VRT Advisories

VRT Rules 2006-02-15

Sourcefire VRT Update

Date: 2006-02-15


The Sourcefire VRT has learned of multiple vulnerabilities affecting hosts using the Microsoft operating system. The VRT has also added rules to detect Skype usage as well as attacks aimed at Qualcomm Worldmail and other applications.


Microsoft Security Bulletin MS06-005

Microsoft Media Player plugin is subject to a buffer overflow condition when handling embedded media in web pages. The plugin is used in Mozilla browsers on hosts using the Microsoft Windows operating system.

A value of more than 2081 bytes in the src tag of an embedded component handled by Windows media player may present an attacker with the opportunity to overflow a fixed length buffer and execute code of their choosing on a vulnerable host.

A rule to detect attacks targeting this vulnerability is included in this update and is identified as sid 5710.

Microsoft Security Bulletin MS06-006

Windows Media Player suffers from a programming error that may enable an attacker to run code of their choosing on a vulnerable system. The error occurs when processing malformed bitmap files with the application. A bitmap file with length zero is not correctly checked for actual length, and it may be possible for an attacker to create a malicious image with size 0 but with actual data in the image that can be copied into memory for execution.

A rule to detect attacks targeting this vulnerability is included in this update and is identified as sid 5711.

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.