VRT Advisories

VRT Rules 2011-03-24

Sourcefire VRT Rules Update

Date: 2011-03-24


The Sourcefire VRT is aware of a problem concerning digital certificates issued by Comodo. Additionally, this release adds and modifies rules in several categories.


Comodo Digital Certificate Authority Fraud: The Sourcefire VRT is aware of the existance of nine fraudulent digital certificates issued by Comodo. Using these certificates, an attacker may be able to spoof content, perform various phishing attacks or perform man-in-the-middle attacks on sites and users relying on these certificates for identification purposes.

Rules to detect attacks targeting this vulnerability are included in this release and are identified with GID 1, SIDs 18565 through 18573.

Additionally, the Sourcefire VRT has added and modified multiple rules in the ftp, imap, specific-threats, spyware-put, web-activex and web-client rule sets to provide coverage for emerging threats from these technologies.

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.

why subscribe? || download rules