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Vulnerability Alert

Cisco Adaptive Security Appliance AnyConnect SSL VPN Memory Exhaustion Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:31106
Version:1
First Published:2013 October 09 16:20 GMT
Last Published:2013 October 09 16:20 GMT
Port: Not available
CVE:CVE-2013-3415
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 AdvisoryView related Security Notice
 
 
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 how Cisco ASA Software handles AnyConnect SSL VPN client connections could allow an unauthenticated, remote attacker to exhaust available memory which could cause the affected system to become unresponsive and transit traffic to be dropped.

The vulnerability is due to improperly clearing unused memory blocks after an AnyConnect SSL VPN client disconnects. An attacker could exploit this vulnerability by sending traffic to the IP address of the disconnected client.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco Adaptive Security Appliance Software versions prior to 8.4(3) and  8.6(1.3) are affected.
 
IntelliShield Analysis
Only devices that have enabled AnyConnect SSL VPN features are vulnerable to exploitation.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCtt36737 at the following link: cisco-sa-20131009-asa
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to stop responding, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to improper memory operations when processing AnyConnect SSL VPN client connections.

An unauthenticated, remote attacker could exploit the vulnerability by attempting to establish an AnyConnect VPN connection to a targeted device. The improper handling of the connection could cause the device to fail to release memory resources. The exhaustion of available memory resources due to repeated VPN connections could cause the device to become unresponsive, resulting in a DoS condition.
 
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 8.4 .1, .1.3, .1.11, .2, .2.1, .2.8, .3 | 8.6 .1, .1.1, .1.2

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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