VRT Advisories

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VRT Rules 2006-07-18

Sourcefire VRT Advisory

Date: 2006-07-18

Synopsis:

The Sourcefire VRT has researched a vulnerability affecting Microsoft Powerpoint and has updated the DocCheck tool to process ppt files to determine the possible presence of exploit conditions.

Details:

Microsoft Security Advisory (922970) Microsoft Powerpoint suffers from a programming error that may allow an attacker to execute code of their choosing on an affected system by including that code in a specially crafted Powerpoint file.

The Sourcefire VRT has updated the DocCheck tool to examine Powerpoint files and report possible malformed files that could exploit this vulnerability.

DocCheck Tool Download:

download zip archive here

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 Jul 18, 2006



VRT Rules 2006-07-13

Sourcefire VRT Update

Date: 2006-07-13

Synopsis:

The Sourcefire VRT has learned of vulnerabilities affecting hosts using the Microsoft Operating System and hosts using the Linux 2.6 kernel.

Details:

Microsoft Security Bulletin MS06-035 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 attempts to exploit this vulnerability are included in this rule pack and are identified as sids 7035 through 7046.

Microsoft Security Bulletin MS06-037 An Excel file containing a chart object and another additional object of any type with a large header length value, can be used to overflow a fixed length buffer and execute code of the attackers choosing on an affected host.

Rules to detect attempts to exploit this vulnerability are included in this rule pack and are identified as sids 7047 and 7048.

Linux hosts using the Netfilter module may be subject to a Denial of Service (DoS) condition when trying to process SCTP packets that do not contain chunks.

A rule to detect attempts to exploit this vulnerability is included in this rule pack and is identified as sid 7021.

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 Jul 13, 2006



VRT Rules 2006-07-06

Sourcefire VRT Update

Date: 2006-07-06

Synopsis:

The Sourcefire VRT is aware of a number of vulnerabilites affecting several web browsers, including Internet Explorer and Firefox. This rule pack contains a number of rules to detect these issues.

Details:

The Sourcefire VRT is aware of a number of vulnerabilities affecting web browser client applications. This rule pack contains a number of rules to address these issues.

These rules are identified as sids 7003 through 7018.

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 Jul 06, 2006



VRT Rules 2006-06-28

Sourcefire VRT Advisory

Date: 2006-06-28

Synopsis:

The Sourcefire VRT has continued research into a vulnerability affecting Microsoft Excel and has updated the DocCheck tool to process xls files to determine the presence of an exploit.

Details:

Microsoft Security Advisory (921365) Microsoft Excel contains a programming error that can allow a remote attacker to run code of their choosing on an affected host system via the processing of a malformed .xls file. The issue is present in the dynamic link library file HLINK.DLL which handles Universal Resource Identifiers (URI) embedded in office documents.

The DocCheck tool has been updated to process xls files to determine if the file contains possible exploit code for this vulnerability.

DocCheck 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

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 Jun 28, 2006



VRT Rules 2006-06-27

Sourcefire VRT Update

Date: 2006-06-27

Synopsis:

The Sourcefire VRT has continued research into a vulnerability affecting the Microsoft Operating System Routing and Remote Access Service (RRAS) and a vulnerability affecting Microsoft Excel.

Details:

Microsoft Security Bulletin MS06-025 Microsoft operating systems using Routing and Remote Access (RRAS) are vulnerable to a memory corruption problem that may be exploited by unauthenticated users. This may lead to code of the attackers choosing being run on an affected host.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 6714 through 7001.

Microsoft Security Advisory (921365) Microsoft Excel contains a programming error that can allow a remote attacker to run code of their choosing on an affected host system via the processing of a malformed .xls file. The issue is present in the dynamic link library file HLINK.DLL which handles Universal Resource Identifiers (URI) embedded in office documents.

A rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 7002.

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 Jun 27, 2006



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