached on the client side for a successful exploit.\r\n\t\r\nMitigating Factors for Redirect Cross-Domain Information Disclosure Vulnerability - CVE-2006-3280:\r\n\u2022\t\r\n\r\nIn a Web-based attack scenario, an attacker would have to host a Web site that contains a Web page that is used to exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to persuade them to visit the Web site, typically by getting them to click a link that takes them to the attacker's Web site.\r\n\u2022\t\r\n\r\nData from Web pages in other domains or Internet Explorer zones could only be exposed to an attacker if those Web pages use gzip encoding or some other compression type supported by Internet Explorer.\r\n\u2022\t\r\n\r\nData from Web pages in other domains or Internet Explorer zones could only be exposed to an attacker if those Web pages allow caching of their content.\r\n\u2022\t\r\n\r\nThe Restricted sites zone helps reduce attacks that could try to exploit this vulnerability by preventing Active Scripting from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, they could still be vulnerable to this issue through the Web-based attack scenario.\r\n\r\nBy default, Outlook Express 6, Outlook 2002, and Outlook 2003 open HTML e-mail messages in the Restricted sites zone. Additionally Outlook 2000 opens HTML e-mail messages in the Restricted sites zone if the Outlook E-mail Security Update has been installed. Outlook Express 5.5 Service Pack 2 opens HTML e-mail messages in the Restricted sites zone if Microsoft Security Bulletin MS04-018 has been installed.\r\n\u2022\t\r\n\r\nBy default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates this vulnerability in the e-mail vector because reading e-mail messages in plain text is the default configuration for Outlook Express. See the FAQ section of this security update for more information about Internet Explorer Enhanced Security Configuration.\r\nTop of sectionTop of section\r\n\t\r\nWorkarounds for Redirect Cross-Domain Information Disclosure Vulnerability - CVE-2006-3280:\r\n\r\nMicrosoft has tested the following workarounds. While these workarounds will not correct the underlying vulnerability, they help block known attack vectors. When a workaround reduces functionality, it is identified in the following section.\r\n\u2022\t\r\n\r\nDisable caching of Web content in Internet Explorer\r\n\r\nYou can help protect against this vulnerability by changing your settings to disable caching of Web content in Internet Explorer.\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Internet Options on the Tools menu.\r\n\r\n2.\r\n\t\r\n\r\nClick the General tab.\r\n\r\n3.\r\n\t\r\n\r\nClick Settings\u2026 in the Temporary Internet Files section.\r\n\r\n4.\r\n\t\r\n\r\nClick Every visit to the page, in the Check for newer versions of stored pages section and then click OK.\r\n\r\n5.\r\n\t\r\n\r\nClick OK to return to Internet Explorer.\r\n\u2022\t\r\n\r\nDisable caching of your Web site\u2019s content\r\n\r\nYou can help protect against this vulnerability by changing your settings to disable caching of your Web site\u2019s content. Data from your Web pages would then not be exposed to an attacker. For more information see Microsoft Knowledge Base Article 234067.\r\n\u2022\t\r\n\r\nConfigure Internet Explorer to prompt before running Active Scripting or disable Active Scripting in the Internet and Local intranet security zone\r\n\r\nYou can help protect against this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Internet Options on the Tools menu.\r\n\r\n2.\r\n\t\r\n\r\nClick the Security tab.\r\n\r\n3.\r\n\t\r\n\r\nClick Internet, and then click Custom Level.\r\n\r\n4.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n5.\r\n\t\r\n\r\nClick Local intranet, and then click Custom Level.\r\n\r\n6.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n7.\r\n\t\r\n\r\nClick OK two times to return to Internet Explorer.\r\n\r\nNote Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.\r\n\r\nImpact of Workaround: There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nSet Internet and Local intranet security zone settings to \u201cHigh\u201d to prompt before running ActiveX Controls and Active Scripting in these zones\r\n\r\nYou can help protect against this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls. You can do this by setting your browser security to High.\r\n\r\nTo raise the browsing security level in Microsoft Internet Explorer, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nOn the Internet Explorer Tools menu, click Internet Options.\r\n\r\n2.\r\n\t\r\n\r\nIn the Internet Options dialog box, click the Security tab, and then click the Internet icon.\r\n\r\n3.\r\n\t\r\n\r\nUnder Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.\r\n\r\nNote If no slider is visible, click Default Level, and then move the slider to High.\r\n\r\nNote Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.\r\n\r\nImpact of Workaround: There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\nTop of sectionTop of section\r\n\t\r\nFAQ for Redirect Cross-Domain Information Disclosure Vulnerability - CVE-2006-3280:\r\n\r\nWhat is the scope of the vulnerability?\r\nThis is an information disclosure vulnerability. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could allow for information disclosure if a user viewed the Web page. An attacker who successfully exploited this vulnerability could read data from a Web page in another Internet Explorer domain.\r\n\r\nWhat causes the vulnerability?\r\nInternet Explorer incorrectly interprets the location of a Web page after a redirect to a Web page that uses gzip encoding or some other compression type supported by Internet Explorer. In addition, data from Web pages in other domains or Internet Explorer zones could only be exposed to an attacker if those Web pages allow caching of their content.\r\n\r\nWhat might an attacker use the vulnerability to do?\r\nAn attacker who successfully exploited this vulnerability could read data from another security zone or domain in Internet Explorer.\r\n\r\nWhat are Internet Explorer security zones?\r\nInternet Explorer security zones are part of a system that divides online content into categories or zones, based on the trustworthiness of the content. Specific Web domains can be assigned to a zone, depending on how much trust is put in the content of each domain. The zone then restricts the capabilities of the Web content, based on the zone's policy. By default, most Internet domains are treated as part of the Internet zone. By default, the policy of the Internet zone prevents scripts and other active code from accessing resources on the local system.\r\n\r\nHow could an attacker exploit the vulnerability?\r\nAn attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site. This can also include Web sites that accept user-provided content or advertisements, Web sites that host user-provided content or advertisements, and compromised Web sites. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger request that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.\r\n\r\nWhat systems are primarily at risk from the vulnerability?\r\nThis vulnerability requires a user to be logged on and visiting a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.\r\n\r\nWhat does the update do?\r\nThe update removes the vulnerability by changing Internet Explorer so that it correctly identifies the domain from which the browser window originated.\r\n\r\nWhen this security bulletin was issued, had this vulnerability been publicly disclosed?\r\nYes. This vulnerability has been publicly disclosed. It has been assigned Common Vulnerability and Exposure number CVE-2006-3280.\r\n\r\nWhen this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?\r\nNo. Microsoft had seen examples of proof of concept code published publicly but had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.\r\n\r\nDoes applying this security update help protect customers from the code that has been published publicly that attempts to exploit this vulnerability?\r\nYes. This security update addresses the vulnerability that potentially could be exploited by using the published proof of concept code. The vulnerability that has been addressed has been assigned the Common Vulnerability and Exposure number CVE-2006-3280.