VRT Advisories


VRT Rules 2007-07-12

Sourcefire VRT Rules Update

Date: 2007-07-12

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting hosts using Microsoft Windows Active Directory and Microsoft Excel.

Details:

Microsoft Security Bulletin MS07-039:
A heap overflow vulnerability exists in the way Microsoft Windows Active Directory handles LDAP messages. The vulnerability is due to a lack of convertible attributes validation in client LDAP request messages. Remote unauthenticated attackers can exploit this vulnerability to inject and execute arbitrary code on the affected target with System level privileges.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12069.

Microsoft Security Bulletin MS07-036:
A memory corruption vulnerability exists in the way Microsoft Excel processes files. The vulnerability is a result of insufficient data validation while processing the Version field in a BOF record. A remote attacker can exploit this vulnerability by enticing the target user to open a crafted Excel file, potentially causing arbitrary code to be injected and executed in the security context of the current user.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12070.

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 the network security industry.