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Vulnerability Alert

Cisco Adaptive Security Appliance Software Digital Certificate Authentication Bypass Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:31101
Version:1
First Published:2013 October 09 16:17 GMT
Last Published:2013 October 09 16:17 GMT
Port: Not available
CVE:CVE-2013-5509
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:10.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:8.3
Related Resources:
View related Security AdvisoryView related Security Notice
 
 
Version Summary:Cisco Adaptive Security Appliance Software contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions and gain unauthorized access to a device. Updates are available.
 
 
Description
A vulnerability in the code for SSL certificate validation of the Cisco ASA Software could allow an unauthenticated, remote attacker to bypass the certificate authentication.

The vulnerability is due to an error in handling a client crafted certificate during the authentication phase. An attacker could exploit this vulnerability by trying to authenticate to the affected system using a crafted certificate. An exploit could allow the attacker to bypass the certificate authentication. Depending on the Cisco ASA configuration, this may allow the attacker to authenticate and access the network via Clientless or Anyconnect SSL VPN or to get administrative management access via Cisco Adaptive Security Device Management (ASDM).

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco Adaptive Security Appliance Software versions prior to 9.0(2.6)1 and 9.1(2) are vulnerable.
 
IntelliShield Analysis
Only devices configured to allow client digital certification authentication are vulnerable to exploitation. In addition, only attackers who can establish a direct connection to a vulnerable device could conduct an exploit. These requirements greatly reduce the chance for exploitation.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCuf52468 at the following link: cisco-sa-20131009-asa
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to gain unauthorized access to a targeted device.
 
Technical Information
This vulnerability is due to improper validation of client digital certificates.

An unauthenticated, remote attacker could exploit this vulnerability by connecting to a vulnerable device using a crafted digital certificate. The improper processing of the certificate could allow the attacker to bypass authentication requirements and gained unauthorized access to the targeted device.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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 Adaptive Security Appliance (ASA) Software 9.0 .1, .2 | 9.1 .1, .1.4

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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