Cisco Security Advisory
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AV:N/AC:L/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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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.
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.
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Cisco has released a security advisory for Cisco bug ID CSCug83401 at the following link: cisco-sa-20131009-asa
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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.
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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.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2013-Oct-09
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