Technical Description

A vulnerability has been identified in Microsoft Windows, which could be exploited by remote attackers to cause a denial of service or potentially compromise a vulnerable system. This issue is caused by an array indexing error in the "Smb2ValidateProviderCallback()" function within the "SRV2.SYS" kernel driver when processing malformed SMB Negociate requests, which could allow remote attackers to crash an affected system or potentially execute arbitrary code by sending a specially crafted SMB packet.

Affected Products

Microsoft Windows Vista Service Pack 1
Microsoft Windows Vista Service Pack 2
Microsoft Windows Vista x64 Edition
Microsoft Windows Vista x64 Edition Service Pack 1
Microsoft Windows Vista x64 Edition Service Pack 2
Microsoft Windows Server 2008 (32-bit)
Microsoft Windows Server 2008 (32-bit) Service Pack 2
Microsoft Windows Server 2008 (x64)
Microsoft Windows Server 2008 (x64) Service Pack 2
Microsoft Windows Server 2008 (Itanium)
Microsoft Windows Server 2008 (Itanium) Service Pack 2
Microsoft Windows 7 Release Candidate

Solution

Apply patches :
http://www.microsoft.com/technet/security/bulletin/MS09-050.mspx

References

http://www.vupen.com/english/advisories/2009/2561
http://www.microsoft.com/technet/security/advisory/975497.mspx
http://g-laurent.blogspot.com/2009/09/windows-vista7-smb20-negotiate-protocol.html

Credits

Vulnerability reported by Laurent Gaffié.

ChangeLog

2009-09-08 : Initial release
2009-09-08 : Updated References
2009-10-13 : Updated Solution

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