Cisco IOS Software and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
A vulnerability in the Internet Key Exchange (IKE) module of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to delete established security associations on an affected device.
The vulnerability is due to improper handling of rogue IKE Main Mode packets. An attacker could exploit this vulnerability by sending a crafted IKE Main Mode packet to an affected device. An exploit could allow the attacker to cause valid, established IKE security associations on an affected device to drop.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco IOS Software 15.4(1)T and prior were vulnerable. Later releases of Cisco IOS Software may also be vulnerable.
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send crafted IKE Main Mode packets to a targeted device. This access requirement may reduce the possibility of a successful exploit.
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 at the following link: CVE-2014-2143
Customers are advised to consult Cisco bug ID CSCun31021 for the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to cause IKE security associations on an affected device to drop, resulting in a denial of service (DoS) condition.
The vulnerability is due to improper handling of rogue IKE Main Mode packets by a device running the affected software.
An attacker could exploit this vulnerability by sending a crafted IKE Main Mode packet to an affected device. An exploit could allow the attacker to cause valid, established IKE security associations on an affected device to drop, resulting in a DoS condition.
Administrators are advised to apply the appropriate updates.
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 email at email@example.com for assistance.
The security vulnerability applies to the following combinations of products.
15.4S 15.4(3)S | 15.4T 15.4(1)T
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.