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Category:   Device (Firewall)  >   Cisco Firewall Services Module Vendors:   Cisco
Cisco Firewall Services Module Flaw in Cut-Through Proxy Lets Remote Users Deny Service
SecurityTracker Alert ID:  1029784
SecurityTracker URL:  http://securitytracker.com/id/1029784
CVE Reference:   CVE-2014-0710   (Links to External Site)
Date:  Feb 19 2014
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.1, 3.2, 4.0, 4.1
Description:   A vulnerability was reported in Cisco Firewall Services Module. A remote user can cause denial of service conditions.

A remote user can send specially crafted data to trigger a memory allocation race condition in the cut-through proxy and cause the target device to reload. Data that matches the condition that triggers cut-through proxy authentication can trigger this condition.

The vendor has assigned bug ID CSCuj16824 to this vulnerability.

Impact:   A remote user can cause the target device to reload.
Solution:   The vendor has issued a fix (3.2(28), 4.1(15)).

The vendor's advisory is available at:

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

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140219-fwsm (Links to External Site)
Cause:   Access control error, State error

Message History:   None.


 Source Message Contents

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

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

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)

+---------------------------------------------------------------------

Summary
=======

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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