VRT Advisories

VRT Rules 2009-10-22

Sourcefire VRT Rules Update

Date: 2009-10-22


The Sourcefire VRT has modified and added rules in several categories.


Microsoft Security Advisory (MS09-059):
A vulnerability in the Microsoft Local Security Authority Subsystem Service (LSASS) may allow a remote attacker to cause a Denial of Service (Dos) against an affected system.

A previously released rule to detect attacks targeting this vulnerability has been modified to reduce the incidence of false positive events. It is included in this release and is identified with GID 3, SID 16167.

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.