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                                    CERT-Renater

                         Note d'Information No. 2008/VULN344
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DATE                      : 10/09/2008

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running Windows Media Encoder 9.

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KB954156
http://www.microsoft.com/technet/security/bulletin/ms08-053.mspx
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Microsoft Security Bulletin MS08-053 Critical Vulnerability in Windows
Media Encoder 9 Could Allow Remote Code Execution (954156)

   Published: September 9, 2008

   Version: 1.0

General Information

Executive Summary

   This security update resolves a privately reported vulnerability in
   Windows Media Encoder 9 Series. The vulnerability could allow remote
   code execution if a user viewed a specially crafted Web page. If a
   user is logged on with administrative user rights, an attacker who
   successfully exploited this vulnerability 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.

   This security update is rated Critical for all supported and affected
   editions of Microsoft Windows 2000, Windows XP, and Windows Vista, and
   Moderate for supported and affected versions of Windows Server 2003
   and Windows Server 2008.

   The security update addresses the vulnerability by performing
   additional parameter validation and modifying the way that controls in
   Windows Media Encoder interact with Internet Explorer.

   Recommendation. Microsoft recommends that customers apply the update
   immediately.

Affected Software

   Microsoft Windows 2000 Service Pack 4
   Windows XP Service Pack 2 and Windows XP Service Pack 3
   Windows XP Professional x64 Edition and Windows XP Professional x64
     Edition Service Pack 2
   Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2
   Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
     Service Pack 2
   Windows Vista and Windows Vista Service Pack 1
   Windows Vista x64 Edition and Windows Vista x64 Edition Service Pack 1
   Windows Server 2008 for 32-bit Systems*
   Windows Server 2008 for x64-based Systems*
   *Windows Server 2008 server core installation not affected.

Vulnerability Information

Windows Media Encoder Buffer Overrun Vulnerability - CVE-2008-3008

   A remote code execution vulnerability exists in the WMEX.DLL ActiveX
   control installed by Windows Media Encoder 9 Series. The vulnerability
   could allow remote code execution if a user views a specially crafted
   Web page. If a user is logged on with administrative user rights, an
   attacker who successfully exploited this vulnerability 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.


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