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Vulnerability Alert

Cisco Adaptive Security Appliance Software Crafted Certificate Validation Denial of Service Vulnerability

 
Threat Type:CWE: Design Error
IntelliShield ID:28514
Version:1
First Published:2013 April 10 16:20 GMT
Last Published:2013 April 10 16:20 GMT
Port: Not available
CVE:CVE-2013-1151
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 Adaptive Security Appliance (ASA) Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in the implementation of the function used to validate digital certificates for authentication could allow an unauthenticated, remote attacker to cause a reload of an affected device.

This vulnerability is due to an implementation error in the code that validates the digital certificates used during authentication. An attacker could exploit this vulnerability by using a crafted certificate to trigger an authentication operation on an affected device.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
The following releases of Cisco ASA Software are affected by this vulnerability:
  • Cisco ASA Releases prior to 7.2(5.10)
  • Cisco ASA Releases prior to 8.0(5.31)
  • Cisco ASA Releases prior to 8.2(5.38)
  • Cisco ASA Releases prior to 8.3(2.37)
  • Cisco ASA Releases prior to 8.4(5)
  • Cisco ASA Releases prior to 8.5(1.17)
  • Cisco ASA Releases prior to 8.6(1.10)
  • Cisco ASA Releases prior to 8.7(1.3)
 
IntelliShield Analysis
To exploit this vulnerability, an attacker would need to send a crafted certificate to trigger an authentication operation on an affected device. In a typical network configuration, such devices are placed on trusted, internal networks. This access requirement could limit the possibility 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 CSCuc72408 at the following link: cisco-sa-20130410-asa
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause the targeted device to reload, resulting in a denial of service (DoS) condition. Repeated exploitation could result in a sustained DoS condition.
 
Technical Information
The vulnerability is due to an implementation error in the affected software that validates digital certificates used during authentication.

An unauthenticated, remote attacker could exploit this vulnerability by using a crafted certificate to trigger an authentication operation on a targeted device. Successful exploitation could cause the affected device to reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.

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 Adaptive Security Appliance (ASA) Software 8.2 .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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