VRT Advisories


September 2006 Archive

VRT Rules 2006-09-21

Sourcefire VRT Update

Date: 2006-09-21

Synopsis:

The Sourcefire VRT has learned of a vulnerabilities in Microsoft Windows systems that may present an attacker with the opportunity to execute code of their choosing on affected systems.

Details:

Microsoft Security Advisory (925568) Microsoft Internet Explorer suffers from a buffer overflow condition that may allow an attacker to execute code of their choosing on an affected host. The condition is manifest when processing pages using Vector Markup Language. This vulnerability is being used as an attack vector for the Trojan Horse program Trojan.Vimalov.

A rule to detect attacks targeting this vulnerability is included in this rule pack and is identified as sid 8416.

Microsoft Security Bulletin MS06-039 Microsoft Office programs are prone to a buffer overflow condition when processing malformed GIF images. This may present an attacker with the opportunity to execute code of their choosing on an affected host.

A rule to detect attacks targeting this vulnerability is included in this rule pack and is identified as sid 8414.

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 Sep 21, 2006



VRT Rules 2006-09-20

Sourcefire VRT Advisory

Date: 2006-09-12

Synopsis:

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

Details:

Microsoft Security Bulletin MS06-054:
Microsoft Publisher 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 .pub file.

The OfficeCat tool has been updated to process Microsoft Publisher files to determine if the file contains possible exploit code for 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 Sep 20, 2006



VRT Rules 2006-09-19

Sourcefire VRT Update

Date: 2006-09-19

Synopsis:

The Sourcefire VRT has learned of a vulnerability in the way that Microsoft Windows systems process Pragmatic General Multicast (PGM) traffic.

Details:

Microsoft Security Bulletin MS06-052 When hosts using certain versions of the Microsoft Windows operating system attempt to process PGM messages using the Microsoft Message Queuing Service (MSMQ), the system may be exposed to a buffer overflow condition. If the message contains more options than indicated in the packet header, a static buffer may be overflowed allowing an attacker to possibly execute code of their choosing on an affected host.

A shared object rule to detect attacks against this vulnerability is included in this rule pack and is identified as gid 3 sid 8351.

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 Sep 19, 2006



VRT Rules 2006-09-15

Sourcefire VRT Update

Date: 2006-09-15

Synopsis:

The Sourcefire VRT has learned of multiple vulnerabilities affecting hosts using the Microsoft Operating system.

Details:

Microsoft Security Bulletin MS06-054 Microsoft Publisher suffers from a programming error that may allow a remote attacker to execute code of their choosing on an affected host. The error is manifest when Publisher processes fonts embedded in a .pub file.

A Rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 8350.

Microsoft Security Bulletin MS06-053 Microsoft Indexing Service fails to correctly process user supplied input which may allow a remote attacker to execute a cross site scripting attack against a vulnerable server.

A Rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 8349.

Microsoft Security Bulletin MS06-008 A buffer overflow condition exists in the Microsoft Web Client service which may allow a remote attacker to execute code of their choosing on an affected system. The flaw can be exploited by an authenticated or guest user via RPC.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 8157 through 8348.

Microsoft Security Bulletin MS06-007 The Microsoft Windows Operating system suffers from a Denial of Service (DoS) condition that is present when handling malformed IGMPv3 data.

A shared object rule to detect attacks against this vulnerability is included in this rule pack and is identified as gid 3 sid 8092.

Microsoft Security Bulletin MS06-041 The Microsoft Windows DNS Client is vulnerable to a buffer overflow condition when handling RDATA in server responses. A remote attacker can take advantage of this to execute code of their choosing on an affected system.

A new DNS dynamic preprocessor has been developed and released to detect attacks against this vulnerability. This preprocessor has the gid 131 and sids 1 through 3.

Note:In order to use this new pre-processor, Snort 2.6.0.2 must be downloaded. Refer to the README.dns for configuration options. In order to detect attacks against MS06-041 the following configuration is required:

  preprocessor dns: ports {53} enable_rdata_overflow

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 Sep 15, 2006



VRT Rules 2006-09-12

Sourcefire VRT Advisory

Date: 2006-09-12

Synopsis:

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

Note:The DocCheck tool has also been renamed to OfficeCat to reflect the more global nature of the problem.

Details:

Microsoft Security Advisory (925059)
Microsoft Word 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 .doc file.

The OfficeCat tool has been updated to process Microsoft Office 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

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 Sep 12, 2006



Community 2006-09-05

Sourcefire Community Rule Update 2006-09-05

Sourcefire Community Rule Update

Date: 2006-09-05

This message is to announce the availability of an update for the Sourcefire community rule set, which can be downloaded free of cost or registration from http://www.snort.org/pub-bin/downloads.cgi.

New rules in this release are identified as SIDs 100000874-100000891. These rules cover detection of TOR and Google Talk traffic, which may be policy violations in some environments cross-site scripting attempts against the Roller Weblog system a buffer overflow attempt against ImageMagick remote file inclusion attacks against PHP Live Helper and Inlink SQL injection against SimpleBlog and other attacks against the pHNews, Proxima, pmwiki, tikiwiki, yappa-ng, and Webmin/Usermin systems.

Sourcefire would like to thank the following submitters for their contributions:

* Dan Ramaswami for SIDs 100000874-100000875 * Will Young for 100000876-100000877 * p3rlhax@gmail.com for SIDs 100000878-100000880

Community Rule Pack Update Summary:

For a complete list of new and modified rules use this link.

To submit rules to the Community rule set use this link.

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 Sep 05, 2006



VRT Rules 2006-09-01

Sourcefire VRT Update

Date: 2006-09-01

Synopsis:

The Sourcefire VRT has continued research into vulnerabilities affecting Microsoft Internet Explorer and has also added multiple new rules in the spyware-put category. The VRT has also improved the performance of multiple rules and has improved reference information for multiple rules.

Details:

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 against these vulnerabilities are included in this rule pack and are identified as sids 7862 through 8058.

As a result of continuing research in the field of Spyware and potentially unwanted technology, the Sourcefire VRT has added multiple rules to the Spyware and Backdoor rule sets.

Each rule is also accompanied by detailed documentation for each Trojan, Spyware and potentially unwanted software to assist in determining the likelihood of infection and has relevant links to information regarding their removal.

These rules are identified as sids 7794 through 7857.

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 Sep 01, 2006