Cisco IOS XR 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 Routing Information Protocol (RIP) process of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause the RIP process to crash.
The vulnerability is due to insufficient input validations of the packet. An attacker could exploit this vulnerability by sending a crafted RIP version 2 packet. A successful exploit could allow the attacker to cause the RIP process to crash on the affected device.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco IOS XR Software versions 4.3 and prior were vulnerable. Later releases of Cisco IOS XR Software may also be vulnerable.
To exploit this vulnerability, an attacker may require access to trusted, internal networks to send crafted RIP version 2 packets to an affected device. This access requirement could limit 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-2013-3470
Customers are advised to consult Cisco bug ID CSCue46731 for the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to cause the RIP process on an affected device to crash, resulting in a DoS condition.
The vulnerability is due to insufficient validation of user-supplied input processed by the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by sending crafted RIP version 2 packets to an affected device. Processing the packets could cause the RIP process to crash, resulting in a DoS condition.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Understanding activity on the network provides information and visibility that can be used to identify potential security incidents. Organizations should log events from devices and review the logged data to provide insight into anomalies or malicious activity. For logging best practices, see Cisco Guide to Harden Cisco IOS Devices.
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 firstname.lastname@example.org for assistance.
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.