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 could allow an authenticated, remote attacker to trigger a memory leak in the SNMP process.
The vulnerability is due to insufficient checking of data input. An attacker could exploit this vulnerability by sending crafted SNMP packets to the device. An exploit could allow the attacker to cause a memory leak in the SNMP process. The SNMP process will restart after it consumes its allocated memory.
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 this vulnerability, the attacker must authenticate to a targeted device to send crafted SNMP packets. This access requirement limits the possibility of a successful exploit.
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.
An authenticated, remote attacker could exploit this vulnerability to trigger a memory leak in the SNMP process, causing the process to restart after it consumes its allocated memory and resulting in a denial of service (DoS) condition.
The vulnerability is due to insufficient validation of user-supplied input processed by the affected software.
An authenticated, remote attacker could exploit this vulnerability by sending crafted SNMP packets to a targeted system. If successful, the attacker could trigger a memory leak in the SNMP process, which could cause the process to restart after it consumes its allocated memory and result in a DoS condition.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only privileged users to access administration or management 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 email@example.com 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.