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Vulnerability Alert

Cisco IOS XR Software Border Gateway Protocol Attribute Processing Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:21266
Version:2
First Published:2010 August 28 00:01 GMT
Last Published:2010 September 01 18:13 GMT
Port: Not available
CVE:CVE-2010-3035
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.1
 
Version Summary:

Cisco has re-released the security advisory for the Cisco IOS XR Software Border Gateway Protocol attribute processing denial of service vulnerability to include updated software versions.

 
 
Description

Cisco IOS XR Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to errors in processing Border Gateway Protocol (BGP) route updates that contain unrecognized attributes.  An unauthenticated, remote attacker could exploit this vulnerability by sending malicious BGP routes to a targeted device.  When processed, the route updates could cause the device to distribute corrupted routes, causing devices that accept the corrupted routes to close BGP sessions, resulting in a DoS condition.

Cisco confirmed this vulnerability in a security update and software updates are available.

 
Warning Indicators

Cisco IOS XR Software versions 3.9.1 and prior are affected.

 
IntelliShield Analysis

To exploit this vulnerability, an attacker would have to send malicious BGP route updates to the targeted device.  Routers typically accept BGP route updates only from authorized BGP neighbors.  An attacker must send malicious routes to a targeted device from an approved peer or otherwise spoof the source of updates to make the targeted device accept a provided route update.  These access requirements greatly reduce the potential for exploitation.

The vulnerability was discovered during the implementation of an experimental BGP route update.  The event is documented in IntelliShield Alert 21265.

 
Vendor Announcements

Cisco has released a security advisory for Cisco bug ID CSCti62211 at the following link: cisco-sa-20100827-bgp

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to close established BGP sessions, resulting in a DoS condition.

 
Technical Information

The vulnerability is due to errors in processing BGP route updates that contain unrecognized attributes.  When processing the update, the Cisco IOS XR Software may corrupt the attribute before passing the route update to other peers.  As a result, BGP neighbors may reset an established BGP session.

An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious route update to the targeted device.  The attacker must send the route update from an authorized BGP neighbor, or otherwise spoof the source of the update, to force the targeted device to accept and process the update.  When processed, the route update may trigger the distribution of corrupted updates, resulting in a DoS condition.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to monitor affected systems for signs of exploitation.

 
Patches/Software

Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.

 
Alert History
 

Version 1, Aug 27, 2010, 8:01 PM: Cisco IOS XR Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition.  Updates are not available.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco IOS XR Software 3.4 .0, .1, .2, .3 | 3.5 .0, .2, .3, .4 | 3.6 Base, .1, .2, .3 | 3.7 Base, .1, .2, .3 | 3.8 .0, .1, .2, .3, .4 | 3.9 .0, .1

Associated Products:
N/A




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LEGAL DISCLAIMER
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.
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