VRT Advisories

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VRT Tool 2007-08-01

Sourcefire VRT Tool Tool Update

Date: 2007-08-01

Synopsis:

The OfficeCat tool has been updated to address a possible issue when processing some documents.

Details:

The OfficeCat tool has been updated to address a possible issue when processing some documents.

Many thanks to James O'Connor of Symantec for actually using OfficeCat and finding the problem. We would like to hear from more people, we would like feature requests, post cards, bug reports and beer.

Please send feature requests and bug reports via email to vrt@sourcefire.com. Post cards and beer can be sent to the Sourcefire VRT, 9780 Patuxent Woods Drive, Columbia, MD 21045, USA.

Additionally, malware samples would be most appreciated, please contact vrt@sourcefire.com if you have some to share.

The OfficeCat tool is able to process Word, Excel and PowerPoint files and will return the appropriate reference information should possible exploit conditions be present in the document.

OfficeCat Tool Download:

Download zip archive here.

Usage Instructions:

  1. Unzip the archive
  2. Open a command shell
  3. Execute the tool executable with a document name for checking

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.

About Sourcefire

Sourcefire, Inc., the world leader in intrusion prevention, is transforming the way organizations manage and minimize network security risks with its 3D Approach - Discover, Determine, Defend - to securing real networks in real-time. For more information about Sourcefire, please visit www.sourcefire.com.

Posted by on Aug 01, 2007



VRT Rules 2007-07-31

Sourcefire VRT Rules Update

Date: 2007-07-31

Synopsis:

The Sourcefire VRT is aware of a vulnerability affecting hosts using Microsoft Excel. This release also includes additions to the spyware-put and backdoor rule categories.

Details:

Microsoft Security Bulletin MS07-036:
A memory corruption vulnerability exists in the way Microsoft Excel processes files. The vulnerability is a result of insufficient data validation while processing the Version field in a BOF record. A remote attacker can exploit this vulnerability by enticing the target user to open a crafted Excel file, potentially causing arbitrary code to be injected and executed in the security context of the current user.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12184.

In addition, as a result of ongoing research, the VRT has added rules to the backdoor and spyware-put rule categories.

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 Jul 31, 2007



VRT Rules 2007-07-24

Sourcefire VRT Rules Update

Date: 2007-07-24

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting hosts using Microsoft Excel, CA BrightStor and Kerberos kadmind.

Details:

Microsoft Security Bulletin MS07-036:
A memory corruption vulnerability exists in the way Microsoft Excel processes files. The vulnerability is a result of insufficient data validation while processing the Version field in a BOF record. A remote attacker can exploit this vulnerability by enticing the target user to open a crafted Excel file, potentially causing arbitrary code to be injected and executed in the security context of the current user.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12099.

CA BrightStor ARCserve Backup buffer overflow (CVE-2007-0449):
Multiple buffer overflows exist in CA BrightStor ARCserve Backup which may allow an 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 12078 and 12079.

MIT Kerberos kadmind uninitialized pointer (CVE-2007-2442):
The MIT Kerberos RPC library suffers from a programming error that may allow an attacker to execute code on a vulnerable system.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12075.

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 Jul 24, 2007



VRT Rules 2007-07-12

Sourcefire VRT Rules Update

Date: 2007-07-12

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting hosts using Microsoft Windows Active Directory and Microsoft Excel.

Details:

Microsoft Security Bulletin MS07-039:
A heap overflow vulnerability exists in the way Microsoft Windows Active Directory handles LDAP messages. The vulnerability is due to a lack of convertible attributes validation in client LDAP request messages. Remote unauthenticated attackers can exploit this vulnerability to inject and execute arbitrary code on the affected target with System level privileges.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12069.

Microsoft Security Bulletin MS07-036:
A memory corruption vulnerability exists in the way Microsoft Excel processes files. The vulnerability is a result of insufficient data validation while processing the Version field in a BOF record. A remote attacker can exploit this vulnerability by enticing the target user to open a crafted Excel file, potentially causing arbitrary code to be injected and executed in the security context of the current user.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12070.

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 Jul 12, 2007



VRT Rules 2007-07-10

Sourcefire VRT Rules Update

Date: 2007-07-10

Synopsis:

The Sourcefire VRT is aware of vulnerabilities affecting hosts using Microsoft IIS, Microsoft Windows Firewall and the Microsoft .NET Framework.

Details:

Microsoft Security Bulletin MS07-041:
Microsoft Internet Information Services (IIS) contains a programming error that may allow an attacker to execute code on a vulnerable system. The problem occurs in the processing of URLs, in that a malformed request may cause a null pointer dereference and present the attacker with the opportunity to execute code in the context of the user running the service.

A rule to detect attacks targeting this vulnerability is included in this release and is identified as SID 12064.

Microsoft Security Bulletin MS07-040:
The Microsoft .NET Framework suffers from a vulnerability that may allow a remote attacker to compromise a host using the Framework.

A previously released rule will detect attacks targeting this vulnerability and is identified as SID 11192.

Microsoft Security Bulletin MS07-038:
The Microsoft Windows Firewall fails to correctly handle IPv6 packets when tunnelled over UDP to traverse an IPv4 Network Address Translation. This may allow an attacker to initiate network communications with a host and bypass any Microsoft Windows based firewalls in the process.

Rules to detect attacks targeting this vulnerability are included in this release and are identified as SIDs 12065 through 12068.

Additionally, SID 8446 may also generate events on IPv6 traffic encapsulated in IPv4.

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 Jul 10, 2007



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