VRT Advisories


February 2007 Archive

VRT Rules 2007-02-21

Sourcefire VRT Update

Date: 2007-02-21

Synopsis:

This SEU contains a modification to a shared object rule to account for possible false positives.

Details:

This SEU contains a modified shared object rule to take into account false positives that may be experienced under certain network conditions.

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 Feb 21, 2007



VRT Rules 2007-02-20

Sourcefire VRT Update

Date: 2007-02-20

Synopsis:

A remotely exploitable vulnerability exists in the DCE/RPC dynamic preprocessor included with Snort versions 2.6.1, 2.6.1.1, 2.6.1.2 and 2.7 Beta 1. For more details on the vulnerability refer to the advisory released on 2007-02-19.

Details:

The DCE/RPC preprocessor was vulnerable to a stack-based buffer overflow that could potentially allow a remote attacker to execute code in the context of the user running Snort.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 10158 through 10160.

Additionally a shared object rule to detect attacks targeting this vulnerability is included in this release and is identified as GID 3 SID 10161.

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 Feb 20, 2007



VRT Rules 2007-02-17

Sourcefire VRT Update

Date: 2007-02-17

Synopsis:

This Snort Engine Update (SEU) addresses a vulnerability in the DCERPC preprocessor.

Details:

A critical vulnerability exists in Sourcefire Intrusion Sensors. The DCERPC preprocessor is vulnerable to a stack-based buffer overflow that could potentially allow an attacker to remotely execute code.

This SEU contains an updated Detection Engine that resolve this issue.

Mitigation Factors:

Customer who cannot immediately install the SEU can mitigate this vulnerability by disabling the DCERPC preprocessor.

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 Feb 17, 2007



VRT Rules 2007-02-13

Sourcefire VRT Update

Date: 2007-02-13

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) is aware of multiple vulnerabilities affecting Microsoft products.

Details:

Microsoft Security Bulletin MS07-005:
Step-by-Step Interactive Training contains a remotely exploitable vulnerability that may allow an attacker to execute code on a vulnerable system.

Rules to detect attacks targeting this vulnerability were released on September 29, 2005 and are identified as SIDs 4195 and 4196.

Microsoft Security Bulletin MS07-008:
A vulnerability exists in the HTML Help ActiveX control that may allow a remote attacker to execute code on a vulnerable system.

Rules to detect attacks targeting this vulnerability were released on August 9, 2006 and are identified as SIDs 7439 and 7440.

Microsoft Security Bulletin MS07-009:
A vulnerability exists in the Microsoft Data Access Components (MDAC) ActiveX control that may allow a remote attacker to execute code on a vulnerable system.

A rule to detect attacks targeting this vulnerability was released on September 1, 2006 and is identified as SID 7866.

Microsoft Security Bulletin MS07-016:
Multiple vulnerabilities exist in Internet Explorer that may allow a remote attacker to execute code on a vulnerable system. The problems lie in how Internet Explorer handles COM objects and how the application handles FTP server responses.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 10137 through 10155.

Microsoft Security Bulletin MS07-014:
A vulnerability in Microsoft Word exists that may allow an attacker to execute code on an affected host using a specially crafted Word document.

Microsoft documents that exhibit vulnerable characteristics can be identified using the OfficeCat tool.

Microsoft Security Bulletin MS07-015:
Microsoft Excel contains a programming error that may allow an attacker to execute code on an affected host using a specially crafted Excel file.

Microsoft documents that exhibit vulnerable characteristics can be identified using the OfficeCat tool.

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 Feb 13, 2007



VRT Tool 2007-02-13

Sourcefire VRT Tool Update

Date: 2007-02-13

Synopsis:

The Sourcefire VRT has updated the OfficeCat tool to provide coverage for Excel and Word documents vulnerable to MS07-014 and MS07-015.

Details:

Microsoft Advisory MS07-014 and MS07-015: The OfficeCat tool has been updated to included detection for vulnerable conditions present in Microsoft Word and Excel documents as described in Microsoft advisories 07-014 and 07-015.