\r\n\r\nNote Customers who have tested the proof of concept code on a system should clear the Internet Explorer \u201cTemporary Internet files\u201d folder. This should be done before testing the proof of concept code again after applying this security update. To do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Internet Options on the Tools menu.\r\n\r\n2.\r\n\t\r\n\r\nClick the General tab.\r\n\r\n3.\r\n\t\r\n\r\nUnder Temporary Internet files, click Delete cookies\u2026, and then click OK.\r\n\r\nNote Some Web sites store your member name and password or other personally identifiable information about you in a cookie; therefore, if you delete a cookie, you may need to re-enter this information the next time you visit the site.\r\n\r\n4.\r\n\t\r\n\r\nUnder Temporary Internet files, click Delete files\u2026, and then click OK.\r\n\r\n5.\r\n\t\r\n\r\nClick OK to return to Internet Explorer.\r\nTop of sectionTop of section\r\nTop of sectionTop of section\r\n\t\r\nHTML Layout and Positioning Memory Corruption Vulnerability - CVE-2006-3450:\r\n\r\nA remote code execution vulnerability exists in the way Internet Explorer interprets HTML with certain layout positioning combinations. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.\r\n\t\r\nMitigating Factors for HTML Layout and Positioning Memory Corruption Vulnerability - CVE-2006-3450:\r\n\u2022\t\r\n\r\nIn a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or instant messenger message that takes users to the attacker's Web site.\r\n\u2022\t\r\n\r\nAn attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\r\n\u2022\t\r\n\r\nThe Restricted sites zone helps reduce attacks that could try to exploit this vulnerability by preventing Active Scripting from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, the user could still be vulnerable to this issue through the Web-based attack scenario.\r\n\r\nBy default, Outlook Express 6, Outlook 2002, and Outlook 2003 open HTML e-mail messages in the Restricted sites zone. Additionally Outlook 2000 opens HTML e-mail messages in the Restricted sites zone if the Outlook E-mail Security Update has been installed. Outlook Express 5.5 Service Pack 2 opens HTML e-mail messages in the Restricted sites zone if Microsoft Security Bulletin MS04-018 has been installed.\r\n\r\nNote It cannot be ruled out that this vulnerability could be used in an exploit without Active Scripting. However, using Active Scripting significantly increases the chances of a successful exploit. As a result, this vulnerability has been given a severity rating of Critical on Windows Server 2003.\r\n\u2022\t\r\n\r\nBy default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates this vulnerability in the e-mail vector because reading e-mail messages in plain text is the default configuration for Outlook Express. See the FAQ section of this security update for more information about Internet Explorer Enhanced Security Configuration.\r\nTop of sectionTop of section\r\n\t\r\nWorkarounds for HTML Layout and Positioning Memory Corruption Vulnerability - CVE-2006-3450:\r\n\r\nMicrosoft has tested the following workarounds. Although these workarounds will not correct the underlying vulnerability, they help block known attack vectors. When a workaround reduces functionality, it is identified in the following section.\r\n\r\nNote It cannot be ruled out that this vulnerability could be used in an exploit without Active Scripting. However, using Active Scripting significantly increases the chances of a successful exploit. As a result, this vulnerability has been given a severity rating of Critical on Windows Server 2003.\r\n\u2022\t\r\n\r\nConfigure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone\r\n\r\nYou can help protect against this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Internet Options on the Tools menu.\r\n\r\n2.\r\n\t\r\n\r\nClick the Security tab.\r\n\r\n3.\r\n\t\r\n\r\nClick Internet, and then click Custom Level.\r\n\r\n4.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n5.\r\n\t\r\n\r\nClick Local intranet, and then click Custom Level.\r\n\r\n6.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n7.\r\n\t\r\n\r\nClick OK two times to return to Internet Explorer.\r\n\r\nNote Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.\r\n\r\nImpact of Workaround: There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nSet Internet and Local intranet security zone settings to \u201cHigh\u201d to prompt before running ActiveX Controls and Active Scripting in these zones\r\n\r\nYou can help protect against this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls and Active Scripting. You can do this by setting your browser security to High.\r\n\r\nTo raise the browsing security level in Microsoft Internet Explorer, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nOn the Internet Explorer Tools menu, click Internet Options.\r\n\r\n2.\r\n\t\r\n\r\nIn the Internet Options dialog box, click the Security tab, and then click the Internet icon.\r\n\r\n3.\r\n\t\r\n\r\nUnder Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.\r\n\r\nNote If no slider is visible, click Default Level, and then move the slider to High.\r\n\r\nNote Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.\r\n\r\nImpact of Workaround: There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nRead e-mail messages in plain text format if you are using Outlook 2002 or a later version, or Outlook Express 6 SP1 or a later version, to help protect yourself from the HTML e-mail attack vector.\r\n\r\nMicrosoft Outlook 2002 users who have applied Office XP Service Pack 1 or a later version and Microsoft Outlook Express 6 users who have applied Internet Explorer 6 Service Pack 1 or a later version can enable this setting and view e-mail messages that are not digitally signed or e-mail messages that are not encrypted in plain text only.\r\n\r\nDigitally signed e-mail messages or encrypted e-mail messages are not affected by the setting and may be read in their original formats. For more information about how to enable this setting in Outlook 2002, see Microsoft Knowledge Base Article 307594.\r\n\r\nFor information about this setting in Outlook Express 6, see Microsoft Knowledge Base Article 291387.\r\n\r\nImpact of Workaround: E-mail messages that are viewed in plain text format will not contain pictures, specialized fonts, animations, or other rich content. Additionally:\r\n\u2022\t\r\n\r\nThe changes are applied to the preview pane and to open messages.\r\n\u2022\t\r\n\r\nPictures become attachments so that they are not lost.\r\n\u2022\t\r\n\r\nBecause the message is still in Rich Text or HTML format in the store, the object model (custom code solutions) may behave unexpectedly.\r\nTop of sectionTop of section\r\n\t\r\nFAQ for HTML Layout and Positioning Memory Corruption Vulnerability - CVE-2006-3450:\r\n\r\nWhat is the scope of the vulnerability?\r\nThis is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could remotely take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.\r\n\r\nWhat causes the vulnerability?\r\nWhen Internet Explorer handles specially crafted HTML with certain layout positioning combinations it may corrupt system memory in such a way that an attacker could execute arbitrary code.\r\n\r\nWhat might an attacker use the vulnerability to do?\r\nAn attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\r\n\r\nHow could an attacker exploit the vulnerability?\r\nAn attacker could host a specially crafted Web site or HTML e-mail message that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site or HTML e-mail message. This can also include Web sites that accept user-provided content or advertisements, Web sites that host user-provided content or advertisements, and compromised Web sites. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger request that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.\r\n\r\nWhat systems are primarily at risk from the vulnerability?\r\nThis vulnerability requires that a user is logged on and reading HTML e-mail messages or that a user is logged on and visits a Web site for any malicious action to occur. Therefore, any systems where HTML e-mail messages are read or where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.