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 Simple Network Management Protocol (SNMP) module of Cisco IOS XR Software could allow an authenticated, remote attacker to cause a reload of the SNMP process on an affected device.
The vulnerability is due to improper processing of SNMP requests for certain MIBs. An attacker could exploit this vulnerability by sending an SNMP request for certain MIB objects. An exploit could allow the attacker to cause a reload of the SNMP process on an 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 Releases 4.3(.2) and 5.1 and were vulnerable. Later releases of Cisco IOS XR Software may also be vulnerable.
To exploit this vulnerability, the attacker must authenticate to the targeted device. This access requirement may reduce 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-2013-6700
Customers are advised to consult Cisco bug ID CSCuh43144 for the most complete list of affected product versions.
An authenticated, remote attacker could exploit this vulnerability to cause the SNMP process on an affected device to reload, resulting in a denial of service (DoS) condition.
The vulnerability is due to improper processing of SNMP requests for certain MIBs by the SNMP module of the affected software.
An attacker could exploit this vulnerability by sending an SNMP request for certain MIB objects. An exploit could allow the attacker to cause a reload of the SNMP process on an affected device, 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 email at email@example.com for assistance.
The security vulnerability applies to the following combinations of products.
Cisco IOS XR Software
4.3 .2 | 5.1 Base
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the
Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service.
This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.
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.