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Vulnerability Alert

Cisco ASA Adaptive Security Appliance Software and Cisco ASA Services Module Software SIP Inspection Media Update Denial of Service Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:27106
Version:1
First Published:2012 October 10 16:14 GMT
Last Published:2012 October 10 16:14 GMT
Port: Not available
CVE:CVE-2012-4660
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
Related Resources:
View related Security Advisory
 
 
Version Summary:Cisco ASA Adaptive Security Appliance Software and Cisco ASA Services Module Software contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device. Updates are available.
 
 
Description
Cisco ASA Adaptive Security Appliance (ASA) Software and Cisco ASA Services Module (ASASM) Software contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to improper processing of Session Initiation Protocol (SIP) media update packets. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted SIP packet through the affected device. Successful exploitation could allow the attacker to cause the targeted device to reload. Sustained attacks could result in a DoS condition.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco ASA Software and Cisco ASASM Software Releases prior to the following are vulnerable.
  • 8.2(5.16)
  • 8.3(2.28)
  • 8.4(2.12)
  • 8.5(1.4)
  • 8.6(1.4)
 
IntelliShield Analysis
To exploit the vulnerability, the attacker must send malicious requests to the targeted system, likely requiring the attacker to have access to trusted internal networks. This access requirement limits the likelihood of a successful exploit.

Only IPv4 and IPv6 transit traffic can be used to exploit this vulnerability. This vulnerability affects both routed and transparent firewall modes in both single and multicontext modes.

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 CSCtr63728 at the following link: cisco-sa-20121010-asa
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause the targeted device to reload. Sustained attacks could result in a DoS condition.
 
Technical Information
The vulnerability exists in the implementation of the SIP inspection engine code in the affected software. The vulnerability is due to improper processing of SIP media update packets.

An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted SIP packet as part of an established SIP inspection session through the affected device. When the affected software processes the malicious SIP packet, an error condition could allow the attacker to cause the targeted device to reload. Sustained attacks could result 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 using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

Administrators are advised to monitor critical 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 Appliances Firmware (ASA) 8.2 .0.45, .1, .1.11, .2, .2.9, .2.10, .2.12, .2.16, .3, .4, .4.1, .4.4, .5, .5.13 | 8.3 .1, .1.1, .1.4, .1.6, .2, .2.4, .2.13, .2.23, .2.25 | 8.4 Base, .1, .1.3, .1.11, .2, .2.8 | 8.5 Base, .1, .1.1

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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