Vulnerability Alert

Cisco Adaptive Security Appliance Software DNS Inspection Denial of Service Vulnerability

 
Threat Type:CWE: Design Error
IntelliShield ID:28515
Version:1
First Published:2013 April 10 16:15 GMT
Last Published:2013 April 10 16:15 GMT
Port: Not available
CVE:CVE-2013-1152
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
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 DNS inspection engine code of Cisco ASA Software could allow an unauthenticated, remote attacker to trigger a reload of the affected device.

This vulnerability is due to improper processing of some fields in DNS messages. An attacker could exploit this vulnerability by sending a crafted DNS message that triggers inspection by an affected device.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco ASA Software versions prior to 9.0(1.2) are affected.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker would need to send crafted DNS messages through the targeted 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 CSCuc80080 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 improper processing of certain DNS messages processed by the DNS inspection engine of the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted DNS message through an affected device. Processing the crafted DNS message could trigger 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 may consider disabling DNS inspection if this feature is not needed.

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 9.0 .1, .2

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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