VRT Advisories

VRT Rules 2006-01-27

Sourcefire VRT Update

Date: 2006-01-27


The Sourcefire VRT has added rules and improved detection capabilities as a result of ongoing research into vulnerabilities and in response to feedback regarding rule performance in certain situations.


The Sourcefire VRT has made extensive changes to the rule set in order to improve detection and reduce false positive events.

The VRT have switched to a new build system for the VRT Certified Rules. This new system uses all the same code the VRT uses to build the Sourcefire product rule packs. The VRT have done a couple weeks worth of testing to make sure this system works as expected, but with all systems there are sometimes bugs. Please report any problems to bugs@snort.org or research@sourcefire.com

Additionally this new merge system has fixed an issue with rules not being moved into deleted.rules correctly. The changelog now shows that number of rules have now been correctly moved to deleted.rules. These rules are no longer necessary for the operation of the system.

The VRT would also like to thank Jason Haar, Jeff Kell, and Russell Fulton for their help in tracking down several false positive conditions.

Please continue to submit false positive reports, these detailed reports with packet captures prove very useful in improving the quality of the Snort rule set.

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 network security industry.