\r\n\r\nNote It cannot be ruled out that this vulnerability could be used in an exploit without Active Scripting. However, using Active Scripting significantly increases the chances of a successful exploit. As a result, this vulnerability has been given a severity rating of Critical on Windows Server 2003.\r\n\r\nWhat does the update do?\r\nThe update removes the vulnerability by modifying the way that Internet Explorer decodes layout positioning in HTML.\r\n\r\nWhen this security bulletin was issued, had this vulnerability been publicly disclosed?\r\nNo. Microsoft received information about this vulnerability through responsible disclosure.\r\n\r\nWhen this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?\r\nNo. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.\r\nTop of sectionTop of section\r\nTop of sectionTop of section\r\n\t\r\nCSS Memory Corruption Vulnerability - CVE-2006-3451:\r\n\r\nA remote code execution vulnerability exists in the way Internet Explorer handles chained Cascading Style Sheets (CSS). An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.\r\n\t\r\nMitigating Factors for CSS Memory Corruption Vulnerability - CVE-2006-3451:\r\n\u2022\t\r\n\r\nIn a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or instant messenger message that takes users to the attacker's Web site.\r\n\u2022\t\r\n\r\nAn attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\r\n\u2022\t\r\n\r\nThe Restricted sites zone helps reduce attacks that could try to exploit this vulnerability by preventing Active Scripting from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, they could still be vulnerable to this issue through the Web-based attack scenario.\r\n\r\nBy default, Outlook Express 6, Outlook 2002, and Outlook 2003 open HTML e-mail messages in the Restricted sites zone. Additionally Outlook 2000 opens HTML e-mail messages in the Restricted sites zone if the Outlook E-mail Security Update has been installed. Outlook Express 5.5 Service Pack 2 opens HTML e-mail messages in the Restricted sites zone if Microsoft Security Bulletin MS04-018 has been installed.\r\n\u2022\t\r\n\r\nBy default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates this vulnerability. See the FAQ section of this security update for more information about Internet Explorer Enhanced Security Configuration.\r\nTop of sectionTop of section\r\n\t\r\nWorkarounds for CSS Memory Corruption Vulnerability - CVE-2006-3451:\r\n\r\nMicrosoft has tested the following workarounds. Although these workarounds will not correct the underlying vulnerability, they help block known attack vectors. When a workaround reduces functionality, it is identified in the following section.\r\n\u2022\t\r\n\r\nConfigure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone\r\n\r\nYou can help protect against this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Internet Options on the Tools menu.\r\n\r\n2.\r\n\t\r\n\r\nClick the Security tab.\r\n\r\n3.\r\n\t\r\n\r\nClick Internet, and then click Custom Level.\r\n\r\n4.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n5.\r\n\t\r\n\r\nClick Local intranet, and then click Custom Level.\r\n\r\n6.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n7.\r\n\t\r\n\r\nClick OK two times to return to Internet Explorer.\r\n\r\nNote Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.\r\n\r\nImpact of Workaround: There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nSet Internet and Local intranet security zone settings to \u201cHigh\u201d to prompt before running ActiveX Controls and Active Scripting in these zones\r\n\r\nYou can help protect against this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls and Active Scripting. You can do this by setting your browser security to High.\r\n\r\nTo raise the browsing security level in Microsoft Internet Explorer, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nOn the Internet Explorer Tools menu, click Internet Options.\r\n\r\n2.\r\n\t\r\n\r\nIn the Internet Options dialog box, click the Security tab, and then click the Internet icon.\r\n\r\n3.\r\n\t\r\n\r\nUnder Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.\r\n\r\nNote If no slider is visible, click Default Level, and then move the slider to High.\r\n\r\nNote Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.\r\n\r\nImpact of Workaround: There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nRead e-mail messages in plain text format if you are using Outlook 2002 or a later version, or Outlook Express 6 SP1 or a later version, to help protect yourself from the HTML e-mail attack vector.\r\n\r\nMicrosoft Outlook 2002 users who have applied Office XP Service Pack 1 or a later version and Microsoft Outlook Express 6 users who have applied Internet Explorer 6 Service Pack 1 or a later version can enable this setting and view e-mail messages that are not digitally signed or e-mail messages that are not encrypted in plain text only.\r\n\r\nDigitally signed e-mail messages or encrypted e-mail messages are not affected by the setting and may be read in their original formats. For more information about how to enable this setting in Outlook 2002, see Microsoft Knowledge Base Article 307594.\r\n\r\nFor information about this setting in Outlook Express 6, see Microsoft Knowledge Base Article 291387.\r\n\r\nImpact of Workaround: E-mail messages that are viewed in plain text format will not contain pictures, specialized fonts, animations, or other rich content. Additionally:\r\n\u2022\t\r\n\r\nThe changes are applied to the preview pane and to open messages.\r\n\u2022\t\r\n\r\nPictures become attachments so that they are not lost.\r\n\u2022\t\r\n\r\nBecause the message is still in Rich Text or HTML format in the store, the object model (custom code solutions) may behave unexpectedly.\r\nTop of sectionTop of section\r\n\t\r\nFAQ for CSS Memory Corruption Vulnerability - CVE-2006-3451:\r\n\r\nWhat is the scope of the vulnerability?\r\nThis is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could remotely take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.\r\n\r\nWhat causes the vulnerability?\r\nWhen Internet Explorer handles chained Cascading Style Sheets (CSS) it may corrupt system memory in such a way that an attacker could execute arbitrary code.\r\n\r\nWhat might an attacker use the vulnerability to do?\r\nAn attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\r\n\r\nHow could an attacker exploit the vulnerability?\r\nAn attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site. This can also include Web sites that accept user-provided content or advertisements, Web sites that host user-provided content or advertisements, and compromised Web sites. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger request that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.\r\n\r\nWhat systems are primarily at risk from the vulnerability?\r\nThis vulnerability requires a user to be logged on and visiting a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.\r\n\r\nWhat does the update do?\r\nThe update removes the vulnerability by modifying the way that Internet Explorer handles chained Cascading Style Sheets.\r\n\r\nWhen this security bulletin was issued, had this vulnerability been publicly disclosed?\r\nNo. Microsoft received information about this vulnerability through responsible disclosure.\r\n\r\nWhen this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?\r\nNo. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.\r\nTop of sectionTop of section\r\nTop of sectionTop of section\r\n\t\r\nHTML Rendering Memory Corruption Vulnerability - CVE-2006-3637:\r\n\r\nA remote code execution vulnerability exists in the way Internet Explorer interprets HTML with certain layout combinations. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.\r\n\t\r\nMitigating Factors for HTML Rendering Memory Corruption Vulnerability - CVE-2006-3637:\r\n\u2022\t\r\n\r\nIn a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or instant messenger message that takes users to the attacker's Web site.