VRT Advisories

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VRT Rules 2005-09-26

Sourcefire VRT Certified Rules Update

Date: 2005-09-26

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has made numerous rule reference additions and documentation improvements as well as adding new rules to detect attempts to exploit vulnerabilities in Microsoft Step-by-Step Interactive Training and Internet Explorer's handling of ActiveX objects.

Details:

This is a maintenance release for Sourcefire VRT rules. Numerous references have been added to existing rules and rule documentation has been updated. Along with this maintenance release, new rules have been added to address exploit attempts against Microsoft Step-by-Step Interactive Training and an additional attack vector against Internet Explorer's handling of ActiveX objects.

A vulnerability exists in Microsoft Step-by-Step Interactive Training that may allow an attacker to run code of their choosing on a vulnerable client.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 4194 through 4196.

Multiple vulnerabilities exist in Microsoft Internet Explorer that may allow an attacker to execute code of their choosing on a vulnerable system. This can be achieved by manipulating the trust between Internet Explorer and ActiveX objects.

A rule to detect attacks against these vulnerabilities is included in this rule pack and is identified as sid 4197.

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 network security industry.

Posted by on Sep 26, 2005



VRT Rules 2005-09-19

Sourcefire VRT Certified Rules Update

Date: 2005-09-19

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has learned of serious vulnerabilities affecting Sun Microsystems Solaris operating system. The VRT has also done extensive work to update detection for exploit attempts against various vulnerabilities affecting Microsoft Internet Explorer.

Details:

A vulnerability exists in the Solaris operating system that may allow an unprivileged users to remove any file on a system using the line printer daemon. This can be done via the Unlink command which can be used to unlink any file on a local or remote sytem accepting connections to lpd.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 4143 and 4144.

Multiple vulnerabilities exist in Microsoft Internet Explorer that may allow an attacker to execute code of their choosing on a vulnerable system. This can be achieved by manipulating the trust between Internet Explorer and ActiveX objects.

Rules to detect attacks against these vulnerabilities are included in this rule pack and are identified as sids 4145 through 4193.

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 network security industry.

Posted by on Sep 19, 2005



VRT Rules 2005-08-18

Sourcefire VRT Certified Rules Update

Date: 2005-08-18

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has learned of serious vulnerabilities affecting Veritas Backup Agent for Windows and Novell ZenWorks.

Details:

A vulnerability exists in Veritas Backup Exec Agent for Windows. This software uses Network Data Management Protocol (NDMP) to communicate between clients and servers. Authentication is required to successfully connect. A default user and MD-5 password hash can be used when MD-5 authentication is selected for a NDPM CONNECT_CLIENT_AUTH command to the server.

A Rule to provide coverage against attacks targeting this vulnerability is included in this rule pack and is identified as sid 4126.

Novell ZenWorks Remote Management Agent suffers from a programming error that may allow a remote and unauthenticated attacker to access memory space to the extent that it may be possible to execute code of their choosing and take control of a vulnerable system.

Rules to provide coverage against attacks targeting this vulnerability are included in this rule pack and are identified as sids 4129 and 4130.

Note: In order to use the Novell ZenWorks rules correctly, port 1761 must be added to the stream4_reassemble line in the snort configuration file.

To add port 1761 to the TCP reassembly configuration:

  1. Open the snort.conf file in a text editor
  2. Move to the line containing "preprocessor stream4_reassemble"
  3. Replace the line with the following:
    preprocessor stream4_reassemble: clientonly, ports 21 23 25 53 80 110 111 139 143 445 513 1433 1761
  4. Save the configuration
  5. Restart Snort

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 network security industry.

Posted by on Aug 18, 2005



VRT Rules 2005-08-14

Sourcefire VRT Certified Rules Update

Date: 2005-08-15

Update

The Sourcefire Vulnerability Research Team (VRT) is continuing to investigate the Zotob worm and associated Microsoft PnP Vulnerability. The VRT released rules on August 12th, 2005 that detect all attempts to exploit this vulnerability. These rules are identified as sids 3828 through 4125. The Zotob worm will alert on SID 3999. Inline users may wish to set this rule to 'drop' for added protection.

To ensure detection/prevention of all variants of the worm and additional potential attack vectors, the VRT recommends using Snort v2.3.x or higher. This will ensure the latest detection capabilities are being utilized. In addition, Snort v2.3.x uses are advised to make the following configuration change to snort.conf.

Add ports 139 and 445 to the TCP reassembly configuration.

  1. Open the snort.conf file in a text editor
  2. Move to the line containing "preprocessor stream4_reassemble"
  3. Replace the line with the following:
    preprocessor stream4_reassemble: clientonly, ports 21 23 25 53 80 110 111 139 143 445 513 1433
  4. Save the configuration
  5. Restart Snort

This configuration change is required regardless of the rules being used to detect attacks against the PnP vulnerability. Snort users running Snort version 2.4 and later need not make this change unless they have specified ports to reassemble in the snort.conf already. In this case, make sure the ports 139 and 445 are added to the list.

Snort users should note that rules written specifically to detect the currently known variants of Zotob may be evaded with each subsequent variation and will be prone to an increased false positive threshold. The Sourcefire VRT rules use the advanced capabilities of current versions of snort to nullify the evasion attempts of attack vector variants.

Date: 2005-08-14

Update:

The Sourcefire Vulnerability Research Team (VRT) has received reports of a new worm variant, known as Zotob, that makes use of the Plug-and-Play (PnP) vulnerability (MS05-039) to propagate. The worm uses exploit code that targets the PnP issue via port 445 and upon successful exploitation, it then uses ftp to transfer data from the infecting machine. The newly infected machine then becomes an ftp server itself and begins scanning for other vulnerable hosts to infect.

The VRT released rules on August 12th, 2005 that detect all attempts to exploit this vulnerability. These rules are identified as sids 3828 through 4125. The Zotob worm will alert on SID 3999. Inline users may wish to set this rule to 'drop' for added protection.

In addition, a patch for this vulnerability is available at http://www.microsoft.com/technet/security/Bulletin/MS05-039.mspx.

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 network security industry.

Posted by on Aug 14, 2005



VRT Rules 2005-08-12

Sourcefire VRT Certified Rules Update

Date: 2005-08-12

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has learned of a serious vulnerability affecting Microsoft Windows systems, additionally exploit code that targets the vulnerability is in distribution.

Details:

A programming error in the Plug and Play (PnP) service used by Microsoft Windows machines can present a remote attacker with the opportunity to overflow a fixed length buffer, execute code on the vulnerable system and escalate privileges on the host to the extent that they could take complete control of the affected machine.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 3828 through 4125.

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 network security industry.

Posted by on Aug 12, 2005



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