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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2008.0095 -- AUSCERT ALERT
                                   [Win]
       MS08-054 - Vulnerability in Windows Media Player Could Allow
                           Remote Code Execution
                             10 September 2008

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        AusCERT Alert Summary
        ---------------------

Product:              Windows Media Player 11
Publisher:            Microsoft
Operating System:     Windows XP
                      Windows Vista
                      Windows Server 2008
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-2253

Original Bulletin:    
  http://www.microsoft.com/technet/security/Bulletin/ms08-054.mspx

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Microsoft Security Bulletin MS08-054 Critical

Vulnerability in Windows Media Player Could Allow Remote Code Execution 
(954154)

  Published: September 9, 2008

  Version: 1.0

General Information

Executive Summary

  This security update resolves a privately reported vulnerability in 
  Windows Media Player that could allow remote code execution when a 
  specially crafted audio file is streamed from a Windows Media server. 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 Windows Media Player 11.

  Recommendation.  Microsoft recommends that customers apply the update 
  immediately.

Affected Software

  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 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 Player Sampling Rate Vulnerability - CVE-2008-2253

  A remote code execution vulnerability exists in Windows Media Player 11. 
  An attacker could exploit the vulnerability by constructing a specially 
  crafted audio file that could allow remote code execution when streamed 
  from a Windows Media server using Windows Media Player 11. An attacker 
  who successfully exploited this vulnerability could take complete control 
  of an affected system.

Workarounds for Windows Media Player Sampling Rate Vulnerability - 
CVE-2008-2253

  Workaround refers to a setting or configuration change that does not 
  correct the underlying vulnerability but would help block known attack 
  vectors before you apply the update. Microsoft has tested the following 
  workarounds and states in the discussion whether a workaround reduces 
  functionality:

  Unregister wmpeffects.dll
  To unregister this DLL, run the following command from an elevated 
  command prompt:

  For 32-bit Windows-based systems:
  Regsvr32.exe u %WINDIR%\system32\wmpeffects.dll

  For 64-bit Windows-based systems:
  Regsvr32.exe u %WINDIR%\syswow64\wmpeffects.dll

  Impact of workaround: Visualizations will fail to display in the Now 
  Playing view of Windows Media Player.

  How to undo the workaround: Run the following command from an elevated command prompt:

  For 32-bit Windows-based systems:
  Regsvr32.exe %WINDIR%\system32\wmpeffects.dll

  For 64-bit Windows-based systems:
  Regsvr32.exe %WINDIR%\syswow64\wmpeffects.dll

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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