VRT Advisories


March 2006 Archive

VRT Rules 2006-03-29

Sourcefire VRT Update

Date: 2006-03-29

Synopsis:

The Sourcefire VRT has learned of vulnerabilities affecting hosts using Sendmail and has identified additional attack vectors for vulnerabilities affecting Microsoft HTML Help Workshop.

Details:

A race condition exists in versions of Sendmail, this vulnerability may allow a remote attacker to execute code of their choosing on an affected server. A programming error in the way that Sendmail handles asynchronous signals may allow an attacker to overflow a fixed length buffer by supplying a large amount of data in an email header.

A rule to detect attacks targeting this vulnerability is included in this update and is identified as sid 5739.

HTML Help Workshop fails to properly validate file contents before reading and putting information into a fixed length buffer. A malicious file may contain information that could overflow the buffer and execute code on the affected system.

Rules to detect attacks targeting this vulnerability are included in this update and are identified as sids 5740 and 5741.

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.

Posted by on Mar 29, 2006



VRT Rules 2006-03-08

Sourcefire VRT Update

Date: 2006-03-08

Synopsis:

The Sourcefire VRT has also added rules and improved detection capabilities as a result of ongoing research into vulnerabilities and in response to feedback regarding rule performance in certain situations.

Details:

Microsoft Security Bulletin MS05-027 A buffer overflow exists in the SMB (Server Message Block) Protocol implementation in Microsoft Windows 2000, Windows XP and Windows 2003 that allows attackers to cause a denial of service via a malformed request.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 5727 through 5783.

Apple Macintosh OS X suffers from a poorly designed use of resource forking for applications. It may be possible for an attacker to execute code of their choosing or execute system commands by exploiting the way in which OS X handles the opening of files determined to be safe.

A rule to detect exploits against this vulnerability is included in this rule pack and is identified as sid 5713.

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.

Posted by on Mar 08, 2006