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Vulnerability Alert

Cisco Adaptive Security Appliance Phone Proxy CTL Authentication Vulnerability

 
Threat Type:CWE-287: Authentication Issues
IntelliShield ID:32956
Version:1
First Published:2014 February 21 15:36 GMT
Last Published:2014 February 21 15:36 GMT
Port: Not available
CVE:CVE-2014-0738
BugTraq ID:65708
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Harassment
CVSS Base:4.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.1
Related Resources:
View related Security Notice
 
 
Version Summary:Cisco Adaptive Security Appliance contains a vulnerability that could allow an unauthenticated, remote attacker to modify the trust of the Certificate Trust List of a remote IP phone. Updates are not available.
 
 
Description
A vulnerability in the Phone Proxy function of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to modify the trust of the Certificate Trust List (CTL) of a remote IP phone.

The vulnerability is due to insufficient authentication of the CTL file. An attacker could exploit this vulnerability by injecting a modified CTL file to the phone proxy. An exploit could allow the attacker to impact the entities trusted by the IP phone.

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 versions 9.1(.3) and prior were vulnerable. Later releases of Cisco ASA may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may require access to trusted, internal networks to inject a modified CTL file to the phone proxy of an affected device. 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-2014-0738

Customers are advised to consult Cisco bug ID CSCuj66770 for a complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to modify the trust of the CTL of a remote IP phone, which could impact the entities trusted by the phone.
 
Technical Information
The vulnerability is due to insufficient authentication of the CTL file on an affected device.

An unauthenticated, remote attacker could exploit this vulnerability by injecting a modified CTL file to the phone proxy. An exploit could allow the attacker to impact the entities trusted by the IP phone.
 
Safeguards
Administrators are advised to contact the vendor regarding future updates and releases.

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

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

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 Adaptive Security Appliance (ASA) Software 9.1 .1, .1.4, .2, .2.8, .3

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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