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Cisco Security Advisory: Cisco Firewall Services Module Cut-Through Proxy Denial of Service Vulnerability

Advisory ID: cisco-sa-20140219-fwsm

Revision 1.0

For Public Release 2014 February 19 16:00 UTC (GMT)

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Summary
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Cisco Firewall Services Module (FWSM) Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a reload of an affected system.

The vulnerability is due to a race condition when releasing the memory allocated by the cut-through proxy function. An attacker could exploit this vulnerability by sending traffic to match the condition that triggers cut-through proxy authentication.

Cisco has released free software updates that address this vulnerability. Workarounds that mitigate the vulnerability are not available. This advisory is available at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140219-fwsm

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