\r\n\u2022\t\r\n\r\nAn attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\r\n\u2022\t\r\n\r\nThe Restricted sites zone helps reduce attacks that could try to exploit this vulnerability by preventing Active Scripting from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, they could still be vulnerable to this issue through the Web-based attack scenario.\r\n\r\nBy default, Outlook Express 6, Outlook 2002, and Outlook 2003 open HTML e-mail messages in the Restricted sites zone. Additionally Outlook 2000 opens HTML e-mail messages in the Restricted sites zone if the Outlook E-mail Security Update has been installed. Outlook Express 5.5 Service Pack 2 opens HTML e-mail messages in the Restricted sites zone if Microsoft Security Bulletin MS04-018 has been installed.\r\n\u2022\t\r\n\r\nBy default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates this vulnerability. See the FAQ section of this security update for more information about Internet Explorer Enhanced Security Configuration.\r\nTop of sectionTop of section\r\n\t\r\nWorkarounds for HTML Rendering Memory Corruption Vulnerability - CVE-2006-3637:\r\n\r\nMicrosoft has tested the following workarounds. Although these workarounds will not correct the underlying vulnerability, they help block known attack vectors. When a workaround reduces functionality, it is identified in the following section.\r\n\u2022\t\r\n\r\nConfigure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone\r\n\r\nYou can help protect against this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Internet Options on the Tools menu.\r\n\r\n2.\r\n\t\r\n\r\nClick the Security tab.\r\n\r\n3.\r\n\t\r\n\r\nClick Internet, and then click Custom Level.\r\n\r\n4.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n5.\r\n\t\r\n\r\nClick Local intranet, and then click Custom Level.\r\n\r\n6.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n7.\r\n\t\r\n\r\nClick OK two times to return to Internet Explorer.\r\n\r\nNote Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.\r\n\r\nImpact of Workaround: There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nSet Internet and Local intranet security zone settings to \u201cHigh\u201d to prompt before running ActiveX Controls and Active Scripting in these zones\r\n\r\nYou can help protect against this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls and Active Scripting. You can do this by setting your browser security to High.\r\n\r\nTo raise the browsing security level in Microsoft Internet Explorer, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nOn the Internet Explorer Tools menu, click Internet Options.\r\n\r\n2.\r\n\t\r\n\r\nIn the Internet Options dialog box, click the Security tab, and then click the Internet icon.\r\n\r\n3.\r\n\t\r\n\r\nUnder Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.\r\n\r\nNote If no slider is visible, click Default Level, and then move the slider to High.\r\n\r\nNote Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.\r\n\r\nImpact of Workaround: There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\nTop of sectionTop of section\r\n\t\r\nFAQ for HTML Rendering Memory Corruption Vulnerability - CVE-2006-3637:\r\n\r\nWhat is the scope of the vulnerability?\r\nThis is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could remotely take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.\r\n\r\nWhat causes the vulnerability?\r\nWhen Internet Explorer handles certain layout positioning combinations it may corrupt system memory in such a way that an attacker could execute arbitrary code.\r\n\r\nWhat might an attacker use the vulnerability to do?\r\nAn attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\r\n\r\nHow could an attacker exploit the vulnerability?\r\nAn attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site. This can also include Web sites that accept user-provided content or advertisements, Web sites that host user-provided content or advertisements, and compromised Web sites. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger request that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.\r\n\r\nWhat systems are primarily at risk from the vulnerability?\r\nThis vulnerability requires a user to be logged on and visiting a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.\r\n\r\nWhat does the update do?\r\nThe update removes the vulnerability by modifying the way that Internet Explorer handles the HTML resulting in the exploitable condition.\r\n\r\nWhen this security bulletin was issued, had this vulnerability been publicly disclosed?\r\nYes. This vulnerability has been publicly disclosed. It has been assigned Common Vulnerability and Exposure number CVE-2006-3637.\r\n\r\nWhen this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?\r\nNo. Microsoft had seen examples of proof of concept code published publicly but had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.\r\n\r\nDoes applying this security update help protect customers from the code that has been published publicly that attempts to exploit this vulnerability?\r\nYes. This security update addresses the vulnerability that potentially could be exploited by using the published proof of concept code. The vulnerability that has been addressed has been assigned the Common Vulnerability and Exposure number CVE-2006-3637.\r\nTop of sectionTop of section\r\nTop of sectionTop of section\r\n\t\r\nCOM Object Instantiation Memory Corruption Vulnerability - CVE-2006-3638:\r\n\r\nA remote code execution vulnerability exists in the way Internet Explorer instantiates COM objects that are not intended to be instantiated in Internet Explorer. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.\r\n\t\r\nMitigating Factors for COM Object Instantiation Memory Corruption Vulnerability - CVE-2006-3638:\r\n\u2022\t\r\n\r\nIn a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or instant messenger message that takes users to the attacker's Web site.\r\n\u2022\t\r\n\r\nAn attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\r\n\u2022\t\r\n\r\nThe Restricted sites zone helps reduce attacks that could try to exploit this vulnerability by preventing ActiveX Controls from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, they could still be vulnerable to this issue through the Web-based attack scenario.\r\n\r\nBy default, Outlook Express 6, Outlook 2002, and Outlook 2003 open HTML e-mail messages in the Restricted sites zone. Additionally Outlook 2000 opens HTML e-mail messages in the Restricted sites zone if the Outlook E-mail Security Update has been installed. Outlook Express 5.5 Service Pack 2 opens HTML e-mail messages in the Restricted sites zone if Microsoft Security Bulletin MS04-018 has been installed.\r\n\u2022\t\r\n\r\nBy default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates this vulnerability. See the FAQ section for this security update for more information about Internet Explorer Enhanced Security Configuration.\r\nTop of sectionTop of section\r\n\t\r\nWorkarounds for COM Object Instantiation Memory Corruption Vulnerability - CVE-2006-3638:\r\n\r\nMicrosoft has tested the following workarounds. While these workarounds will not correct the underlying vulnerability, they help block known attack vectors. When a workaround reduces functionality, it is identified in the following section.\r\n\u2022\t\r\n\r\nConfigure Internet Explorer to prompt before running ActiveX Controls or disable ActiveX Controls in the Internet and Local intranet security zone\r\n\r\nYou can help protect against this vulnerability by changing your Internet Explorer settings to prompt before running ActiveX controls. To do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Internet Options on the Tools menu.\r\n\r\n2.\r\n\t\r\n\r\nClick the Security tab.\r\n\r\n3.\r\n\t\r\n\r\nClick Internet, and then click Custom Level.\r\n\r\n4.\r\n\t\r\n\r\nUnder Settings, in the ActiveX controls and plug-ins section, under Run ActiveX controls and plug-ins, click Prompt or Disable, and then click OK.\r\n\r\n5.\r\n\t\r\n\r\nClick Local intranet, and then click Custom Level.\r\n\r\n6.\r\n\t\r\n\r\nUnder Settings, in the ActiveX controls and plug-ins section, under Run ActiveX controls and plug-ins, click Prompt or Disable, and then click OK.