-----BEGIN PGP SIGNED MESSAGE-----
Title: Unchecked Buffer in Windows Shell Could Enable System Compromise (329390) Date: 18 December 2002 Software: Microsoft Windows XP Impact: Run code of an attacker's choice Max Risk: Critical Bulletin: MS02-072
Microsoft encourages customers to review the Security Bulletins at: http://www.microsoft.com/technet/security/bulletin/MS02-072.asp http://www.microsoft.com/security/security_bulletins/ms02-072.asp
The Windows Shell is responsible for providing the basic framework of the Windows user interface experience. It is most familiar to users as the Windows Desktop, but also provides a variety of other functions to help define the user's computing session, including organizing files and folders, and providing the means to start applications.
An unchecked buffer exists in one of the functions used by the Windows Shell to extract custom attribute information from audio files. A security vulnerability results because it is possible for a malicious user to mount a buffer overrun attack and attempt to exploit this flaw.
An attacker could seek to exploit this vulnerability by creating an .MP3 or .WMA file that contained a corrupt custom attribute and then host it on a website, on a network share, or send it via an HTML email. If a user were to hover his or her mouse pointer over the icon for the file (either on a web page or on the local disk), or open the shared folder where the file was stored, the vulnerable code would be invoked. An HTML email could cause the vulnerable code to be invoked when a user opened or previewed the email. A successful attack could have the effect of either causing the Windows Shell to fail, or causing an attacker's code to run on the user's computer in the security context of the user.
The vulnerability lies in the Windows Shell, rather than Windows Media Player. As a result, playing an audio file with Windows Media Player would not pose any additional risk.
Outlook 98 and 2000 (after installing the Outlook Email Security Update),Outlook 2002, and Outlook Express 6 all open HTML mail in the Restricted Sites Zone. Customers who are using these products and who have also installed Windows XP Service Pack 1 or any recent security patch for Internet Explorer that disables frames in the Restricted Sites zone would not be at risk from automated email-borne attacks. However, these customers could still be attacked if they choose to click on a hyperlink in a malicious HTML email.
In the case where an attacker's code was executed, the code would run in the security context of the user. As a result, any limitations on the user's ability would also restrict the actions that an attacker's code could take.
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
iQEVAwUBPgDwqI0ZSRQxA/UrAQFfkAf/fqPzXK8/xx4lroE9OW5FrcJ3t8ljtOcx jEWZbBxSxdNuBcHTsDdafIYQLpGNafl8EhwLGtUHLm9AY8O/hxrYuf5ag/6ayP7R 095icpB73J9kwbNESeR2A/DnlCXcP7yuQIfcAlA2RlbeTBXLcUarodIFzGOpVpY8 ACyYYK6GxptjsG//7blO8u7YLfSVZv/vbJsUk0Nps/lXyJdoL5hiyN7fQ0eZnqxH teQXr1t7RWLyymPNYyiYI+XLt6Y7AgO3Nog9XuXKFJ0SPV5t1/ZbrJDCRvyaFEIu +ARkFii2mPGTo5VO8ez13JHl8iiN645zKfqvM+iI5Kk8OG0DoBrZgw== =CFpx -----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.