VRT Advisories


VRT Rules 2005-12-14

Sourcefire VRT Update

Date: 2005-12-14

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has learned of multiple vulnerabilities affecting hosts using the Microsoft operating system.

Details:

Microsoft Security Bulletin MS05-054 A vulnerability exists in the way that Internet Explorer handles COM objects that should not be used by Internet Explorer. When Internet Explorer tries to use these COM objects as ActiveX controls, an attacker may be presented with the opportunity to execute code of their choosing on the target system.

Rules to detect attacks targeting this vulnerability are included in this update and are identified as sids 4890 through 4915.

A vulnerability exists in the way Internet Explorer handles the window() function supplied to the javascript "onload" handler as a parameter. The conditions for exploitation occur when a page is opened in the browser that uses <body onload=window();>

The Sourcefire VRT has confirmed that a rule identified as sid 4647, released on November 9, 2005, will generate events when an attempt is made to exploit this vulnerability.

Rule Pack Summary:

For a complete list of new and modified rules, click here.

Warning:
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.