Microsoft has released the latest monthly security updates for October 2008 and has made them available for download from the Microsoft Download Center and also from Windows Update/Microsoft Update. The release includes an update for the Windows Malicious Software Removal Tool and the Windows Mail Definition Update (x86) (x64).

Critical:
-KB957280: Vulnerability in Active Directory Could Allow Remote Code Execution
-KB956390: Cumulative Security Update for Internet Explorer
-KB956695: Vulnerability in Host Integration Server RPC Service Could Allow Remote Code Execution
-KB956416: Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution

Important:
-KB956803: Vulnerability in the Microsoft Ancillary Function Driver Could Allow Elevation of Privilege
-KB954211: Vulnerabilities in Windows Kernel Could Allow Elevation of Privilege
-KB953155: Vulnerability in Windows Internet Printing Service Could Allow Remote Code Execution
-KB957095: Vulnerability in SMB Could Allow Remote Code Execution
-KB956841: Vulnerability in Virtual Address Descriptor Manipulation Could Allow Elevation of Privilege
-KB951071: Vulnerability in Message Queuing Could Allow Remote Code Execution

Moderate: KB957699: Vulnerability in Microsoft Office Could Allow Information Disclosure

More info:Microsoft Security Bulletin Summary for October 2008

Source:→ Microsoft