Microsoft Security Advisory 977544 Released

Today Microsoft released Security Advisory 977544 to provide information, including customer guidance, on a publicly reported Denial-of-Service (DoS) vulnerability affecting Server Messaging Block (SMB) Protocol. This vulnerability, in SMBv1 and SMBv2, affects  Windows 7 and Windows Server 2008 R2. Windows Vista, Windows Server 2008, Windows XP, Windows Server 2003 and Windows 2000 are not affected.

It needs to be made  clear that this is a DoS vulnerability that is unrelated to Microsoft Security Bulletin MS09-050 which addressed a remote code execution vulnerability in the SMBv2 protocol. This vulnerability would not allow an attacker to take control or install malware on a user’s system, but could cause the affected system to stop responding until manually restarted.

http://blogs.technet.com/msrc/archive/2009/11/13/microsoft-security-advisory-977544-released.aspx