VRT Advisories

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VRT Rules 2005-12-14

Sourcefire VRT Update

Date: 2005-12-14

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has learned of multiple vulnerabilities affecting hosts using the Microsoft operating system.

Details:

Microsoft Security Bulletin MS05-054 A vulnerability exists in the way that Internet Explorer handles COM objects that should not be used by Internet Explorer. When Internet Explorer tries to use these COM objects as ActiveX controls, an attacker may be presented with the opportunity to execute code of their choosing on the target system.

Rules to detect attacks targeting this vulnerability are included in this update and are identified as sids 4890 through 4915.

A vulnerability exists in the way Internet Explorer handles the window() function supplied to the javascript "onload" handler as a parameter. The conditions for exploitation occur when a page is opened in the browser that uses <body onload=window();>

The Sourcefire VRT has confirmed that a rule identified as sid 4647, released on November 9, 2005, will generate events when an attempt is made to exploit this vulnerability.

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 Dec 14, 2005



VRT Rules 2005-12-08

Sourcefire VRT Certified Rules Update

Date: 2005-12-08

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has learned of a vulnerability in the Symantec AntiVirus Web Interface. In addition, the Sourcefire VRT has made numerous rule reference additions to existing rules in order to provide users more context for generated events.

Details:

A buffer overflow vulnerability exists in the Symantec AntiVirus Scan Engine Web Service Administrative Interface. The vulnerability exists because user supplied data is not properly checked before processing.

A rule to detect attacks targeting this vulnerability is included in this update and is identified as sid 4681.

The Sourcefire Vulnerability Research Team (VRT) has made numerous rule reference additions to existing rules and has added a number of new rules to provide coverage for additional attack vectors for existing vulnerabilities.

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 Dec 08, 2005



VRT Rules 2005-12-01

Sourcefire VRT Advisory

Date: 2005-12-02

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has learned of a Trojan Horse downloader program that uses a vulnerability in the way that Internet Explorer handles a Javascript event as an attack vector.

The Sourcefire VRT has confirmed that a rule identified as sid 4647, released on November 9, 2005, will generate events when an attempt is made to exploit this vulnerability.

Details:

A vulnerability exists in the way Internet Explorer handles the window() function supplied to the javascript "onload" handler as a parameter. The conditions for exploitation occur when a page is opened in the browser that uses <body onload=window();>.

The Delf-DH Trojan downloader uses this vulnerability to exploit vulnerable systems and gives an attacker the ability to download Trojan Horse programs of their choosing onto a vulnerable system.

Detection:

Sourcefire rule packs released on November 9, 2005 contained sid 4647 that will generate events when an attempt is made to exploit this vulnerability.

Note: Sid 4647 is NOT enabled by default, should customers wish to detect attempts to exploit this vulnerability this rule should be enabled. Instructions on how to do this can be found in the product User Guide.

Additional References:

Microsoft Security Advisory (911302)
http://www.microsoft.com/technet/security/advisory/911302.mspx

Microsoft Malicious Software Encyclopedia
http://www.microsoft.com/security/encyclopedia/details.aspx?name=TrojanDownloader:Win32/Delf.DH

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 Dec 01, 2005



VRT Rules 2005-11-22

Sourcefire VRT Advisory

Date: 2005-11-22

Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has learned of the release of proof of concept code that demonstrates the ability to execute code via a vulnerability in the way that Internet Explorer handles a Javascript event.

The Sourcefire VRT has confirmed that a rule identified as sid 4647, released on November 9, 2005, will generate events when an attempt is made to exploit this vulnerability, including the use of the proof of concept code.

Details:

A vulnerability exists in the way Internet Explorer handles the window() function supplied to the javascript "onload" handler as a parameter. The conditions for exploitation occur when a page is opened in the browser that uses <body onload=window();>.

Detection:

Sourcefire rule packs released on November 9, 2005 contained sid 4647 that will generate events when an attempt is made to exploit this vulnerability, including the use of the proof of concept code.

Note: Sid 4647 is NOT enabled by default. Should detection for this vulnerability be needed, this rule should be enabled.

Additional References:

Microsoft Security Advisory (911302)
http://www.microsoft.com/technet/security/advisory/911302.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 Nov 22, 2005



VRT Rules 2005-11-17

Sourcefire VRT Certified Rules Advisory

Date: 2005-11-17


Synopsis:

The Sourcefire Vulnerability Research Team (VRT) has learned of a vulnerability in the Microsoft implementation of RPC (MSRPC) that may allow an attacker to perform a Denial of Service (DoS) attack on an affected platform.

The Sourcefire VRT has confirmed that a rule identified as sid 4324, released on October 12, 2005, will generate events when an attempt is made to exploit this vulnerability via the UPnP service.

Details:

A vulnerability exists in the Microsoft RPC system that may present a remote attacker with the opportunity to cause a DoS condition on an affected host.

The condition is manifest when a malformed request is made to the UPnP service in the data section of a call to the GetDeviceList function. On processing this request, memory consumption increases to the point where the system becomes unresponsive, repeated requests of this nature will cause the DoS to occur.

Detection: Sourcefire SEU 5 and rule packs 30 and 40 released on October 12, 2005 contained sid 4324 that will generate events when an attempt is made to cause the DoS via the UPnP service.

Additional References:


Microsoft:
http://www.microsoft.com/technet/security/advisory/911052.mspx

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 Nov 17, 2005



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