The OfficeCat tool is able to process Word, Excel and PowerPoint files and will return the appropriate reference information should possible exploit conditions be present in the document.

OfficeCat Tool Download:

Download zip archive here.

Usage Instructions:

  1. Unzip the archive
  2. Open a command shell
  3. Execute the tool executable with a document name for checking

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.

About Sourcefire

Sourcefire, Inc., the world leader in intrusion prevention, is transforming the way organizations manage and minimize network security risks with its 3D Approach - Discover, Determine, Defend - to securing real networks in real-time. For more information about Sourcefire, please visit www.sourcefire.com.

Posted by on Feb 13, 2007



VRT Rules 2007-02-12

Sourcefire VRT Update

Date: 2007-02-12

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) is aware of a vulnerability affecting Sun Solaris systems.

Details:

Sun Solaris Telnet Authentication Bypass: Sun Solaris systems are vulnerable to an authentication bypass vulnerability in the Telnet daemon. The issue may be exploited by a remote attacker who is able to use telnet to connect to the targeted machine. Exploit software is not required.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 10136.

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 Feb 12, 2007



VRT Tool 2007-02-12

Sourcefire VRT Tool Update

Date: 2007-02-12

Synopsis:

The Sourcefire VRT has updated the OfficeCat tool to provide coverage for Excel spreadsheets containing embedded flash object files (CVE-2006-3014).

Details:

CVE-2006-3014:
The OfficeCat tool has been updated to included detection for Excel spreadsheets that contain embedded shockwave flash objects. The embedded object when viewed with a vulnerable player, may allow a remote attacker to execute code on the machine in the context of the user viewing the file.

The OfficeCat tool is able to process Word, Excel and PowerPoint files and will return the appropriate reference information should possible exploit conditions be present in the document.

OfficeCat Tool Download:

Download zip archive here.

Usage Instructions:

  1. Unzip the archive
  2. Open a command shell
  3. Execute the tool executable with a document name for checking

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.

About Sourcefire

Sourcefire, Inc., the world leader in intrusion prevention, is transforming the way organizations manage and minimize network security risks with its 3D Approach - Discover, Determine, Defend - to securing real networks in real-time. For more information about Sourcefire, please visit www.sourcefire.com.

Posted by on Feb 12, 2007



VRT Rules 2007-02-09

Sourcefire VRT Update

Date: 2007-02-09

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) is aware of vulnerabilities affecting the Squid Proxy Server and the Microsoft Windows Operating System.

Details:

Squid Proxy Server CVE-2007-0247:
The Squid Proxy Server is prone to a Denial of Service (DoS) condition when handling malformed directory listing responses from remote FTP servers.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 10135.

Microsoft Security Bulletin MS06-032:
The Microsoft Windows operating system is prone to a Denial of Service (DoS) condition that is caused by the improper handling of TCP/IP packets.

A shared object rule to detect attacks targeting this vulnerability is included in this release and is identified as GID 3 SID 10127.

Multiple rules have been added and modified to provide coverage for other threats.

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 Feb 09, 2007



VRT Rules 2007-02-01

Sourcefire VRT Update

Date: 2007-02-01

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) is aware of vulnerabilities affecting BrightStor ARCserve Backup and has added a number of rules to the specific-threats and backdoor categories.

Details:

BrightStor ARCserve CVE-2007-0169:
Computer Associates BrightStor ARCserve Backup Suite is vulnerable to multiple remote buffer-overflow attacks due to poor checking of user-supplied data to the application.

Rules to detect attacks targeting these vulnerabilities are included in this release and are identified as SIDs 10117 through 10122.

Specific Threats Update:
Multiple rules have been added in the specific-threats category to provide further coverage for the Peacomm trojan and problems relating to weak authentication with some Voice over IP (VoIP) telephones.

Rules to detect activity from the Peacomm trojan are included in this release and are identified as SIDs 10113 and 10114.

Rules to detect attempts to exploit VoIP telephones are included in this release and are identified as SIDs 10123 and 10124.

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 Feb 01, 2007