-----BEGIN PGP SIGNED MESSAGE-----
Title: Cumulative Patch for Internet Explorer (828750) Date: October 3, 2003 Software: Internet Explorer 5.01 Internet Explorer 5.5 Internet Explorer 6.0 Internet Explorer 6.0 for Windows Server 2003 Impact: Run code of attacker's choice Max Risk: Critical Bulletin: MS03-040
Microsoft encourages customers to review the Security Bulletins at: http://www.microsoft.com/technet/security/bulletin/MS03-040.asp http://www.microsoft.com/security/security_bulletins/MS03-040.asp
This is a cumulative patch that includes the functionality of all previously released patches for Internet Explorer 5.01, 5.5 and 6.0. In addition, it eliminates the following newly discovered vulnerabilities:
A vulnerability that occurs because Internet Explorer does not properly determine an object type returned from a Web server in a popup window. It could be possible for an attacker who exploited this vulnerability to run arbitrary code on a user's system. If a user visited an attacker's Web site, it would be possible for the attacker to exploit this vulnerability without any other user action. An attacker could also craft an HTML-based e-mail that would attempt to exploit this vulnerability.
A vulnerability that occurs because Internet Explorer does not properly determine an object type returned from a Web server during XML data binding. It could be possible for an attacker who exploited this vulnerability to run arbitrary code on a user's system. If a user visited an attacker's Web site, it would be possible for the attacker to exploit this vulnerability without any other user action. An attacker could also craft an HTML-based e-mail that would attempt to exploit this vulnerability.
A change has been made to the method by which Internet Explorer handles Dynamic HTML (DHTML) Behaviors in the Internet Explorer Restricted Zone. It could be possible for an attacker exploiting a separate vulnerability (such as one of the two vulnerabilities discussed above) to cause Internet Explorer to run script code in the security context of the Internet Zone. In addition, an attacker could use Windows Media Player's (WMP) ability to open URL's to construct an attack. An attacker could also craft an HTML-based e-mail that could attempt to exploit this behavior.
To exploit these flaws, the attacker would have to create a specially formed HTML-based e-mail and send it to the user. Alternatively an attacker would have to host a malicious Web site that contained a Web page designed to exploit these vulnerabilities. The attacker would then have to persuade a user to visit that site.
As with the previous Internet Explorer cumulative patches released with bulletins MS03-004, MS03-015, MS03-020, and MS03-032, this cumulative patch will cause window.showHelp( ) to cease to function if you have not applied the HTML Help update. If you have installed the updated HTML Help control from Knowledge Base article 811630, you will still be able to use HTML Help functionality after applying this patch.
In addition to applying this security patch it is recommended that users also install the Windows Media Player update referenced in Knowledge Base Article 828026. This update is available from Windows Update as well as the Microsoft Download Center for all supported versions of Windows Media Player. While not a security patch, this update contains a change to the behavior of Windows Media Player's ability to launch URL's to help protect against DHTML behavior based attacks. Specifically, it restricts Windows Media Player's ability to launch URL's in the local computer zone from other zones.
-By default, Internet Explorer on Windows Server 2003 runs in Enhanced Security Configuration. This default configuration of Internet Explorer blocks automatic exploitation of this attack. If Internet Explorer Enhanced Security Configuration has been disabled, the protections put in place that prevent this vulnerability from being automatically exploited would be removed.
-In the Web-based attack scenario, the attacker would have to host a Web site that contained a Web page used to exploit this vulnerability. An attacker would have no way to force a user to visit a malicious Web Site. Instead, the attacker would need to lure them there, typically by getting them to click a link that would take them to the attacker's site.
-Exploiting the vulnerability would allow the attacker only the same privileges as the user. Users whose accounts are configured to have few privileges on the system would be at less risk than ones who operate with administrative privileges.
THE 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.
-----BEGIN PGP SIGNATURE----- Version: PGP 7.1
iQEVAwUBP34rCY0ZSRQxA/UrAQFmqAgAlS+ZctG+OT7Rd49WfGdz2ISdMNZ1E1ay IpWYrj5leBrc5KTLf7fadhy9209A96gppJbV6lIWqP1gvQWrWaW8XZzyhvsX7FH+ 922nYeQLUsPp3R+wA2jZP6OvcfTFOUqa4nDM9oisO7qMEc2SuDdQWont2IzeAf6h 3P6VjblfQ72pxPAYuFSRN0xKZGzqcSKqWYwy+APgjp3a+J1tO17ur+1jhz6BgI9w CZcAOxluayX6IxOixaWFBZUmiITGFImYFY1Ql+LQSdTCVv11R+IKrhAsRwfyfA9r 7AqjjZfWrB/ScpPdrobt3W9eFSxgHCjMen7SIB5SuTldsWwpu7IBHg== =vhUD -----END PGP SIGNATURE-----
You have received this e-mail bulletin because of your subscription to the Microsoft Product Security Notification Service. For more information on this service, please visit http://www.microsoft.com/technet/security/notify.asp.
To verify the digital signature on this bulletin, please download our PGP key at http://www.microsoft.com/technet/security/notify.asp.
To unsubscribe from the Microsoft Security Notification Service, please visit the Microsoft Profile Center at http://register.microsoft.com/regsys/pic.asp
If you do not wish to use Microsoft Passport, you can unsubscribe from the Microsoft Security Notification Service via email as described below: Reply to this message with the word UNSUBSCRIBE in the Subject line.
For security-related information about Microsoft products, please visit the Microsoft Security Advisor web site at http://www.microsoft.com/security.