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             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0651 -- [Win]
   MSN Messenger and Windows Live Messenger webcam stream heap overflow
                              30 August 2007

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

Product:              MSN Messenger 7.x and prior
Publisher:            US-CERT
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-2931 CVE-2007-4579

Original Bulletin:    http://www.kb.cert.org/vuls/id/166521

Comment: There are two CVE numbers referencing the same vulnerability. For
         completeness we have added both CVE numbers.

Revision History:  August 30 2007: Added additional CVE and comment
                   August 29 2007: Initial Release

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Vulnerability Note VU#166521

MSN Messenger and Windows Live Messenger webcam stream heap overflow

Overview
MSN Messenger fails to properly handle webcam streams, which may allow a remote 
attacker to execute arbitrary code.

I. Description
MSN Messenger is an instant messaging application. Starting with version 8, 
MSN Messenger was renamed to Windows Live Messenger. Windows Live Messenger and 
some versions of MSN Messenger support the use of webcams. MSN Messenger and 
Windows Live Messenger appear to require user interaction to connect a webcam 
stream.

MSN Messenger and Windows Live Messenger contain a heap overflow in the handling 
of a malformed webcam streams. Exploit code for this vulnerability is publicly 
available.

II. Impact
By convincing a user to accept a webcam invitation, a remote attacker may be
able to execute arbitrary code with the privileges of the user.

III. Solution
Apply an update

This issue is addressed in Windows Live Messenger 8.1.

Do not accept webcam invitations

If you are unable to install Windows Live Messenger 8.1, do not accept any 
webcam invitations, regardless of the source.

Systems Affected
Vendor                   Status        Date Updated
Microsoft Corporation	Vulnerable	28-Aug-2007

References
http://secunia.com/advisories/26570/

Credit

This vulnerability was publicly reported by team509.

This document was written by Will Dormann.

Other Information
Date Public 01/31/2007
Date First Published 08/28/2007 08:54:13 AM
Date Last Updated 08/28/2007

CERT Advisory	 
CVE Name CVE-2007-2931
Metric 3.54
Document Revision 6


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