VRT Advisories


September 2007 Archive

VRT Rules 2007-09-25

Sourcefire VRT Rules Update

Date: 2007-09-25

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting Firefox, ClamAV and the Apache HTTP Server.

Details:

Firefox QuickTime Argument Injection (CVE-2007-5045):
A remote attacker may be able to execute commands via a QuickTime Media Link (QTL) file on systems using Firefox prior to version 2.0.7.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12593.

ClamAV Command Execution (CVE-2007-4560):
The clamav-milter used in ClamAV prior to version 0.91.2 when run in black hole mode, may allow a remote attacker to execute commands via shell meta-characters.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12592.

Apache HTTP Server Denial of Service (CVE-2007-1863):
The Apache HTTP Server (httpd), when caching is enabled and a threaded Multi-Processing Module (MPM) is used, is vulnerable to a Denial of Service (DoS) condition via a request using certain Cache-Control headers.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12591.

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.

Posted by on Sep 25, 2007



VRT Rules 2007-09-17

Sourcefire VRT Rules Update

Date: 2007-09-17

Synopsis:

This release provides two new rule groupings, Voice over IP (VoIP) rules and Content-Replace rules.

Details:

This group contains rules that are concerned with Voice over IP (VoIP) detection. This rule group focuses on known exploit attempts as well as providing detection for anomalous events.

Voice over IP rules:
This group contains rules that are concerned with Voice over IP (VoIP) detection.

Content-Replace rules:
This group contains rules that concentrate on replacing transaction data with innocuous strings to effectively deny a valid transaction while keeping a connection active. This allows a deployment where instant messaging may be allowed for communication purposes but where file transfer is prohibited.

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.

Posted by on Sep 17, 2007



VRT Rules 2007-09-11

Sourcefire VRT Rules Update

Date: 2007-09-11

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting Microsoft Agent, Microsoft Visual Studio and Microsoft MSN Messenger.

Details:

Microsoft Security Bulletin MS07-051:
Microsoft Agent contains a vulnerability that may allow a remote attacker to compromise a host. The agent fails to correctly process Uniform Resource Locators (URL) which may present the attacker with the opportunity to execute code.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12454.

Additionally, SID 1437 may generate events for attacks targeting this vulnerability.

Microsoft Security Bulletin MS07-052:
Some versions of Microsoft Visual Studio include a custom version of Crystal Reports that contains a vulnerability that may allow an attacker to execute code on a host. An attacker may use a specially crafted RPT file to compromise an affected system.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 12455 and 12456.

Microsoft Security Bulletin MS07-054:
MSN Messenger and Windows Live Messenger contain remote code execution vulnerabilities that may be exploited by an attacker via a video chat invitation.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12457.

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.

Posted by on Sep 11, 2007



VRT Rules 2007-09-04

Sourcefire VRT Rules Update

Date: 2007-09-04

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting Apple mDNSresponder. This release also contains updated rules.

Details:

Apple mDNSresponder Buffer Overflow CVE-2007-3744:
A buffer overflow condition in mDNSresponder may allow an attacker to execute code on an affected system. The problem is present in the UPnP IGD (Internet Gateway Device Standardized Device Control Protocol) implementation.

More information is available from http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-3744.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12357.

As a result of ongoing research, the Sourcefire VRT has added multiple rules to the spyware-put, netbios and exploit rule groups.

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.

Posted by on Sep 04, 2007