VRT Advisories


May 2006 Archive

VRT Rules 2006-05-26

Sourcefire VRT Update

Date: 2006-05-24

Synopsis:

The Sourcefire VRT has learned of vulnerabilities affecting hosts using RealVNC.

Details:

RealVNC is a multiplatform remote administration tool that allows networked hosts to connect to other hosts or mobile devices. It has a client-server architecture that requires the remote user to authenticate on connection to a RealVNC server.

A programming error in the authentication mechanism for RealVNC may allow an attacker to gain access to the host without supplying the correct credentials.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 6469 through 6471.

In response to continued feedback regarding the spyware-put rules, the Sourcefire VRT is continuing to improve coverage provided by these rules and the accuracy of detection. This rulepack contains modifications to this set of rules.

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 May 26, 2006



VRT Rules 2006-05-24

Sourcefire VRT Update

Date: 2006-05-24

Synopsis:

The Sourcefire VRT has learned of vulnerabilities affecting hosts using RealVNC.

Details:

RealVNC is a multiplatform remote administration tool that allows networked hosts to connect to other hosts or mobile devices. It has a client-server architecture that requires the remote user to authenticate on connection to a RealVNC server.

A programming error in the authentication mechanism for RealVNC may allow an attacker to gain access to the host without supplying the correct credentials.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 6469 through 6471.

In response to continued feedback regarding the spyware-put rules, the Sourcefire VRT is continuing to improve coverage provided by these rules and the accuracy of detection. This rulepack contains modifications to this set of rules.

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 May 24, 2006



VRT Rules 2006-05-10

Sourcefire VRT Update

Date: 2006-05-10

Synopsis:

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

Details:

Microsoft Security Bulletin MS06-18 A vulnerability exists in the implementation of the Microsoft Distributed Transaction Coordinator (MSDTC) due to a programming error which may present an attacker with the opportunity to deny service to legitimate users. MSDTC fails to properly check the length of data supplied to the service before passing it along to a fixed length buffer. This vulnerability does not allow an attacker to run code of their choosing, but it will cause the MSDTC service to stop responding.

CVE-2006-0034 Excess data passed to the opcodes BuildContextW or BuildContext may cause a heap based overflow to occur and cause the MSDTC service to stop responding.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 6443 through 6466.

CVE-2006-1184 Excess data in the values for uuidstring or guidin passed in a BuildContextW request may cause the MSDTC service to attempt to access memory it cannot use. The MSDTC service will cease responding.

Rules to detect attacks against this vulnerability are included in this rule pack and are identified as sids 6419 through 6442.

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 May 10, 2006



VRT Rules 2006-05-05

Sourcefire VRT Update

Date: 2006-05-05

Synopsis:

The Sourcefire VRT has added multiple rules to detect the use of Spyware and potentially unwanted technology on a protected network.

Details:

After receiving a favorable response from customers and the community, the Sourcefire VRT is continuing research in the field of Spyware and potentially unwanted technology. As a result of this research, multiple new rules have been added to the Spyware and Backdoor rule sets.

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

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 May 05, 2006