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Vulnerability Alert

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

 
Threat Type:CWE: Insufficient Information
IntelliShield ID:32837
Version:1
First Published:2014 February 19 16:24 GMT
Last Published:2014 February 19 16:24 GMT
Port: Not available
CVE:CVE-2014-0710
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.9
 
Version Summary:Cisco Firewall Services Module contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of server condition on a targeted system. Updates are available.
 
 
Description
A vulnerability in the cut-through proxy function of Cisco Firewall Services Module (FWSM) Software could allow an unauthenticated, remote attacker to cause a reload of the 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. An exploit could allow the attacker to trigger a reload of the affected system. Repeated exploitation could result in a denial of service (DoS) condition.

Cisco has confirmed the vulnerability in a security advisory and has released software updates.
 
Warning Indicators
Cisco Firewall Services Module versions 3.1, 3.2, 4.0, and 4.1 are affected.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may require access to trusted, internal networks to send crafted requests to the affected software. This access requirement could limit the likelihood of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security advisory for bug ID CSCuj16824 at the following link: cisco-sa-20140219-fwsm
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to trigger a reload of the affected system. Repeated exploitation could result in a DoS condition.
 
Technical Information
The vulnerability is due to a race condition when releasing the memory allocated by the cut-through proxy function of the Cisco FWSM.

An unauthenticated, remote attacker could exploit this vulnerability by sending IPv4 traffic crafted to match the condition that triggers cut-through proxy authentication to a targeted device. When the device processes the malicious traffic, the attacker could cause the device to reload abnormally. Repeated exploitation could cause a DoS condition for legitimate users.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco Firewall Services Module (FWSM) 3.1 Base, .1, .1(2), .1(3), .1(4), .1(5), .1(6), .1(7), .2, .3, .3(1), .3(3), .3(11), .3(18), .4, .5, .6, .7, .8, .9, .10, .11, .12, .13, .14, .15, .16, .17, .18, .19, .20 | 3.2 .21, .22, .23, .24, .25, .26, .27 | 4.0 .1, .2, .3, .6, .7, .8, .10, .11, .12, .13, .14, .15 | 4.1 Base, .1, .2, .3, .4, .5

Associated Products:
N/A




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LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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