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             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0688 -- [Win]
         Vulnerability in MSN Messenger and Windows Live Messenger
                     Could Allow Remote Code Execution
                             12 September 2007

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Windows Live Messenger 8.0
                      MSN Messenger 6.2, 7.0 and 7.5
Publisher:            Microsoft
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-2931

Ref:                  ESB-2007.0651

Original Bulletin:    
  http://www.microsoft.com/technet/security/Bulletin/MS07-054.mspx

Comment: This Microsoft update fixes the vulnerability previously
         reported in AusCERT ESB-2007.0651.
         
         Example exploit code for this vulnerability has been
         widely published.

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MS07-054 - Vulnerability in MSN Messenger and Windows Live Messenger Could 
Allow Remote Code Execution (942099)

Affected Software:
   -MSN Messenger 6.2
   -MSN Messenger 7.0
   -MSN Messenger 7.5
   -Windows Live Messenger 8.0

Non-Affected Software:
   -MSN Messenger 7.0.0820
   -Windows Live Messenger 8.1

Full MS07-054 advisory:
   http://www.microsoft.com/technet/security/Bulletin/MS07-054.mspx


Vulnerability Details:
	
MSN Messenger Webcam or Video Chat Session Remote Code Execution 
Vulnerability - CVE-2007-2931

   A remote code execution vulnerability exists in MSN Messenger 6.2, MSN
   Messenger 7.0, MSN Messenger 7.5, and Windows Live Messenger 8.0. The
   vulnerability could allow remote code execution when a user chooses to
   accept a webcam or video chat invitation from an attacker. An attacker who
   successfully exploited this vulnerability could take complete control of
   the affected system. 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 vulnerability requires that a user be signed on to the MSN Messenger
   or Windows Live Messenger service and accept a webcam or video chat
   invitation for any malicious action to occur. Therefore, any system where
   MSN Messenger 6.2, MSN Messenger 7.0, MSN Messenger 7.5, or Windows Live
   Messenger 8.0 is used, such as workstations or servers, is at risk from
   this vulnerability.

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

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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