VRT Advisories


February 2009 Archive

VRT Rules 2009-02-27

Sourcefire VRT Rules Update

Date: 2009-02-27

Synopsis:

The Sourcefire VRT is aware of a vulnerability in Microsoft Excel that is being actively exploited by a Trojan Horse program.

Details:

Microsoft Excel Code Execution (CVE-2009-0238):
Microsoft Excel contains a programming error that may allow a remote attacker to execute code on a vulnerable system. The problem occurs when Excel attempts to process a specially crafted document with an invalid object.

This issue is being actively exploited by Trojan.Mdropper.AC.

A rule to detect attacks targeting this vulnerability is included in this release and is identified with GID 3, SID 15365.

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 27, 2009



VRT Rules 2009-02-24

Sourcefire VRT Rules Update

Date: 2009-02-24

Synopsis:

After additional research, the Sourcefire VRT has added improved detection for a vulnerability affecting Adobe Acrobat and Acrobat Reader to reduce the possibility of false positive events from occurring.

Details:

Adobe Acrobat and Reader Buffer Overflow: Adobe Acrobat and Adobe Acrobat Reader contain a programming error that may allow remote attackers to execute code on a vulnerable system. The error occurs in the processing of files that use the JBIG2 compression routines on PDF files. This issue affects both products on Microsoft Windows, Linux and Mac OS X platforms.

A previously released rule to detect attacks targeting this vulnerability is included in this release and is now identified with GID 1, SID 15358. This rule was previously identified with GID 1, SID 15356.

Also, extra rules have been added to detect malicious pdf files being sent via email as well as a generic rule to detect any pdf files being sent via email.

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 24, 2009



VRT Rules 2009-02-20

Sourcefire VRT Rules Update

Date: 2009-02-20

Synopsis:

The Sourcefire VRT is aware of a vulnerability affecting Adobe Acrobat and Acrobat Reader.

Details:

Adobe Acrobat and Reader Buffer Overflow: Adobe Acrobat and Adobe Acrobat Reader contain a programming error that may allow remote attackers to execute code on a vulnerable system. The error occurs in the processing of files that use the JBIG2 compression routines on PDF files. This issue affects both products on Microsoft Windows, Linux and Mac OS X platforms.

Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 1, SIDs 15356 and 15357.

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, 2009



VRT Rules 2009-02-10

Sourcefire VRT Rules Update

Date: 2009-02-10

Synopsis:

The Sourcefire VRT is aware of multiple vulnerabilities affecting Microsoft Internet Explorer, Exchange, SQL Server and Visio.

Details:

Microsoft Security Advisory MS09-002:
Microsoft Internet Explorer contains programming errors that may allow a remote attacker to execute code on a vulnerable system.

Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 3, SIDs 15304 and 15305.

Microsoft Security Advisory MS09-003:
Microsoft Exchange contains programming errors that may allow a remote attacker to execute code or cause a Denial of Service (DoS) on an affected system.

Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 3, SIDs 15301 and 15302.

Microsoft Security Advisory MS09-004:
A vulnerability in Microsoft SQL Server may allow a remote attacker to execute code on a vulnerable system. This issue may be exploited via the sp_replwritetovarbin stored procedure.

Rules to detect attacks targeting these vulnerabilities were included in a previous release and are identified with GID 1, SIDs 15127 through 15144.

Microsoft Security Advisory MS09-005:
Microsoft Visio contains programming errors that may allow a remote attacker to execute code on a vulnerable system via malformed Visio files.

Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 3, SIDs 15298, 15299 and 15303.

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 10, 2009



VRT Rules 2009-02-03

Sourcefire VRT Rules Update

Date: 2009-02-03

Synopsis:

As a result of ongoing research, the Sourcefire VRT has added multiple rules to the web-activex, specific-threats and chat rule sets to provide coverage for emerging threats from these technologies.

Details:

As a result of ongoing research, the Sourcefire VRT has added multiple rules to the web-activex, specific-threats and chat rule sets to provide coverage for emerging threats from these technologies.

Microsoft Security Advisory MS08-067:
After continued research into a vulnerability affecting the Microsoft implementation of DCE/RPC, the Sourcefire VRT has made improvements to the rules that detect attacks targeting this vulnerability in order to enhance performance.

The updated rules to detect attacks targeting this vulnerability are included in this release and are identified with GID 3, SIDs 14773 through 14985.

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 03, 2009