VRT Advisories

VRT Rules 2005-08-18

Sourcefire VRT Certified Rules Update

Date: 2005-08-18


The Sourcefire Vulnerability Research Team (VRT) has learned of serious vulnerabilities affecting Veritas Backup Agent for Windows and Novell ZenWorks.


A vulnerability exists in Veritas Backup Exec Agent for Windows. This software uses Network Data Management Protocol (NDMP) to communicate between clients and servers. Authentication is required to successfully connect. A default user and MD-5 password hash can be used when MD-5 authentication is selected for a NDPM CONNECT_CLIENT_AUTH command to the server.

A Rule to provide coverage against attacks targeting this vulnerability is included in this rule pack and is identified as sid 4126.

Novell ZenWorks Remote Management Agent suffers from a programming error that may allow a remote and unauthenticated attacker to access memory space to the extent that it may be possible to execute code of their choosing and take control of a vulnerable system.

Rules to provide coverage against attacks targeting this vulnerability are included in this rule pack and are identified as sids 4129 and 4130.

Note: In order to use the Novell ZenWorks rules correctly, port 1761 must be added to the stream4_reassemble line in the snort configuration file.

To add port 1761 to the TCP reassembly configuration:

  1. Open the snort.conf file in a text editor
  2. Move to the line containing "preprocessor stream4_reassemble"
  3. Replace the line with the following:
    preprocessor stream4_reassemble: clientonly, ports 21 23 25 53 80 110 111 139 143 445 513 1433 1761
  4. Save the configuration
  5. Restart Snort

Rule Pack Summary:

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


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 network security industry.