Microsoft Malware Protection Engine File Processing Remote Denial Of Service Vulnerability



Date Discovered

May 13, 2008


Microsoft Malware Protection Engine is prone to a remote denial-of-service vulnerability because it fails to properly validate user-supplied input when parsing specially crafted files. Attackers can exploit this issue to cause an affected computer to stop responding or to restart. Successful attacks will deny service to legitimate users.

Technologies Affected

  • Microsoft Antigen for Exchange 9
  • Microsoft Antigen for SMTP Gateway 9
  • Microsoft Forefront Client Security
  • Microsoft Forefront Security for Exchange Server 1.0
  • Microsoft Forefront Security for SharePoint Server 1.0
  • Microsoft Standalone System Sweeper
  • Microsoft Windows Defender
  • Microsoft Windows Defender x64 Edition
  • Microsoft Windows Live OneCare


Block external access at the network boundary, unless external parties require service.
Filter access to the affected computer at the network boundary if global access isn't needed. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Do not accept communications that originate from unknown or untrusted sources.
To reduce the likelihood of successful exploits, never handle files or visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.

The vendor has released an advisory and updates addressing this issue. The affected applications have built-in mechanisms to automatically detect and deploy the updates. Please see the referenced advisory for more information.



SoWhat from Nevis Labs

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