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Vulnerability Alert

Cisco Adaptive Security Appliance Software Remote Access VPN Authentication Bypass Vulnerability

 
Threat Type:CWE-264: Permissions, Privileges, and Access Control
IntelliShield ID:31102
Version:1
First Published:2013 October 09 16:19 GMT
Last Published:2013 October 09 16:19 GMT
Port: Not available
CVE:CVE-2013-5510
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.1
 
Version Summary:Cisco Adaptive Security Appliance Software contains a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions and gain unauthorized access to a device. Updates are available.
 
 
Description
A vulnerability in the authentication code of the remote access VPN feature of Cisco ASA Software could allow an unauthenticated, remote attacker to bypass the remote VPN authentication, which could allow remote access to the inside network.

The vulnerability is due to improper parsing of the LDAP response packet received from a remote AAA LDAP server when the override-account-disable option is configured in the general-attributes of the tunnel-group. An attacker could exploit this vulnerability by attempting to authenticate via remote VPN to the affected system. An exploit could allow the attacker to bypass the authentication and gain access to the network via remote VPN.

Cisco has confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco Adaptive Security Appliance Software versions prior to 7.2(5.12), 8.2(5.46), 8.3(2.39), 8.4(6.6), 8.6(1.12), 9.0(2.6)1, and 9.1(2) are vulnerable.
 
IntelliShield Analysis
Only devices configured to allow Clientless or AnyConnect SSL VPN remote access and authenticate via a remote LDAP server are vulnerable, reducing the potential for exploitation.
 
Vendor Announcements
Cisco has released a security advisory for Cisco bug ID CSCug83401 at the following link: cisco-sa-20131009-asa
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to gain unauthorized access to a targeted device.
 
Technical Information
The vulnerability is due to improper processing of LDAP response packets.

An unauthenticated, remote attacker could exploit this vulnerability by authenticating via VPN to a targeted device. The improper processing of response packets could allow the attacker to bypass authentication and gain unauthorized access to a targeted device.
 
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 7.0 .1.4, .1, .2, .3, .4, .4.2, .5, .5.12, .6, .6.4, .6.8, .6.18, .6.22, .6.26, .6.29, .6.32, .7, .7.1, .7.4, .7.9, .7.12, .8, .8.2, .8.8, .8.12, .8.13 | 7.1 .2, .2.16, .2.20, .2.24, .2.28, .2.38, .2.42, .2.46, .2.49, .2.53, .2.61, .2.64, .2.72, .2.81 | 7.2 .1, .1.9, .1.13, .1.19, .1.24, .2, .2.6, .2.10, .2.14, .2.18, .2.19, .2.22, .2.34, .3, .3.1, .3.12, .3.16, .4, .4.6, .4.9, .4.18, .4.25, .4.27, .4.30, .4.33, .5, .5.2, .5.4, .5.7, .5.8, .5.10 | 8.0 .1.2, .2, .2.11, .2.15, .3, .3.6, .3.12, .3.19, .4, .4.3, .4.9, .4.16, .4.23, .4.25, .4.28, .4.31, .4.32, .4.33, .5, .5.20, .5.23, .5.25, .5.27, .5.28, .5.31 | 8.1 .1, .1.6, .2, .2.13, .2.15, .2.16, .2.19, .2.23, .2.24, .2.49, .2.50, .2.55, .2.56 | 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 | 8.3 .1, .1.1, .1.4, .1.6, .2, .2.4, .2.13, .2.23, .2.25, .2.31, .2.33, .2.34, .2.37 | 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 | 8.6 .1, .1.1, .1.2, .1.5, .1.10 | 9.0 .1, .2, .2.10, .3 | 9.1 .1, .1.4, .2

Associated Products:
N/A




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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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