VRT Advisories

VRT Rules 2009-02-24

Sourcefire VRT Rules Update

Date: 2009-02-24


After additional research, the Sourcefire VRT has added improved detection for a vulnerability affecting Adobe Acrobat and Acrobat Reader to reduce the possibility of false positive events from occurring.


Adobe Acrobat and Reader Buffer Overflow: Adobe Acrobat and Adobe Acrobat Reader contain a programming error that may allow remote attackers to execute code on a vulnerable system. The error occurs in the processing of files that use the JBIG2 compression routines on PDF files. This issue affects both products on Microsoft Windows, Linux and Mac OS X platforms.

A previously released rule to detect attacks targeting this vulnerability is included in this release and is now identified with GID 1, SID 15358. This rule was previously identified with GID 1, SID 15356.

Also, extra rules have been added to detect malicious pdf files being sent via email as well as a generic rule to detect any pdf files being sent via email.

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.