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Vulnerability Alert

Cisco ASA CX Safe Search Policy Bypass Vulnerability

 
Threat Type:CWE-16: Configuration
IntelliShield ID:31607
Version:1
First Published:2013 November 04 20:59 GMT
Last Published:2013 November 04 20:59 GMT
Port: Not available
CVE:CVE-2013-5561
BugTraq ID:63492
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.8
 
Version Summary:Cisco ASA CX Context-Aware Security Software contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions on a targeted device. Updates are not available.
 
 
Description
A vulnerability in the Safe Search enforcement component of Cisco ASA CX Context-Aware Security could allow an unauthenticated, remote attacker to bypass security policy enforced by the affected component.

The vulnerability is due to improper implementation of the logic that should perform the filtering action. An attacker could exploit this vulnerability by sending a crafted HTTP request through the affected system.

Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
 
Warning Indicators
At the time this alert was first published, Cisco ASA CX Context-Aware Security Software versions 9.0.2-68 and prior were vulnerable. Later releases of Cisco ASA CX Context-Aware Security Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must have the ability to send a crafted HTTP requests through a targeted device which may reside on trusted, internal networks in which the attacker would likely need access to. This access requirement decreases 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 notice at the following link: CVE-2013-5561

Customers are advised to consult Cisco bug ID CSCui94622 for the most complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to bypass security policy enforced by an affected device. A successful exploit could be used to conduct further attacks.
 
Technical Information
The vulnerability is due to improper implementation of the logic that should perform the filtering action on an affected device.

An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted HTTP request through the affected system. Processing the crafted HTTP request could allow an attacker to bypass security restrictions imposed by the Safe Search enforcement component used an affected device.
 
Safeguards
Administrators are advised to contact the vendor regarding future updates and releases.

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
Software updates are not available.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco ASA CX Context-Aware Security Software 9.0 Base, .1, .1-40, .2, .2-68

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


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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