VRT Advisories

VRT Rules 2011-11-07

Sourcefire VRT Rules Update

Date: 2011-11-07


The Sourcefire VRT is aware of a vulnerability affecting hosts using the Microsoft Windows operating system.


Microsoft Security Advisory (2639658):
The Microsoft Windows TrueType font parsing engine contains a vulnerability that may allow a remote attacker to execute code on an affected system. A succesful exploitation of this vulnerability may allow the attacker to execute code in kernel mode. This vulnerability is also related to the Duqu malware.

A rule to detect attacks targeting this vulnerability is included in this release and is identified with GID 3, SID 20539.

Rule Pack Summary:

For a complete list of new and modified rules, click here.


Sourcefire VRT rule packs often utilize enhancements made to Snort. Operators should upgrade to the latest revision or patch level for Snort to ensure these enhancements are available before using these rules.

About the VRT:

The Sourcefire VRT is a group of leading edge intrusion detection and prevention experts working to proactively discover, assess and respond to the latest trends in hacking activity, intrusion attempts and vulnerabilities. This team is also supported by the vast resources of the open source Snort community, making it the largest group dedicated to advances in the network security industry.

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