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Cisco IOS XR Software Malformed MPLS Packet Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:35776
Version:1
First Published:2014 September 19 17:51 GMT
Last Published:2014 September 19 17:51 GMT
Port: Not available
CVE:CVE-2014-3379
BugTraq ID:69960
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:6.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.3
 
 
Version Summary:Cisco IOS XR Software contains a vulnerability that could allow an unauthenticated, adjacent attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in parsing of malformed Multiprotocol Label Switching (MPLS) packets in Cisco IOS XR Software for Cisco Network Convergence System 6000 Series Routers could allow an unauthenticated, adjacent attacker to cause a lockup and eventual reload of a network processor unit (NPU) and a line card that is processing traffic. 

The vulnerability is due to insufficient logic in parsing MPLS packets. An attacker could exploit this vulnerability by sending a malformed MPLS packet to be processed by the affected device. An exploit could allow the attacker to cause a lockup and eventual reload of a network processor unit and a line card, leading to a denial of service (DoS) condition.

Cisco has confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
At the time this alert was first published, Cisco IOS XR Software version 5.1 and prior were vulnerable. Later releases of Cisco IOS XR Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must have access to the same broadcast or collision domain as the targeted device. This access requirement decreases the likelihood of a successful exploit. In addition, the targeted device must be configured to process MPLS packets, which may require the attacker to obtain additional knowledge about the device prior to an exploit attempt.
 
Vendor Announcements
Cisco has released a security notice at the following link: CVE-2014-3379

Customers are advised to consult Cisco bug ID CSCuq10466 for a complete list of affected product versions.
 
Impact
An unauthenticated, adjacent attacker could exploit this vulnerability to cause a lockup and eventual reload of a network processor unit and a line card on an affected device, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper parsing of MPLS packets by a device running an affected version of Cisco IOS XR Software.

An attacker could exploit this vulnerability by sending a malformed MPLS packet to a targeted device. Processing the malformed MPLS packet could allow the attacker to cause a lockup and eventual reload of a network processor unit and a line card on the device, leading to a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators are advised to monitor affected systems.
 
Patches/Software
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 tac@cisco.com for assistance.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco IOS XR Software 5.1 Base | for Cisco Network Convergence System 6000 Series Routers 5.0.0, 5.0.1

Associated Products:
N/A



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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