VRT Advisories


October 2006 Archive

VRT Rules 2006-10-18

Sourcefire VRT Update

Date: 2006-10-18

Synopsis:

The Sourcefire VRT has added multiple rules in the spyware-put and backdoor categories to provide coverage for emerging spyware and trojan horse threats. The VRT has also updated numerous rules in the FTP category to accommodate larger default values for FTP services, additionally reference information has been added and improved throughout the VRT Certified Rule Set.

Details:

As a result of ongoing research, the Sourcefire VRT has added multiple rules to the spyware and backdoor rule sets to provide coverage for emerging threats from these technologies.

A number of rules in the FTP rule category have been updated to accommodate larger default values in some FTP services.

The VRT has also updated and added reference information throughout the entire Sourcefire VRT Certified Rule Set.

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 Oct 18, 2006



VRT Rules 2006-10-11

Sourcefire VRT Update

Date: 2006-10-11

Synopsis:

Microsoft has released a number of bulletins regarding vulnerabilities in its products, the Sourcefire VRT has continued research into these issues and has released additional rules to complement previously released rules.

Additionally, multiple reference updates have been made throughout the VRT Certified Ruleset.

Details:

Microsoft Security Bulletin MS06-065:
The Microsoft Windows Object Packager does not correctly process file names. This may allow a remote attacker to execute code of their choosing via a malformed file.

A rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 8445.

Microsoft Security Bulletin MS06-059:
Microsoft Excel for the Macintosh operating system contains a vulnerability that may allow a remote attacker to execute code of their choosing on an affected system via the use of a malformed COLINFO record in an xls file. This vulnerability also affects the Microsoft Excel Viewer.

A rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 8448.

Microsoft Security Bulletin MS06-063:
The Microsoft Operating System is prone to a vulnerability that may allow a remote attacker to cause a Denial of Service (DoS) on an affected system. The vulnerability occurs when the system attempts to process a malformed SMB RENAME command.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 8449 through 8460.

The mailslot service is used on hosts using the Microsoft Operating System to handle messages between hosts on a domain.

An unchecked buffer in the mailslot server service may allow an attacker to overflow a fixed length buffer and execute code of their choosing on an affected host.

Rules to detect attacks targeting this vulnerability were previously released and are identified as sids 7035 through 7046.

Microsoft Security Bulletin MS06-056:
The Microsoft .NET Framework is vulnerable to a cross site scripting vulnerability that may allow remote attackers to access sensitive information.

Rules to detect attacks targeting this vulnerability were previously released and are identified as sids 1497 and 7070.

Microsoft Security Bulletin MS06-057:
Multiple vulnerabilities exist in the way that Microsoft Internet Explorer handles ActiveX controls. It may be possible for an attacker to execute code of their choosing on a system using Internet Explorer.

Rules to detect attacks targeting this vulnerability were previously released and are identified as sids 7985 through 7988 and sid 8419.

Microsoft Security Bulletins MS06-058, MS06-059 and MS06-060:
Microsoft Office products (Word, Excel and Powerpoint) are prone to vulnerabilities that may allow an attacker to execute code of their choosing on an affected host via a malformed file.

The OfficeCat tool, previously released by the Sourcefire VRT, is able to process these files to determine if possible exploit conditions exist in an Office document.

Note:
All previously released rules are contained in the latest rule pack, it is not necessary to install prior rule packs to get the relevant rules mentioned in this advisory.

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 Oct 11, 2006



VRT Rules 2006-10-10

Sourcefire VRT Advisory

Date: 2006-10-10

Synopsis:

Microsoft has released a number of bulletins regarding vulnerabilities in its products. A number of these issues have been previously covered by Sourcefire VRT rule packs and by the OfficeCat tool.

Details:

Microsoft Security Bulletin MS06-056:
The Microsoft .NET Framework is vulnerable to a cross site scripting vulnerability that may allow remote attackers to access sensitive information.

