Secunia

Some vulnerabilities have been reported in Microsoft Windows, which can be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.

1) An array indexing error in the srv2.sys kernel driver when processing the Process ID variable of the NEGOTIATE PROTOCOL request can be exploited to dereference out-of-bounds memory via a specially crafted SMB packet.

Successful exploitation may allow execution of arbitrary code.

2) An error in the processing of SMBv2 packets can be exploited to trigger the execution of an infinite loop and hang an affected system via a specially crafted SMBv2 packet.

3) An error when processing SMB command values can be exploited to potentially execute arbitrary code via a specially crafted SMB packet.

NOTE: Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for Itanium-based Systems are not affected by the vulnerabilities.

Solution
Apply patches.
Further details available in Customer Area

Provided and/or discovered by
1) Laurent Gaffié
2) Reported by the vendor.
3) The vendor credits Matthieu Suiche of the Netherlands Forensics Institute.

Changelog
Further details available in Customer Area

Original Advisory
Microsoft (KB975517):
http://www.microsoft.com/technet/security/Bulletin/MS09-050.mspx

Microsoft:
http://www.microsoft.com/technet/security/advisory/975497.mspx

Laurent Gaffié:
http://g-laurent.blogspot.com/2009/09/windows-vista7-smb20-negotiate-protocol.html

Deep Links
Links available in Customer Area