VRT Advisories

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VRT Rules 2006-11-16

Sourcefire VRT Update

Date: 2006-11-16

Synopsis:

The Sourcefire VRT is aware of multiple vulnerabilities affecting systems using the Microsoft Windows Operating System some of which could allow an attacker to execute code or cause a Denial of Service (DoS) on an affected system.

Details:

Microsoft Security Bulletin MS06-066:
Multiple vulnerabilities exist in the way that Microsoft Client Service for Netware handles network communications. It may be possible for a remote attacker to execute code of their choosing on an affected system. It is also possible for an attacker to cause a Denial of Service (DoS) condition for the service.

The attacker does not need prior authentication for exploitation to take place on some operating systems.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 9132 through 9323.

WinZip ActiveX Control CVE-2006-5198:
It may be possible for a remote attacker to use the WinZip ActiveX control to execute code of their choosing on a vulnerable system.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 9129 through 9131.

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 Nov 16, 2006



VRT Rules 2006-11-14

Sourcefire VRT Update

Date: 2006-11-14

Synopsis:

The Sourcefire VRT is aware of multiple vulnerabilities affecting systems using the Microsoft Windows Operating System some of which could allow an attacker to execute code or cause a Denial of Service (DoS) on an affected system.

Details:

Microsoft Security Bulletin MS06-067:
Mulitple vulnerabilities exist in the way that Microsoft Internet Explorer handles ActiveX controls. It may be possible for a remote attacker to execute code of their choosing on an affected system via Internet Explorer.

Rules to detect attacks targeting these vulnerabilities are included in this rule pack and are identified as sids 8741 through 8845.

A rule to detect attacks targeting this vulnerability was also released on September 1st 2006 and is identified as sid 8053. Additionally, sid 7009 released on July 6, 2006 may also generate events indicating possible exploit attempts relating to this vulnerability.

Microsoft Security Bulletin MS06-068:
Microsoft Agent fails to correctly process a malformed HTTP character file (.ACF). Sucessful exploitation of this vulnerability may allow an attacker to execute code of their choosing on an affected system.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 8846 through 8856.

Additionally, sid 4172 released on September 19, 2005 may also generate events indicating possible exploit attempts relating to this vulnerability.

Microsoft Security Bulletin MS06-069:
Macromedia Flash Player suffers from several vulnerabilities that may allow an attacker to execute code of their choosing on an affected system.

A rule to detect attacks targeting this vulnerability was released on July 13, 2006 and is identified as sid 7025.

Microsoft Security Bulletin MS06-070:
The Microsoft Workstation Service is prone to a buffer overflow vulnerability that 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 rule pack and are identified as sids 9027 through 9128.

Microsoft Security Bulletin MS06-071:
Microsoft systems using the XMLHTTP 4.0 ActiveX control may be prone to a vulnerability that could allow a remote attacker to execute code of their choosing on that host.

Rules to detect attacks targeting this vulnerability were released on November 6, 2006 and are identified as sids 8727 and 8728.

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 Nov 14, 2006



VRT Rules 2006-11-06

Sourcefire VRT Update

Date: 2006-11-06

Synopsis:

The Sourcefire VRT is aware of multiple vulnerabilities affecting systems using the Microsoft Windows Operating System some of which could allow an attacker to execute code or cause a Denial of Service (DoS) on an affected system.

Details:

Microsoft Security Advisory (927892)
Microsoft systems using the XMLHTTP 4.0 ActiveX control may be prone to a vulnerability that could allow a remote attacker to execute code of their choosing on that host.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 8727 and 8728.

Microsoft Windows NAT Helper DoS CVE-2006-5614:
Microsoft Windows systems suffer from a programming error that may allow a remote attacker to cause a Denial of Service attack against affected systems. The problem lies in the processing of DNS records on machines that are acting as Internet gateways which also perform Network Address Translation (NAT). When an affected host receives a malformed DNS query the system is unable to process the request and a DoS condition arises.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 8709 and 8710.

Microsoft Security Advisory (927709) CVE-2006-4446:

The Microsoft ActiveX control for the WMI Object Broker bypasses ActiveX security controls on some systems. This may allow an attacker to execute code of their choosing on an affected system.

A rule to detect attacks targeting this vulnerability was released on September 1st 2006 and is identified as sid 8053.

The Sourcefire VRT has also added and modified multiple rules as a result of continuing research into multiple 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 the network security industry.

Posted by on Nov 06, 2006



VRT Rules 2006-10-18

Sourcefire VRT Update

Date: 2006-10-18

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. The VRT has also updated numerous rules in the FTP category to accommodate larger default values for FTP services, additionally reference information has been added and improved throughout the VRT Certified Rule Set.

Details:

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

A number of rules in the FTP rule category have been updated to accommodate larger default values in some FTP services.

The VRT has also updated and added reference information throughout the entire Sourcefire VRT Certified Rule Set.

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 Oct 18, 2006



VRT Rules 2006-10-11

Sourcefire VRT Update

Date: 2006-10-11

Synopsis:

Microsoft has released a number of bulletins regarding vulnerabilities in its products, the Sourcefire VRT has continued research into these issues and has released additional rules to complement previously released rules.

Additionally, multiple reference updates have been made throughout the VRT Certified Ruleset.

Details:

Microsoft Security Bulletin MS06-065:
The Microsoft Windows Object Packager does not correctly process file names. This may allow a remote attacker to execute code of their choosing via a malformed file.

A rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 8445.

Microsoft Security Bulletin MS06-059:
Microsoft Excel for the Macintosh operating system contains a vulnerability that may allow a remote attacker to execute code of their choosing on an affected system via the use of a malformed COLINFO record in an xls file. This vulnerability also affects the Microsoft Excel Viewer.

A rule to detect attacks against this vulnerability is included in this rule pack and is identified as sid 8448.

Microsoft Security Bulletin MS06-063:
The Microsoft Operating System is prone to a vulnerability that may allow a remote attacker to cause a Denial of Service (DoS) on an affected system. The vulnerability occurs when the system attempts to process a malformed SMB RENAME command.

Rules to detect attacks targeting this vulnerability are included in this rule pack and are identified as sids 8449 through 8460.

The mailslot service is used on hosts using the Microsoft Operating System to handle messages between hosts on a domain.

An unchecked buffer in the mailslot server service may allow an attacker to overflow a fixed length buffer and execute code of their choosing on an affected host.

Rules to detect attacks targeting this vulnerability were previously released and are identified as sids 7035 through 7046.

Microsoft Security Bulletin MS06-056:
The Microsoft .NET Framework is vulnerable to a cross site scripting vulnerability that may allow remote attackers to access sensitive information.

Rules to detect attacks targeting this vulnerability were previously released and are identified as sids 1497 and 7070.

Microsoft Security Bulletin MS06-057:
Multiple vulnerabilities exist in the way that Microsoft Internet Explorer handles ActiveX controls. It may be possible for an attacker to execute code of their choosing on a system using Internet Explorer.

Rules to detect attacks targeting this vulnerability were previously released and are identified as sids 7985 through 7988 and sid 8419.

Microsoft Security Bulletins MS06-058, MS06-059 and MS06-060:
Microsoft Office products (Word, Excel and Powerpoint) are prone to vulnerabilities that may allow an attacker to execute code of their choosing on an affected host via a malformed file.

The OfficeCat tool, previously released by the Sourcefire VRT, is able to process these files to determine if possible exploit conditions exist in an Office document.

Note:
All previously released rules are contained in the latest rule pack, it is not necessary to install prior rule packs to get the relevant rules mentioned in this advisory.

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 Oct 11, 2006



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