VRT Advisories

VRT Rules 2008-01-08

Sourcefire VRT Rules Update

Date: 2008-01-08


The Sourcefire VRT is aware of vulnerabilities affecting hosts using the Microsoft Windows operating system.


Microsoft Security Bulletin (MS08-001):
The Microsoft Windows operating system contains a programming error that may allow a remote attacker to execute code on an affected system. It should be noted however, that the likelihood of this issue being actively exploited is minimal.

Shared object rules to detect attacks targeting this vulnerability are included in this release and are identified with GID 3 and SIDs 13287 and 13288.

Rule Pack Summary:

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


The structure of the "so_rules" directory inside the rule packages has changed. The following is a break out of the new directory structure:


<distro> is one of the following values:
	a. CentOS-4.6
	b. CentOS-5.1
	c. FC-5
	d. OSX-10.4
	e. ubuntu-6.01.1

<platform> is one of the following values:
	a. i386

<snort-version> is one of the following values
	b. 2.7.0

There have been no changes to the src/ directory layout from previous packages.

The reason for this change is two fold. First, due to contract terms with some 3rd party research organizations, a small number of VRT certified rules will now only be delivered as binaries. This change applies only to SO rules. Non-SO rules will not be affected. Additionally, because of this change and to better serve the Snort community the VRT will pre-compile the "SO" rules so they are easier to use on the various platforms utilized by the snort community and the VRT subscribers.

If your platform / distribution is not currently listed above this does not mean these shared objects won’t work on your platform. Numerous Linux distributions share common libc versions and it is possible that one of the above distributions and platforms will work on your system. If none of the above combinations work on your platform, please send a note to the snort-sigs mailing list so we can determine the need for additional platforms and distributions to be added to the list of supported platforms.


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.