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Vulnerability Alert

Cisco Firewall Services Module HTTP Proxy Traceback Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:28516
Version:1
First Published:2013 April 10 16:14 GMT
Last Published:2013 April 10 16:14 GMT
Port: Not available
CVE:CVE-2013-1155
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
Related Resources:
View related Security Advisory
 
 
Version Summary:Cisco Firewall Services Module contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device. Updates are available.
 
 
Description
Cisco Firewall Services Module (FWSM) contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to improper URL handling by the affected software when processing client requests via the auth-proxy feature. An unauthenticated, remote attacker could exploit the vulnerability by submitting crafted URLs to a targeted device running the software. A successful exploit could allow the attacker to cause a DoS condition for legitimate users.

Cisco has confirmed the vulnerability in a security advisory and has released software updates.
 
Warning Indicators
Cisco FWSM Software versions 3.1, 3.2, 4.0, and 4.1 are affected.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send crafted requests to the affected software. In addition, a Cisco FWSM is affected by this vulnerability if the auth-proxy feature is enabled. This feature is not enabled by default. These requirements 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 CSCtg02624 at the following link: cisco-sa-20130410-fwsm
 
Impact
An unauthenticated, remote attacker could exploit the vulnerability to cause a DoS condition on a targeted device.
 
Technical Information
The vulnerability is due to improper URL handling when processing client requests via the auth-proxy feature of the affected software.

An unauthenticated, remote attacker could exploit the vulnerability by submitting crafted URLs to a targeted device running the affected software. When the software processes the malicious URL, the device could reload. A successful exploit could allow the attacker to cause the device to reload abnormally and deny service to legitimate users. Sustained attacks could result in an extended DoS condition.
 
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 e-mail 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) 3.2 Base, .1, .2, .3, .4, .5, .6, .7, .8, .9, .10, .11, .12, .13, .14, .15, .16, .17, .18, .19, .20 | 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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