Rules to detect attacks targeting this vulnerability were previously released and are identified as sids 1497 and 7070.

Microsoft Security Bulletin MS06-057:
Multiple vulnerabilities exist in the way that Microsoft Internet Explorer handles ActiveX controls. It may be possible for an attacker to execute code of their choosing on a system using Internet Explorer.

Rules to detect attacks targeting this vulnerability were previously released and are identified as sids 7985 through 7988 and sid 8419.

Microsoft Security Bulletin MS06-063:
The mailslot service is used on hosts using the Microsoft Operating System to handle messages between hosts on a domain.

An unchecked buffer in the mailslot server service may allow an attacker to overflow a fixed length buffer and execute code of their choosing on an affected host.

Rules to detect attacks targeting this vulnerability were previously released and are identified as sids 7035 through 7046.

Microsoft Security Bulletins MS06-058, MS06-059 and MS06-060:
Microsoft Office products (Word, Excel and Powerpoint) are prone to vulnerabilities that may allow an attacker to execute code of their choosing on an affected host via a malformed file.

The OfficeCat tool, previously released by the Sourcefire VRT, is able to process these files to determine if possible exploit conditions exist in an Office document.

Note:
All previously released rules are contained in the latest rule pack, it is not necessary to install prior rule packs to get the relevant rules mentioned in this advisory.

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 Oct 10, 2006



VRT Rules 2006-10-04

Sourcefire VRT Update

Date: 2006-10-04

Synopsis:

The Sourcefire VRT has learned of vulnerabilities affecting OpenSSL libraries and McAfee ePolicy Orchestrator and ProtectionPilot that may allow remote code execution on affected systems.

Details:

OpenSSL Buffer Overflow CVE-2006-3738:
OpenSSL libraries are prone to a buffer overflow condition that may allow a remote attacker to execute code of their choosing or cause a Denial of Service (DoS) on an affected system.

This vulnerability affects software using these libraries and as such the attack vector may be present in a number of services, such as web and mail server daemons.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 8426 through 8440..

McAfee ePolicy Overflow CVE-2006-5156:
McAfee ePolicy Orchestrator and ProtectionPilot use a web server that does not properly bounds check user supplied data. This may allow an attacker to overflow a fixed length buffer on an affected system and run code of their choosing.

A rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 8441.

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 Oct 04, 2006



VRT Rules 2006-10-03

Sourcefire VRT Advisory

Date: 2006-10-03

Synopsis:

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

Details:

Microsoft Security Advisory (925984):
Microsoft PowerPoint contains a vulnerability that may allow an attacker to execute code of their choosing on a vulnerable system via the use of a malformed .ppt file.

Note: A number of Trojan Horse programs are known to be using this vulnerability as an attack vector.

The OfficeCat tool has been updated to process Microsoft Office files to determine if the file contains possible exploit conditions relevant to this vulnerability.

OfficeCat tool download

download zip archive here

Instructions for use

  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. 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 Oct 03, 2006



VRT Rules 2006-10-02

Sourcefire VRT Update

Date: 2006-10-02

Synopsis:

The Sourcefire VRT has continued research into vulnerabilities affecting Microsoft products. This rule pack reflects that effort by introducing new rules and improving the detection capabilities of previously released ones.

Details:

Microsoft Security Bulletin MS06-042 Microsoft Internet Explorer is vulnerable to a Denial of Service (DoS) which may possibly also lead to the execution of code of an attackers choosing. The error lies in the way that Internet Explorer tries to instantiate certain COM objects as ActiveX controls.

A rule to detect attacks targeting this vulnerability is included in this rule pack and is identified as sid 8425.

Microsoft Internet Explorer also suffers from a number of other vulnerabilities relating to the way it handles ActiveX controls. These vulnerabilities may also lead to a DoS condition and the possible execution of code of the attackers choosing.

Rules to detect attacks against these vulnerabilities are included in this rule pack and are identified as sids 8417 through 8424.

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 Oct 02, 2006