VRT Advisories

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VRT Rules 2008-01-10

Sourcefire VRT Rules Update

Date: 2008-01-10

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting Samba, Skype and Apple QuickTime.

Details:

Samba Buffer Overflow (CVE-2007-6015):
A stack based buffer overflow condition is present in nmbd in certain versions of Samba. A remote attacker may be able to execute code on an affected system via a GETDC mailslot request.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 13291.

Skype Technologies Heap Corruption (CVE-2007-5989):
A programming error in the Skype URI handler may allow a remote attacker to cause memory corruption which may lead to code execution.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 13292.

Apple QuickTime Buffer Overflow (CVE-2007-4675):
Apple QuickTime does not perform adequate checks on user supplied data in QuickTime Virtual Reality movie files. A remote attacker may use this flaw to cause a buffer overflow and execute code on an affected system.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 13293.

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 Jan 10, 2008



VRT Rules 2008-01-08

Sourcefire VRT Rules Update

Date: 2008-01-08

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting hosts using the Microsoft Windows operating system.

Details:

Microsoft Security Bulletin (MS08-001):
The Microsoft Windows operating system contains a programming error that may allow a remote attacker to execute code on an affected system. It should be noted however, that the likelihood of this issue being actively exploited is minimal.

Shared object rules to detect attacks targeting this vulnerability are included in this release and are identified with GID 3 and SIDs 13287 and 13288.

Rule Pack Summary:

For a complete list of new and modified rules, click here.

IMPORTANT INFORMATION:

The structure of the "so_rules" directory inside the rule packages has changed. The following is a break out of the new directory structure:

so_rules/
	src/
	precompiled/
		   <distro>/
		           <platform>/
				     <snort-version>

Where:
<distro> is one of the following values:
	a. CentOS-4.6
	b. CentOS-5.1
	c. FC-5
	d. OSX-10.4
	e. ubuntu-6.01.1

<platform> is one of the following values:
	a. i386

<snort-version> is one of the following values
	a. 2.6.1.5
	b. 2.7.0
	c. 2.8.0.1

There have been no changes to the src/ directory layout from previous packages.

The reason for this change is two fold. First, due to contract terms with some 3rd party research organizations, a small number of VRT certified rules will now only be delivered as binaries. This change applies only to SO rules. Non-SO rules will not be affected. Additionally, because of this change and to better serve the Snort community the VRT will pre-compile the "SO" rules so they are easier to use on the various platforms utilized by the snort community and the VRT subscribers.

If your platform / distribution is not currently listed above this does not mean these shared objects won’t work on your platform. Numerous Linux distributions share common libc versions and it is possible that one of the above distributions and platforms will work on your system. If none of the above combinations work on your platform, please send a note to the snort-sigs mailing list so we can determine the need for additional platforms and distributions to be added to the list of supported platforms.

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 Jan 08, 2008



VRT Rules 2007-12-18

Sourcefire VRT Rules Update

Date: 2007-12-18

Synopsis:

The Sourcefire VRT is aware of a vulnerability affecting Samba and has updated coverage for MS07-068.

Details:

Samba Buffer Overflow (CVE-2007-2446):
Samba suffers from multiple buffer overflow conditions which may be exploited by a remote attacker via special MS-RPC requests. The attacker may be able to execute code on an affected system.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 12984 through 13157.

Microsoft Security Bulletin (MS07-068):
Microsoft Windows Media Format Runtime suffers from a programming error that may allow a remote attacker to execute code on a vulnerable system via a malformed Advanced Systems Format (ASF) file.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 13158 through 13160.

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 Dec 18, 2007



VRT Rules 2007-12-11

Sourcefire VRT Rules Update

Date: 2007-12-11

Synopsis:

The Sourcefire VRT is aware of multiple vulnerabilities affecting Microsoft products.

Details:

Microsoft Security Bulletin (MS07-063):
A vulnerability in the Microsoft implementation of Server Message Block Version 2 (SMBv2) may allow a remote attacker to execute code of their choosing on an affected system.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 12946 and 12947.

Microsoft Security Bulletin (MS07-064):
Microsoft DirectX suffers from a programming error that may allow a remote attacker to execute code on a vulnerable machine with the privileges of the current user.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 12971 and 12983.

Microsoft Security Bulletin (MS07-065):
Microsoft Message Queuing Service (MSMQ) fails to correctly validate user input before copying to a fixed length buffer. This may allow a remote attacker to execute code on a vulnerable system.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 12977 through 12982.

Microsoft Security Bulletin (MS07-068):
Microsoft Windows Media Format Runtime suffers from a programming error that may allow a remote attacker to execute code on a vulnerable system via a malformed Advanced Systems Format (ASF) file.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12972.

Microsoft Security Bulletin (MS07-069):
Microsoft Internet Explorer may allow a remote attacker to execute code on a vulnerable system via ActiveX controls.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 12948 through 12970.

Additionally, previously released rules will also detect attacks targeting this vulnerability and are identified as SIDs 4167 and 12393 through 12412.

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 Dec 11, 2007



VRT Rules 2007-12-04

Sourcefire VRT Rules Update

Date: 2007-12-04

Synopsis:

The Sourcefire VRT has added multiple rules in the spyware-put and backdoor categories to provide coverage for emerging spyware and Trojan Horse threats.

Details:

As a result of ongoing research, the Sourcefire VRT has added multiple rules to the spyware-put and backdoor rule sets to provide coverage for emerging threats from these technologies.

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 Dec 04, 2007



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