Cisco IOS XR Software contains a vulnerability that could allow an authenticated, remote attacker to cause a denial of service condition. Updates are available.
A vulnerability in the SNMP module of Cisco IOS XR Software could allow an authenticated, remote attacker to cause the SNMP process to restart.
The vulnerability is due to improper processing of crafted SNMP packets. An attacker could exploit this vulnerability by sending crafted SNMP packets to the affected device. An exploit could allow the attacker to cause the SNMP process to restart.
Cisco has confirmed the vulnerability in a security notice and software updates are available.
At the time this alert was first published, Cisco IOS XR Software versions 4.3 and prior were vulnerable. Later versions of Cisco IOS XR Software may also be affected.
To exploit the vulnerability, an attacker would likely need access to a trusted, internal network to send crafted SNMP packets to the targeted system. In addition, an attacker must authenticate to the targeted device. These access requirements may reduce the likelihood of a successful attack.
Customers are advised to review the bug reports 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.
An authenticated, remote attacker could exploit this vulnerability to cause the SNMP process running on an affected device to restart, resulting in a DoS condition.
The vulnerability is due to improper processing of crafted SNMP packets by the SNMP module of the affected software.
An authenticated, remote attacker could exploit this vulnerability by sending crafted SNMP packets to an affected device. If successful, the attacker could cause the SNMP process to restart, 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.
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 firstname.lastname@example.org for assistance.
The security vulnerability applies to the following combinations of products.
Cisco IOS XR Software
4.2 .0, .1, .2, .3, .4 | 4.3 .0
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.