VRT Advisories

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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



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



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