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Vulnerability Alert

Cisco Adaptive Security Appliance Xlates Table Exhaustion Vulnerability

 
Threat Type:CWE: Design Error
IntelliShield ID:28382
Version:1
First Published:2013 February 26 15:52 GMT
Last Published:2013 February 26 15:52 GMT
Port: Not available
CVE:CVE-2013-1138
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.8
Related Resources:
View 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 not available.
 
 
Description
Cisco Adaptive Security Appliance (ASA) Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to the improper implementation of the Network Address Translation (NAT) process by the affected software. An unauthenticated, remote attacker could exploit this vulnerability by sending crafted packets to the targeted device. If successful, an attacker could cause a delay in new valid connections until the invalid entries expire, resulting in a DoS condition.

Cisco has confirmed the vulnerability; however, software updates are not available.
 
Warning Indicators
At the time this alert was first published, Cisco ASA Software versions 8.4.5 and prior were vulnerable. Later versions of Cisco ASA Software may also be affected.
 
IntelliShield Analysis
Customers are advised to review the bug report in the vendor announcements section for a current list of affected versions.

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 notice for bug ID CSCue46386 at the following link: CVE-2013-1138
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to consume part of the available memory allocated for the xlates table. As a result, new valid connections cannot be established until invalid entries expire, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to the improper implementation of the NAT process by the affected software. The incorrect handling of crafted packets could delay new connection entries to the xlates table used by the affected software from being established.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted packets to a targeted device. When processed, the crafted packets could allow the attacker to consume available memory allocated for the xlates table used by the affected software. If successful, the attacker could cause a delay in new valid connections until the invalid entries expire, resulting in a DoS condition.
 
Safeguards
Administrators are advised to contact the vendor regarding future updates and releases.

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

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

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
Software updates are not available.
 
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 Base, .1, .1.3, .1.11, .2, .2.8, .3, .3.8, .3.9, .4, .4.1, .4.3, .4.5, .4.9, .5

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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