\r\n\r\n7.\r\n\t\r\n\r\nClick OK two times to return to Internet Explorer.\r\n\r\nImpact of Workaround: There are side effects to prompting before running ActiveX controls. Many Web sites that are on the Internet or on an intranet use ActiveX to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX controls is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX controls. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nSet Internet and Local intranet security zone settings to \u201cHigh\u201d to prompt before running ActiveX Controls and Active Scripting in these zones\r\n\r\nYou can help protect against this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls. You can do this by setting your browser security to High.\r\n\r\nTo raise the browsing security level in Microsoft Internet Explorer, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nOn the Internet Explorer Tools menu, click Internet Options.\r\n\r\n2.\r\n\t\r\n\r\nIn the Internet Options dialog box, click the Security tab, and then click the Internet icon.\r\n\r\n3.\r\n\t\r\n\r\nUnder Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.\r\n\r\nNote If no slider is visible, click Default Level, and then move the slider to High.\r\n\r\nNote Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.\r\n\r\nImpact of Workaround: There are side effects to prompting before running ActiveX controls. Many Web sites that are on the Internet or on an intranet use ActiveX to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX controls is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX controls. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nPrevent COM objects from running in Internet Explorer\r\n\r\nYou can disable attempts to instantiate a COM object in Internet Explorer by setting the kill bit for the control in the registry.\r\n\r\nWarning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.\r\n\r\nFor detailed steps that you can use to prevent a control from running in Internet Explorer, see Microsoft Knowledge Base Article 240797. Follow these steps in this article to create a Compatibility Flags value in the registry to prevent a COM object from being instantiated in Internet Explorer.\r\n\r\nTo set the kill bit for a CLSID with a value of {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}, paste the following text in a text editor such as Notepad. Then, save the file by using the .reg file name extension.\r\n\r\nWindows Registry Editor Version 5.00\r\n\r\n[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{ XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX }]\r\n"Compatibility Flags"=dword:00000400\r\n\r\nYou can apply this .reg file to individual systems by double-clicking it. You can also apply it across domains by using Group Policy. For more information about Group Policy, visit the following Microsoft Web sites:\r\n\r\nGroup Policy collection\r\n\r\nWhat is Group Policy Object Editor?\r\n\r\nCore Group Policy tools and settings\r\n\r\nNote You must restart Internet Explorer for your changes to take effect.\r\n\r\nImpact of Workaround: There is no impact as long as the COM object is not intended to be used in Internet Explorer.\r\nTop of sectionTop of section\r\n\t\r\nFAQ for COM Object Instantiation Memory Corruption Vulnerability - CVE-2006-3638:\r\n\r\nWhat is the scope of the vulnerability?\r\nThis is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could remotely take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.\r\n\r\nWhat causes the vulnerability?\r\nWhen Internet Explorer tries to instantiate certain COM objects as ActiveX Controls, the COM objects may corrupt the system state in such a way that an attacker could execute arbitrary code.\r\n\r\nWhat might an attacker use the vulnerability to do?\r\nAn attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\r\n\r\nHow could an attacker exploit the vulnerability?\r\nAn attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site. This can also include Web sites that accept user-provided content or advertisements, Web sites that host user-provided content or advertisements, and compromised Web sites. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger request that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.\r\n\r\nWhat systems are primarily at risk from the vulnerability?\r\nThis vulnerability requires that a user is logged on and visits a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.\r\n\r\nWhat does the update do?\r\nBecause not all COM objects are designed to be accessed through Internet Explorer, this update sets the kill bit for a list of Class Identifiers (CLSIDs) for COM objects that have been found to exhibit similar behavior to the COM object Instantiation Memory Corruption Vulnerability that is addressed in Microsoft Security Bulletin MS05-054. To help protect customers, this update prevents these CLSIDs from being instantiated in Internet Explorer. For more information about kill bits, see Microsoft Knowledge Base Article 240797.\r\n\r\nThe Class Identifiers and corresponding files where the COM objects are contained are as follows.\r\n\r\nClass Identifier\r\n\t\r\n\r\nFile\r\n\r\n5DFB2651-9668-11D0-B17B-00C04FC2A0CA\r\n\t\r\n\r\nDanim.dll\r\n\r\n39A2C2A6-4778-11D2-9BDB-204C4F4F5020\r\n\t\r\n\r\nMsdxm.ocx\r\n\r\n3DA2AA3E-3D96-11D2-9BD2-204C4F4F5020\r\n\t\r\n\r\nMsdxm.ocx\r\n\r\nE8C31D11-6FD2-4659-AD75-155FA143F42B\r\n\t\r\n\r\nWmm2ae.dll\r\n\r\n44C79591-D0DE-49C4-BA3C-A45AB7003356\r\n\t\r\n\r\nWmm2ae.dll\r\n\r\n01002B17-5D93-4551-81E4-831FEF780A53\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n1B544C24-FD0B-11CE-8C63-00AA0044B520\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n1CB1623E-BBEC-4E8D-B2DF-DC08C6F4627C\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n2D20D4BB-B47E-4FB7-83BD-E3C2EE250D26\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n2EA10031-0033-450E-8072-E27D9E768142\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n31087270-D348-432C-899E-2D2F38FF29A0\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n41D2B841-7692-4C83-AFD3-F60E845341AF\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n4D4C9FEF-ED80-47EA-A3FA-3215FDBB33AB\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n4F3E50BD-A9D7-4721-B0E1-00CB42A0A747\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n586FB486-5560-4FF3-96DF-1118C96AF456\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n5B4B05EB-1F63-446B-AAD1-E10A34D650E0\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n679E132F-561B-42F8-846C-A70DBDC62999\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n6C68955E-F965-4249-8E18-F0977B1D2899\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n7F1232EE-44D7-4494-AB8B-CC61B10E21A5\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n92883667-E95C-443D-AC96-4CACA27BEB6E\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n930FD02C-BBE7-4EB9-91CF-FC45CC91E3E6\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nA2EDA89A-0966-4B91-9C18-AB69F098187F\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nAECF5D2E-7A18-4DD2-BDCD-29B6F615B448\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nBC0D69A8-0923-4EEE-9375-9239F5A38B92\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nC0D076C5-E4C6-4561-8BF4-80DA8DB819D7\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nC44C65C7-FDF1-453D-89A5-BCC28F5D69F9\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nC6CB1FE3-B05E-4F0E-818F-C83ED5A0332F\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nC8F209F8-480E-454C-94A4-5392D88EBA0F\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nCC45B0B0-72D8-4652-AE5F-5E3E266BE7ED\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nCFFB1FC7-270D-4986-B299-FECF3F0E42DB\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nE188F7A3-A04E-413E-99D1-D79A45F70305\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nE476CBFF-E229-4524-B6B7-228A3129D1C7\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nEF105BC3-C064-45F1-AD53-6D8A8578D01B\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nEFEE43D6-BFE5-44B0-8063-AC3B2966AB2C\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\nF44BB2D0-F070-463E-9433-B0CCF3CFD627\r\n\t\r\n\r\nWmm2filt.dll\r\n\r\n5A20FD6F-F8FE-4a22-9EE7-307D72D09E6E\r\n\t\r\n\r\nWmm2fxa.dll \r\n\r\nADEADEB8-E54B-11d1-9A72-0000F875EADE\r\n\t\r\n\r\nWmm2fxa.dll \r\n\r\nEC85D8F1-1C4E-46e4-A748-7AA04E7C0496\r\n\t\r\n\r\nWmm2fxa.dll \r\n\r\nA2D4529E-84E0-4550-A2E0-C25D7C5CC0D0\r\n\t\r\n\r\nWmm2fxa.dll \r\n\r\nE673DCF2-C316-4c6f-AA96-4E4DC6DC291E\r\n\t\r\n\r\nWmm2fxb.dll \r\n\r\nD74CA70F-2236-4BA8-A297-4B2A28C2363C\r\n\t\r\n\r\nWmm2fxb.dll \r\n\r\nWhen this security bulletin was issued, had this vulnerability been publicly disclosed?