VRT Advisories

VRT Rules 2007-07-10

Sourcefire VRT Rules Update

Date: 2007-07-10


The Sourcefire VRT is aware of vulnerabilities affecting hosts using Microsoft IIS, Microsoft Windows Firewall and the Microsoft .NET Framework.


Microsoft Security Bulletin MS07-041:
Microsoft Internet Information Services (IIS) contains a programming error that may allow an attacker to execute code on a vulnerable system. The problem occurs in the processing of URLs, in that a malformed request may cause a null pointer dereference and present the attacker with the opportunity to execute code in the context of the user running the service.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12064.

Microsoft Security Bulletin MS07-040:
The Microsoft .NET Framework suffers from a vulnerability that may allow a remote attacker to compromise a host using the Framework.

A previously released rule will detect attacks targeting this vulnerability and is identified as SID 11192.

Microsoft Security Bulletin MS07-038:
The Microsoft Windows Firewall fails to correctly handle IPv6 packets when tunnelled over UDP to traverse an IPv4 Network Address Translation. This may allow an attacker to initiate network communications with a host and bypass any Microsoft Windows based firewalls in the process.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 12065 through 12068.

Additionally, SID 8446 may also generate events on IPv6 traffic encapsulated in IPv4.

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.