Cisco has released a patch that addresses a TACACS+ Authentication Bypass vulnerability.    Exploitation is likely very easy.   If you are using Cisco ACS for authentication you should probably take note of this annoucment.

The following Cisco Secure ACS versions are affected by this vulnerability:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20121107-acs

Thanks to the ISC reader who asked not to be mentioned by name who brought this to my attention.  And thanks to Scott for keeping me straight on the versions.

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Mark Baggett