Microsoft SMB Client Remote Code Execution Vulnerabilities (2511455)

Summary
This host is missing a critical security update according to Microsoft Bulletin MS11-019.
Impact
Successful exploitation could allow remote attacker to execute arbitrary code by creating a specially crafted browser message and sending the message to an affected system or attacker could perform a man-in-the-middle attack to respond to a legitimate SMB request with a malformed SMB response. Impact Level: System
Solution
Run Windows Update and update the listed hotfixes or download and update mentioned hotfixes in the advisory from the below link, http://www.microsoft.com/technet/security/Bulletin/MS11-019.mspx
Insight
The flaws are due to, - errors in SMB client implementation which fails to validate specially crafted SMB responses. - error in CIFS Browser Protocol implementation which fails to parse specially crafted Computer Browser messages causing memory corruption.
Affected
Micorsoft Windows 7 Service Pack 1 and prior Microsoft Windows XP Service Pack 3 and prior Microsoft Windows 2003 Service Pack 2 and prior Microsoft Windows Vista Service Pack 1/2 and prior Microsoft Windows Server 2008 Service Pack 1/2 and prior
References