\r\nNo. Microsoft received information about this vulnerability through responsible disclosure.\r\n\r\nWhen this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?\r\nNo. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.\r\nTop of sectionTop of section\r\nTop of sectionTop of section\r\n\t\r\nSource Element Cross-Domain Vulnerability - CVE-2006-3639:\r\n\r\nA remote code execution and information disclosure vulnerability exists in Internet Explorer in the way that a redirect is handled. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could allow for information disclosure if a user viewed the Web page. An attacker who successfully exploited this vulnerability could read file data from a Web page in another Internet Explorer domain.\r\n\r\nOn Windows 2000 Service Pack 4 and Windows XP Service Pack 1 an attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.\r\n\t\r\nMitigating Factors for Source Element Cross-Domain Vulnerability - CVE-2006-3639:\r\n\u2022\t\r\n\r\nIn a Web-based attack scenario, an attacker would have to host a Web site that contains a Web page that is used to exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to persuade them to visit the Web site, typically by getting them to click a link that takes them to the attacker's Web site.\r\n\u2022\t\r\n\r\nThe Restricted sites zone helps reduce attacks that could try to exploit this vulnerability by preventing Active Scripting from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, they could still be vulnerable to this issue through the Web-based attack scenario.\r\n\r\nBy default, Outlook Express 6, Outlook 2002, and Outlook 2003 open HTML e-mail messages in the Restricted sites zone. Additionally Outlook 2000 opens HTML e-mail messages in the Restricted sites zone if the Outlook E-mail Security Update has been installed. Outlook Express 5.5 Service Pack 2 opens HTML e-mail messages in the Restricted sites zone if Microsoft Security Bulletin MS04-018 has been installed.\r\n\u2022\t\r\n\r\nBy default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates this vulnerability See the FAQ section of this security update for more information about Internet Explorer Enhanced Security Configuration.\r\nTop of sectionTop of section\r\n\t\r\nWorkarounds for Source Element Cross-Domain Vulnerability - CVE-2006-3639:\r\n\r\nMicrosoft has tested the following workarounds. While these workarounds will not correct the underlying vulnerability, they help block known attack vectors. When a workaround reduces functionality, it is identified in the following section.\r\n\u2022\t\r\n\r\nConfigure Internet Explorer to prompt before running Active Scripting or disable Active Scripting in the Internet and Local intranet security zone\r\n\r\nYou can help protect against this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Internet Options on the Tools menu.\r\n\r\n2.\r\n\t\r\n\r\nClick the Security tab.\r\n\r\n3.\r\n\t\r\n\r\nClick Internet, and then click Custom Level.\r\n\r\n4.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n5.\r\n\t\r\n\r\nClick Local intranet, and then click Custom Level.\r\n\r\n6.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n7.\r\n\t\r\n\r\nClick OK two times to return to Internet Explorer.\r\n\r\nNote Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.\r\n\r\nImpact of Workaround: There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nSet Internet and Local intranet security zone settings to \u201cHigh\u201d to prompt before running ActiveX Controls and Active Scripting in these zones\r\n\r\nYou can help protect against this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls. You can do this by setting your browser security to High.\r\n\r\nTo raise the browsing security level in Microsoft Internet Explorer, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nOn the Internet Explorer Tools menu, click Internet Options.\r\n\r\n2.\r\n\t\r\n\r\nIn the Internet Options dialog box, click the Security tab, and then click the Internet icon.\r\n\r\n3.\r\n\t\r\n\r\nUnder Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.\r\n\r\nNote If no slider is visible, click Default Level, and then move the slider to High.\r\n\r\nNote Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.\r\n\r\nImpact of Workaround: There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\nTop of sectionTop of section\r\n\t\r\nFAQ for Source Element Cross-Domain Vulnerability - CVE-2006-3639:\r\n\r\nWhat is the scope of the vulnerability?\r\nThis is remote code execution and information disclosure vulnerability. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could allow for information disclosure if a user viewed the Web page. An attacker who successfully exploited this vulnerability could read data from a Web page in another Internet Explorer domain.\r\n\r\nOn Windows 2000 Service Pack 4 and Windows XP Service Pack 1 an attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.\r\n\r\nWhat causes the vulnerability?\r\nInternet Explorer incorrectly interprets the origin of script and allows this script to run in a domain or Internet Explorer zone other than where it originates from.\r\n\r\nWhat might an attacker use the vulnerability to do?\r\nAn attacker who successfully exploited this vulnerability could, on Windows XP Service Pack 1 and Windows 2000 Service Pack 4, execute code in the context of the user.\r\n\r\nAn attacker who successfully exploited this vulnerability could, on Windows XP Service Pack 2, read data from another security zone or domain in Internet Explorer.\r\n\r\nAn attacker could only exploit this vulnerability on Windows Server 2003 to read data from another security zone or domain in Internet Explorer if the Internet Explorer Enhanced Security Configuration has been disabled.\r\n\r\nWhat are Internet Explorer security zones?\r\nInternet Explorer security zones are part of a system that divides online content into categories or zones, based on the trustworthiness of the content. Specific Web domains can be assigned to a zone, depending on how much trust is put in the content of each domain. The zone then restricts the capabilities of the Web content, based on the zone's policy. By default, most Internet domains are treated as part of the Internet zone. By default, the policy of the Internet zone prevents scripts and other active code from accessing resources on the local system.\r\n\r\nHow could an attacker exploit the vulnerability?\r\nAn attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site. This can also include Web sites that accept user-provided content or advertisements, Web sites that host user-provided content or advertisements, and compromised Web sites. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger request that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.\r\n\r\nWhat systems are primarily at risk from the vulnerability?\r\nThis vulnerability requires a user to be logged on and visiting a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.\r\n\r\nWhat does the update do?\r\nThe update removes the vulnerability by changing Internet Explorer so that it correctly identifies the domain from which the script originated.\r\n\r\nWhen this security bulletin was issued, had this vulnerability been publicly disclosed?\r\nNo. Microsoft received information about this vulnerability through responsible disclosure.\r\n\r\nWhen this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?\r\nNo. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.\r\nTop of sectionTop of section\r\nTop of sectionTop of section\r\n\t\r\nWindow Location Information Disclosure Vulnerability - CVE-2006-3640:\r\n\r\nAn information disclosure vulnerability exists in Internet Explorer where script can be persisted across navigations and used to gain access to the location of a Window in another domain or Internet Explorer zone. