VRT Advisories

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VRT Rules 2006-12-15

Sourcefire VRT Update

Date: 2006-12-15

Synopsis:

This release provides a new "specific-threats" rules category.

Details:

The Sourcefire VRT has added a new rules category named "specific-threats" that is designed to give specific event information when activity relating to known worms is identified in network data.

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 Dec 15, 2006



VRT Rules 2006-12-12

Sourcefire VRT Update

Date: 2006-12-12

Synopsis:

The VRT is aware of vulnerabilities affecting the Microsoft Operating System and has introduced new rules to provide coverage for exploitation attempts targeting these vulnerabilities.

Details:

Microsoft Security Bulletin MS06-078:
A vulnerability in the way that Microsoft Windows Media Player handles Advanced Systems Format (ASF) files may allow a remote attacker to execute code of their choosing on an affected system.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 9625.

Microsoft Security Bulletin MS06-077:
Microsoft Remote Installation Services (RIS) suffers from a programming error that may allow an attacker to upload files of their choosing onto the TFTP server; these files may then be installed onto machines using the service.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 9638.

Microsoft Security Bulletin MS06-076:
Microsoft Outlook Express does not correctly handle malformed Windows Address Book files. A remote attacker may be able to execute code of their choosing by supplying a specially crafted address book file to be read on a vulnerable host.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 9639.

Rules that may also indicate attacks targeting this vulnerability were previously released and are identified as SIDs 6412 and 6413.

Microsoft Security Bulletin MS06-074:
A vulnerability in the Microsoft SNMP service may allow a remote attacker to execute code of their choosing on a vulnerable system by supplying a malformed SNMP request to the service.

Rules to detect attacks targeting this vulnerable service were previously released and are identified as SIDs 1411 through 1414.

Microsoft Security Bulletin MS06-073:
Microsoft Visual Studio uses a WMI Wizard that does not correctly handle malformed WMI objects. This may allow a remote attacker to execute code of their choosing on a vulnerable host via a specially crafted web page.

Rules to detect attacks targeting this vulnerability were previously released and are identified as SIDs 8369 and 8370.

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 Dec 12, 2006



VRT Tool 2006-12-11

Sourcefire VRT Tool Update

Date: 2006-12-11

Synopsis:

The Sourcefire VRT has continued research into a vulnerability affecting Microsoft Word documents and has updated the OfficeCat tool to process Microsoft Word files to determine the presence of possible exploit conditions.

Details:

Vulnerability in Microsoft Word CVE-2006-5994:
Microsoft Word suffers from a vulnerability that may allow a remote attacker to execute code of their choosing on an affected host when malformed word files are processed by the application. The OfficeCat tool is able to process these files to determine the possible presence of exploit conditions in a file.

This vulnerability is outlined in Microsoft Security Advisory 929433, the OfficeCat tool has been updated to include support for the vulnerability outlined in this advisory.

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 Dec 11, 2006



VRT Rules 2006-12-07

Sourcefire VRT Update

Date: 2006-12-07

Synopsis:

The VRT has continued research into vulnerabilities affecting the Microsoft Operating System and has introduced new rules and modified existing rules to provide coverage for exploitation attempts targeting these vulnerabilities.

Details:

Microsoft Security Bulletin MS06-068:
A vulnerability in the way that the Microsoft Agent handles .acf files may allow a remote attacker to execute code on an affected system. The code will be executed with the permissions of the current user who may have administrative privileges.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 9432 and 9433.

3Com TFTP Service CVE-2006-6183:
The 3Com TFTP Service suffers from multiple buffer overflow vulnerabilities. A remote attacker may be able to cause a Denial of Service (DoS) or execute code of their choosing on an affected system by supplying excess data in a GET or PUT command to the service.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 9621.

Microsoft Security Bulletin MS03-026:
After continuing research into a vulnerability affecting Microsoft RPC, the VRT has modified a number of existing rules and introduced new rules to reduce false positive events and to provide greater coverage for possible additional attack vectors.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 9447 through 9618.

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 Dec 07, 2006



VRT Rules 2006-11-16

Sourcefire VRT Update

Date: 2006-11-16

Synopsis:

The Sourcefire VRT is aware of multiple vulnerabilities affecting systems using the Microsoft Windows Operating System some of which could allow an attacker to execute code or cause a Denial of Service (DoS) on an affected system.

Details:

Microsoft Security Bulletin MS06-066:
Multiple vulnerabilities exist in the way that Microsoft Client Service for Netware handles network communications. It may be possible for a remote attacker to execute code of their choosing on an affected system. It is also possible for an attacker to cause a Denial of Service (DoS) condition for the service.

The attacker does not need prior authentication for exploitation to take place on some operating systems.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 9132 through 9323.

WinZip ActiveX Control CVE-2006-5198:
It may be possible for a remote attacker to use the WinZip ActiveX control to execute code of their choosing on a vulnerable system.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 9129 through 9131.

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 Nov 16, 2006



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