IntelliShield has updated this alert to add affected versions of Cisco IOS Software that could allow an unauthenticated, remote attacker to cause a denial of service condition.
A vulnerability in Cisco Catalyst 6500 Supervisor Engine 2T (Sup2T) could allow an unauthenticated, remote attacker to crash the device.
The vulnerability is due to incorrect processing multicast traffic by the Sup2T. An attacker could exploit this vulnerability by sending crafted packets to the router to cause a denial of service (DoS) condition.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco IOS Software Releases 15.1(1)SY and 15.1(1)SY1 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 packets to the targeted device. This access requirement decreases the likelihood 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-2014-2124
Customers are advised to consult Cisco bug ID CSCuf60783 for the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to cause an affected device to crash, resulting in a DoS condition.
The vulnerability is due to incorrect processing multicast traffic by the Sup2T of an affected device.
An unauthenticated, remote attacker could exploit this vulnerability by sending crafted packets to a targeted device. Processing the crafted packets could cause the device to crash, resulting in a DoS condition.
Administrators are advised to apply the appropriate updates.
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.
Version 1, March 19, 2014, 6:38 PM: Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
The security vulnerability applies to the following combinations of products.
15.1SY 15.1(1)SY, 15.1(1)SY1
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.