VRT Advisories


VRT Rules 2006-08-02

Sourcefire VRT Update

Date: 2006-08-02

Synopsis:

The Sourcefire VRT has added multiple rules to detect attempts to exploit vulnerabilities in the Microsoft DHCP Client Service, Microsoft Excel and Microsoft Word.

Details:

Microsoft Security Bulletin MS06-036 A buffer overflow condition in the Microsoft Windows DHCP client service may allow a remote attacker to execute code of their choosing on a target system. The overflow can be triggered when the client service attempts to process a malformed server response.

A module to detect attacks against this vulnerability is included in this rule pack and is identified as gid 3 sid 7196.

Microsoft Security Bulletin MS06-038 Multiple vulnerabilities exist in the Microsoft Office suite of programs that may allow a remote attacker to execute code of their choosing on an affected host. The vulnerabilities lie in the processing of malformed strings or properties in a document.

Rules to detect attacks against these vulnerabilites are included in this rule pack and are identified as sids 7197 through 7205.

Microsoft Security Bulletin MS06-035 Microsoft Windows SMB service is subject to a Denial of Service condition. While this is not related directly to the vulnerabilities outlined in MS06-035, after continuing research the Sourcefire VRT has determined that slight modifications to rules previously released will detect attempts to use attack vectors targeting this vulnerability.

The updated rules are included in this rule pack and are identified as sids 7035 through 7046.

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.