VRT Advisories


May 2007 Archive

VRT Rules 2007-05-24

Sourcefire VRT Update

Date: 2007-05-24

Synopsis:

The Sourcefire VRT is aware of a vulnerability affecting Apple OS X systems which may allow a remote attacker to execute code on an affected system.

Details:

Apple OS X mDNSResponder Buffer Overflow (CVE-2007-2386):
In the default configuration, Apple OS X has mDNSResponder installed and listening on an ephemeral port. This service suffers from a buffer overflow condition that is manifest when excess data in the Location header is sent in a connection.

An existing rule has been modified to detect attacks targeting this vulnerability and is included in this release. It is identified as SID 1388.

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 May 24, 2007



VRT Rules 2007-05-18

Sourcefire VRT Advisory

Date: 2007-05-18

Synopsis:

This release provides a fix for an error that may occur when editiing and saving a policy.

Details:

This release fixes an issue that causes an error when editing and saving policies. A solution to the problem is outlined in the advisory for SEU 76, this release fixes the problem and no further action is necessary.

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 May 18, 2007



VRT Rules 2007-05-16

Sourcefire VRT Advisory

Date: 2007-05-16

Synopsis:

The Sourcefire VRT is aware of a technique that may be used in an attempt to bypass detection by IDS and IPS devices.

Details:

HTTP content scanning systems Unicode encoding bypass (VU#739224). US-CERT has issued a vulnerability note describing a technique that may be used in an attempt to evade detection by IDS and IPS devices.

For more information see http://www.kb.cert.org/vuls/id/739224

Sourcefire customers with SEU 76 or later installed are not affected by this evasion technique.

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 May 16, 2007



VRT Rules 2007-05-14

Sourcefire VRT Update

Date: 2007-05-14

Synopsis:

The Sourcefire VRT is aware of a vulnerability affecting an ActiveX control used by Symantec Norton AntiVirus products.

Details:

Symantec Norton AntiVirus ActiveX Control (CVE-2006-3456):
An ActiveX control used by Symantec Norton AntiVirus products contains a vulnerability that may allow an attacker to execute code on an affected host.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 11268 through 11271.

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 May 14, 2007



VRT Rules 2007-05-08

Sourcefire VRT Update

Date: 2007-05-08

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting Microsoft DNS Server Service, Microsoft Exchange Server, Microsoft CAPICOM, Microsoft Internet Explorer and Microsoft Excel.

Details:

Microsoft Security Bulletin MS07-029
Microsoft DNS Server Service is prone to a vulnerability that may allow a remote attacker to execute code on an affected system. The issue is present in the RPC interface of servers using Microsoft's implementation of DNS.

In order to detect attacks targeting this vulnerability, the DCE/RPC preprocessor must be configured to use 'autodetect'. This is the default behavior for this preprocessor.

Detection for attacks targeting this vulnerability was previously released.

Microsoft Security Bulletin MS07-028
A vulnerability in Microsoft Cryptographic API Component Object Model (CAPICOM) may allow a remote attacker to execute code on an affected system.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 11230 through 11235

Microsoft Security Bulletin MS07-027
Microsoft Internet Explorer suffers from programming errors that may allow a remote attacker to execute code on an affected system.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 11224 through 11229, 11247, 11248 and 11257.

Also, other rules that detect attacks targeting this vulnerability were previously released and are identified as SIDs 9427 and 9428.

Microsoft Security Bulletin MS07-026
Microsoft Exchange Server incorrectly handles certain electronic mail transactions. This may allow a remote attacker to execute code on an affected system.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 11222.

Additionally, a rule that also detects attacks targeting this vulnerability was previously released and is identified as SID 2665.

Microsoft Security Bulletin MS07-023
Microsoft Excel is prone to a vulnerability that may allow a remote attacker to execute code on an affected system.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 11258.

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 May 08, 2007