VRT Advisories

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VRT Rules 2007-04-17

Sourcefire VRT Update

Date: 2007-04-17

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting hosts using the Microsoft DNS Server Service. This release enhances the detection capabilities for this vulnerability.

Details:

Microsoft Security Advisory (935964):
Microsoft DNS Server Service is prone to a vulnerability that may allow a remote attacker to execute code on an affected system. This 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 the preprocessor.

The Sourcefire VRT has continued research into this issue. As a result, this release provides improved detection for attacks targeting 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 the network security industry.

Posted by on Apr 17, 2007



VRT Rules 2007-04-16

Sourcefire VRT Update

Date: 2007-04-16

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting hosts using the Microsoft DNS Server Service. This release enhances the detection capabilities for this vulnerability.

Details:

Microsoft Security Advisory (935964):
Microsoft DNS Server Service is prone to a vulnerability that may allow a remote attacker to execute code on an affected system. This 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 the preprocessor.

This release provides updated detection for 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 the network security industry.

Posted by on Apr 16, 2007



VRT Rules 2007-04-13

Sourcefire VRT Update

Date: 2007-04-13

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting hosts using the Microsoft DNS Server Service.

Details:

Microsoft Security Advisory (935964):
Microsoft DNS Server Service is prone to a vulnerability that may allow a remote attacker to execute code on an affected system. This issue is present in the RPC interface of servers using Microsoft's implementation of DNS.

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

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 10518 through 10697

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 Apr 13, 2007



VRT Rules 2007-04-10

Sourcefire VRT Update

Date: 2007-04-10

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting hosts using the Microsoft UPnP service and the Microsoft Agent.

Details:

Microsoft Security Bulletin (MS07-019):
Microsoft Universal Plug and Play does not correctly handle malformed HTTP requests. This may allow an attacker to overflow a buffer and execute code on a vulnerable host.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 10475.

Microsoft Security Bulletin (MS07-020):
Microsoft Agent does not correctly handle malformed URLs. This may allow an attacker to cause a buffer overflow condition to occur and subsequently, execute code on an affected system.

Previously released rules will generate events when attempts are made to exploit this condition. These rules are identified as SIDs 4172 and 8846 through 8856. In addition, new rules are included in this release to detect attacks targeting this vulnerability and are identified as SIDs 10465 and 10474.

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 Apr 10, 2007



VRT Rules 2007-04-03

Sourcefire VRT Update

Date: 2007-04-03

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting Real Networks Helix Server, IBM Lotus SameTime ActiveX control and an issue with ipv6 traffic handling on OpenBSD systems. This release also coincides with the release of Snort version 2.6.1.4.

Sourcefire has addressed a number of potential security-related issues in Snort as reported by open source users, uncovered by internal investigations, and through third-party code audits.

Details:

OpenBSD IPv6 Fragmentation Overflow (CVE-2007-1365) and OpenBSD ICMP6 Denial of Service (CVE-2007-0343):
This release includes detection capabilities for attacks that attempt to exploit the IPv6 fragmentation overflow in OpenBSD-based operating systems.

Important Information about IPv6 Fragmentation Overflow Detection

Detection of traffic that attempts to exploit the IPv6 fragmentation overflow issue is enabled by default. If your Snort Sensors are deployed inline on your network, the malicious traffic is dropped automatically.

In order to disable this functionality, the following line needs to be added to snort.conf.

	config ipv6_frag: drop_bad_ipv6_frag off

Events generated by the preprocessor are identified as GID 123 and SIDs 9 and 10.

Real Networks Helix Server (CVE-2006-6026):
The Real Networks Helix Server fails to properly check user supplied data to the application. This may allow a remote attacker to overflow a fixed length buffer and execute code on a vulnerable host.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 10407.

IBM Lotus SameTime (CVE-2007-1784):
IBM Lotus SameTime fails to properly process user supplied input. This may allow an attacker to load DLL files and execute code by supplying suitable arguments to the loadLibrary function.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 10412 through 10417.

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 Apr 03, 2007



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