Cisco Security Advisory
Click Icon to Copy Verbose Score
AV:N/AC:L/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
-
A vulnerability in the Internet Security Association and Key Management Protocol (ISAKMP) implementation in Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to enumerate remote access VPN groups configured in a Cisco ASA device.
The vulnerability is due to differences in the way Cisco ASA Software responds to Internet Key Exchange (IKE) aggressive mode messages when valid and invalid VPN groups are provided in the AM1 message. An attacker could exploit this vulnerability by sending crafted IKE messages to a Cisco ASA device that is configured as a VPN headend.
This vulnerability was discovered by Daniel Turner of Trustwave SpiderLabs. Cisco would like to thank Trustwave SpiderLabs for reporting this issue and working with us toward coordinated disclosure of this vulnerability.
Cisco has confirmed the vulnerability in a security notice and software updates are available.
To exploit the vulnerability, an attacker may need access to trusted, internal networks to send crafted IKE messages to the targeted system. This access requirement may reduce the likelihood of a successful attack.
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.
-
Cisco has released a security notice for bug ID CSCue73708 at the following link: CVE-2013-1194
Vulnerable Products
At the time this alert was first published, Cisco ASA Software versions 9.1.2 and prior were vulnerable. Later versions of Cisco ASA Software may also be affected.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
-
Administrators are advised to apply the appropriate updates.
It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and denial of service attacks. For configuration details, consult Protecting Your Core: Infrastructure Protection Access Control Lists.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
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.
-
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com for assistance.
-
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.
-
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.
-
Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2013-Apr-18
-
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy, and may lack important information or contain factual errors. The information in this document is intended for end-users of Cisco products.