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could allow for information disclosure if a user viewed the Web page. An attacker who successfully exploited this vulnerability could gain access to the Window location of a Web page in another domain or Internet Explorer zone.\r\n\t\r\nMitigating Factors for Window Location Information Disclosure Vulnerability - CVE-2006-3640:\r\n\u2022\t\r\n\r\nIn a Web-based attack scenario, an attacker would have to host a Web site that contains a Web page that is used to exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to persuade them to visit the Web site, typically by getting them to click a link that takes them to the attacker's Web site.\r\n\u2022\t\r\n\r\nThe Restricted sites zone helps reduce attacks that could try to exploit this vulnerability by preventing Active Scripting from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, they could still be vulnerable to this issue through the Web-based attack scenario.\r\n\r\nBy default, Outlook Express 6, Outlook 2002, and Outlook 2003 open HTML e-mail messages in the Restricted sites zone. Additionally Outlook 2000 opens HTML e-mail messages in the Restricted sites zone if the Outlook E-mail Security Update has been installed. Outlook Express 5.5 Service Pack 2 opens HTML e-mail messages in the Restricted sites zone if Microsoft Security Bulletin MS04-018 has been installed.\r\n\u2022\t\r\n\r\nBy default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates this vulnerability. See the FAQ section of this security update for more information about Internet Explorer Enhanced Security Configuration.\r\nTop of sectionTop of section\r\n\t\r\nWorkarounds for Window Location Information Disclosure Vulnerability - CVE-2006-3640:\r\n\r\nMicrosoft has tested the following workarounds. While these workarounds will not correct the underlying vulnerability, they help block known attack vectors. When a workaround reduces functionality, it is identified in the following section.\r\n\u2022\t\r\n\r\nConfigure Internet Explorer to prompt before running Active Scripting or disable Active Scripting in the Internet and Local intranet security zone\r\n\r\nYou can help protect against this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Internet Options on the Tools menu.\r\n\r\n2.\r\n\t\r\n\r\nClick the Security tab.\r\n\r\n3.\r\n\t\r\n\r\nClick Internet, and then click Custom Level.\r\n\r\n4.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n5.\r\n\t\r\n\r\nClick Local intranet, and then click Custom Level.\r\n\r\n6.\r\n\t\r\n\r\nUnder Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.\r\n\r\n7.\r\n\t\r\n\r\nClick OK two times to return to Internet Explorer.\r\n\r\nNote Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.\r\n\r\nImpact of Workaround: There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\n\u2022\t\r\n\r\nSet Internet and Local intranet security zone settings to \u201cHigh\u201d to prompt before running ActiveX Controls and Active Scripting in these zones\r\n\r\nYou can help protect against this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls. You can do this by setting your browser security to High.\r\n\r\nTo raise the browsing security level in Microsoft Internet Explorer, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nOn the Internet Explorer Tools menu, click Internet Options.\r\n\r\n2.\r\n\t\r\n\r\nIn the Internet Options dialog box, click the Security tab, and then click the Internet icon.\r\n\r\n3.\r\n\t\r\n\r\nUnder Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.\r\n\r\nNote If no slider is visible, click Default Level, and then move the slider to High.\r\n\r\nNote Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.\r\n\r\nImpact of Workaround: There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone\u201d.\r\n\r\nAdd sites that you trust to the Internet Explorer Trusted sites zone.\r\n\r\nAfter you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.\r\n\r\nTo do this, follow these steps:\r\n\r\n1.\r\n\t\r\n\r\nIn Internet Explorer, click Tools, click Internet Options, and then click the Security tab.\r\n\r\n2.\r\n\t\r\n\r\nIn the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.\r\n\r\n3.\r\n\t\r\n\r\nIf you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.\r\n\r\n4.\r\n\t\r\n\r\nIn the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.\r\n\r\n5.\r\n\t\r\n\r\nRepeat these steps for each site that you want to add to the zone.\r\n\r\n6.\r\n\t\r\n\r\nClick OK two times to accept the changes and return to Internet Explorer.\r\n\r\nNote Add any sites that you trust not to take malicious action on your computer. Two in particular that you may want to add are "*.windowsupdate.microsoft.com" and \u201c*.update.microsoft.com\u201d (without the quotation marks). These are the sites that will host the update, and it requires an ActiveX Control to install the update.\r\nTop of sectionTop of section\r\n\t\r\nFAQ for Window Location Information Disclosure Vulnerability - CVE-2006-3640:\r\n\r\nWhat is the scope of the vulnerability?\r\nThis is an information disclosure vulnerability. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could allow for information disclosure if a user viewed the Web page. An attacker who successfully exploited this vulnerability could gain access to the window location of a Web page in another Internet Explorer domain.\r\n\r\nWhat causes the vulnerability?\r\nIt is possible to persist script across navigations and then use this script to gain access to the window location of a Web page in another domain or Internet Explorer zone.\r\n\r\nWhat might an attacker use the vulnerability to do?\r\nAn attacker who successfully exploited this vulnerability could gain access to the location of a Web page in another domain or Internet Explorer zone. After a user visits a Web site containing the exploit the attacker can see the location of subsequent Web pages visited in the same Internet Explorer session.\r\n\r\nWhat are Internet Explorer security zones?\r\nInternet Explorer security zones are part of a system that divides online content into categories or zones, based on the trustworthiness of the content. Specific Web domains can be assigned to a zone, depending on how much trust is put in the content of each domain. The zone then restricts the capabilities of the Web content, based on the zone's policy. By default, most Internet domains are treated as part of the Internet zone. By default, the policy of the Internet zone prevents scripts and other active code from accessing resources on the local system.\r\n\r\nHow could an attacker exploit the vulnerability?\r\nAn attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site. This can also include Web sites that accept user-provided content or advertisements, Web sites that host user-provided content or advertisements, and compromised Web sites. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger request that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.\r\n\r\nWhat systems are primarily at risk from the vulnerability?\r\nThis vulnerability requires a user to be logged on and visiting a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.\r\n\r\nWhat does the update do?\r\nThe update removes the vulnerability by enforcing cross-domain security restrictions if script persists across navigations and limiting the ability for script to persist across navigations.\r\n\r\nWhen this security bulletin was issued, had this vulnerability been publicly disclosed?\r\nNo. Microsoft received information about this vulnerability through responsible disclosure.\r\n\r\nWhen this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?\r\nNo. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.\r\nTop of sectionTop of section\r\nTop of sectionTop of section\r\n\t\r\nFTP Server Command Injection Vulnerability - CVE-2004-1166:\r\n\r\nAn elevation of privilege vulnerability exists in the way Internet Explorer handles specially crafted FTP links that contain line feeds. