Software Engineering Institute

Cisco voice products (e.g. CallManager, IP Interactive Voice Response, IP Call Center Express) that run on IBM servers install IBM Director agent to provide administrative management. There is a flaw in the way the IBM Director agent (twgipc.exe) handles arbitrary TCP packets to port 14247/tcp. A remote attacker could cause a denial-of-service condition by sending arbitrary TCP packets to the IBM Director agent on port 14247/tcp. This vulnerability could be exploited by port scanning an affected system.

A remote attacker could cause the IBM Director Agent to consume 100% of the CPU until the server is rebooted.

Upgrade

Quoting from Cisco's Advisory:
As the mitigation for the vulnerabilities is a repair script, a software upgrade is not required to address the vulnerabilities. However, if you have a service contract, and wish to upgrade to unaffected code, you may obtain upgraded software through your regular update channels once that software is available. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's Worldwide Web site at http://www.cisco.com.

Apply Cisco Repair Script

Cisco has provided a repair script as a workaround until an upgrade is available. The repair script is available from:

http://www.cisco.com/cgi-bin/tablebuild.pl/cmva-3des

Note: The URL above requires a valid Cisco Connection Online (CCO) user account.
Quoting from Cisco's Advisory:
Cisco's repair script adds 3 levels of improved security to the Director agent:

1. The Director agent no longer listens on TCP or UDP ports 14247 for remote connections from a Director Server. This change prevents the Denial of Service attacks described in the Impact section.

2. The repair script secures the Director agent such that even if port 14247 is reenabled, the Director agent still would not accept connections from any Director Server.