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Vulnerability Alert

Cisco Adaptive Security Appliance SIP Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:33625
Version:1
First Published:2014 April 09 16:20 GMT
Last Published:2014 April 09 16:20 GMT
Port: Not available
CVE:CVE-2014-2129
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.9
Related Resources:
View related Security Advisory
 
 
Version Summary:Cisco Adaptive Security Appliance 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 SIP inspection engine code could allow an unauthenticated, remote attacker to exhaust available memory, which may cause instability or a reload of the affected system.

The vulnerability is due to improper handling of SIP packets inspected by the Cisco ASA SIP inspection engine. An attacker could exploit this vulnerability by sending crafted SIP packets through the affected system. An exploit could allow the attacker to cause the exhaustion of available memory. This may cause system instability and in some cases lead to a reload of the affected system, creating a denial of service condition.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
The following Cisco Adaptive Security Appliance (ASA) Software versions are affected:
  • Cisco ASA Software versions prior to 8.2(5.48)
  • Cisco ASA Software versions prior to 8.4(6.5)
  • Cisco ASA Software versions prior to 9.0(3.1)
  • Cisco ASA Software versions prior to 9.1(2.5)
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may need access to trusted, internal networks in which the targeted device would likely reside to send crafted SIP packets to be processed by the 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 advisory for Cisco bug ID CSCuh44052 at the following link: cisco-sa-20140409-asa
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause an affected device to consume excessive amounts of available memory resources that may cause the device to reload, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to improper handling of SIP packets inspected by the SIP inspection engine on a device running an affected version of Cisco ASA Software.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP packets through the affected system. An exploit could allow the attacker to cause the exhaustion of available memory. This may cause system instability and in some cases lead to a reload of the affected system, creating a denial of service 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 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 8.2 .0.45, .1, .1.11, .2, .2.9, .2.10, .2.12, .2.16, .2.17, .3, .4, .4.1, .4.4, .5, .5.13, .5.22, .5.26, .5.33, .5.40, .5.41, .5.46 | 8.4 .1, .1.3, .1.11, .2, .2.1, .2.8, .3, .3.8, .3.9, .4, .4.1, .4.3, .4.5, .4.9, .5, .5.6, .6 | 9.0 .1, .2, .2.10, .3 | 9.1 .1, .1.4, .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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