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow the attacker to issue FTP server commands if a user clicked on an FTP link. An attacker who successfully exploited this vulnerability could issue server commands as the user to servers.\r\n\t\r\nMitigating Factors for FTP Server Command Injection Vulnerability - CVE-2004-1166:\r\n\u2022\t\r\n\r\nAny attack would be limited to what the user could do on the visited FTP server.\r\n\u2022\t\r\n\r\nAn attacker would need to know the location of the FTP server.\r\n\u2022\t\r\n\r\nUser interaction is required to exploit this vulnerability.\r\n\u2022\t\r\n\r\nIn a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or instant messenger message that takes users to the attacker's Web site.\r\n\u2022\t\r\n\r\nThe Restricted sites zone helps reduce attacks that could try to exploit this vulnerability by preventing Active Scripting from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, the user could still be vulnerable to this issue through the Web-based attack scenario.\r\n\r\nBy default, Outlook Express 6, Outlook 2002, and Outlook 2003 open HTML e-mail messages in the Restricted sites zone. Additionally Outlook 2000 opens HTML e-mail messages in the Restricted sites zone if the Outlook E-mail Security Update has been installed. Outlook Express 5.5 Service Pack 2 opens HTML e-mail messages in the Restricted sites zone if Microsoft Security Bulletin MS04-018 has been installed.\r\n\u2022\t\r\n\r\nBy default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates this vulnerability in the e-mail vector because reading e-mail messages in plain text is the default configuration for Outlook Express. See the FAQ section of this security update for more information about Internet Explorer Enhanced Security Configuration.\r\nTop of sectionTop of section\r\n\t\r\nWorkarounds for FTP Server Command Injection Vulnerability - CVE-2004-1166:\r\n\r\nMicrosoft has tested the following workarounds. Although these workarounds will not correct the underlying vulnerability, they help block known attack vectors. When a workaround reduces functionality, it is identified in the following section.\r\n\u2022\t\r\n\r\nRead e-mail messages in plain text format if you are using Outlook 2002 or a later version, or Outlook Express 6 SP1 or a later version, to help protect yourself from the HTML e-mail attack vector.\r\n\r\nMicrosoft Outlook 2002 users who have applied Office XP Service Pack 1 or a later version and Microsoft Outlook Express 6 users who have applied Internet Explorer 6 Service Pack 1 or a later version can enable this setting and view e-mail messages that are not digitally signed or e-mail messages that are not encrypted in plain text only.\r\n\r\nDigitally signed e-mail messages or encrypted e-mail messages are not affected by the setting and may be read in their original formats. For more information about how to enable this setting in Outlook 2002, see Microsoft Knowledge Base Article 307594.\r\n\r\nFor information about this setting in Outlook Express 6, see Microsoft Knowledge Base Article 291387.\r\n\r\nImpact of Workaround: E-mail messages that are viewed in plain text format will not contain pictures, specialized fonts, animations, or other rich content. Additionally:\r\n\u2022\t\r\n\r\nThe changes are applied to the preview pane and to open messages.\r\n\u2022\t\r\n\r\nPictures become attachments so that they are not lost.\r\n\u2022\t\r\n\r\nBecause the message is still in Rich Text or HTML format in the store, the object model (custom code solutions) may behave unexpectedly.\r\nTop of sectionTop of section\r\n\t\r\nFAQ for FTP Server Command Injection Vulnerability - CVE-2004-1166:\r\n\r\nWhat is the scope of the vulnerability?\r\nThis is an elevation of privilege vulnerability. An attacker who successfully exploited this vulnerability could issue FTP server commands as the user to FTP servers. The attacker would be limited by what the user could do on the FTP server. An attacker would need to know the location of the FTP server. User interaction is required to exploit this vulnerability.\r\n\r\nWhat causes the vulnerability?\r\nWhen Internet Explorer handles specially crafted FTP links that contain line feeds, it passes the line feeds on to the server. The server may then interpret the substrings between the line feeds as additional commands.\r\n\r\nWhat might an attacker use the vulnerability to do?\r\nAn attacker who successfully exploited this vulnerability could issue FTP server commands as the user to FTP servers. The attacker would be limited by what the user could do on the FTP server.\r\n\r\nHow could an attacker exploit the vulnerability?\r\nAn attacker could host a specially crafted Web site or HTML e-mail message that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site or HTML e-mail message. This can also include Web sites that accept user-provided content or advertisements, Web sites that host user-provided content or advertisements, and compromised Web sites. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger request that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.\r\n\r\nWhat systems are primarily at risk from the vulnerability?\r\nThis vulnerability requires that a user click on an FTP link for any malicious action to occur. Therefore, any systems where HTML e-mail messages are read or where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.\r\n\r\nWhat does the update do?\r\nThe update removes the vulnerability by modifying the FTP client in Internet Explorer so that ASCII control characters, like a line feed character, and everything after ASCII control characters are ignored in FTP links.\r\n\r\nWhen this security bulletin was issued, had this vulnerability been publicly disclosed?\r\nYes. This vulnerability has been publicly disclosed. It has been assigned Common Vulnerability and Exposure number CVE-2004-1166.\r\n\r\nWhen this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?\r\nNo. Microsoft had seen examples of proof of concept code published publicly but had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.\r\n\r\nDoes applying this security update help protect customers from the code that has been published publicly that attempts to exploit this vulnerability?\r\nYes. This security update addresses the vulnerability that potentially could be exploited by using the published proof of concept code. The vulnerability that has been addressed has been assigned the Common Vulnerability and Exposure number CVE-2004-1166.\r\n\r\nAcknowledgments\r\n\r\nMicrosoft thanks the following for working with us to help protect customers:\r\n\u2022\t\r\n\r\nSam Thomas, working with TippingPoint and the Zero Day Initiative, for reporting the HTML Layout and Positioning Memory Corruption Vulnerability (CVE-2006-3450).\r\n\u2022\t\r\n\r\nSam Thomas, working with TippingPoint and the Zero Day Initiative, for reporting the CSS Memory Corruption Vulnerability (CVE-2006-3451).\r\n\u2022\t\r\n\r\nCody Pierce of the TippingPoint Security Research Team for reporting one class identifier documented in the COM Object Instantiation Memory Corruption Vulnerability (CVE-2006-3638).\r\n\u2022\t\r\n\r\nWill Dormann of CERT/CC for reporting two class identifiers documented in the COM Object Instantiation Memory Corruption Vulnerability (CVE-2006-3638).\r\n\r\nDisclaimer:\r\n\r\nThe information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\r\n\r\nRevisions:\r\n\u2022\t\r\n\r\nV1.0 (August 8, 2006): Bulletin published.", "modified": "2006-08-08T00:00:00", "published": "2006-08-08T00:00:00", "id": "SECURITYVULNS:DOC:13791", "href": "https://vulners.com/securityvulns/SECURITYVULNS:DOC:13791", "title": "Microsoft Security Bulletin MS06-042 Cumulative Security Update for Internet Explorer (918899)", "type": "securityvulns", "cvss": {"score": 7.5, "vector": "AV:NETWORK/AC:LOW/Au:NONE/C:PARTIAL/I:PARTIAL/A:PARTIAL/"}}], "nessus": [{"lastseen": "2019-11-03T12:15:43", "bulletinFamily": "scanner", "description": "The remote host is missing IE Cumulative Security Update 918899.\n\nThe remote version of IE is vulnerable to several flaws that could\nallow an attacker to execute arbitrary code on the remote host.\n\nNote that Microsoft has re-released this hotfix since the 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