Vulnerability Alert

Cisco IOS XR RIP Version 2 Crafted Packet Processing Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:30548
Version:1
First Published:2013 August 29 19:40 GMT
Last Published:2013 August 29 19:40 GMT
Port: Not available
CVE:CVE-2013-3470
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 IOS XR Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in the Routing Information Protocol (RIP) process of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause the RIP process to crash.

The vulnerability is due to insufficient input validations of the packet. An attacker could exploit this vulnerability by sending a crafted RIP version 2 packet. A successful exploit could allow the attacker to cause the RIP process to crash on the affected device.

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 versions 4.3 and prior were vulnerable. Later releases of Cisco IOS XR Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may require access to trusted, internal networks to send crafted RIP version 2 packets to an affected device. This access requirement could limit 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.
 
Vendor Announcements
Cisco has released a security notice at the following link: CVE-2013-3470

Customers are advised to consult Cisco bug ID CSCue46731 for the most complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause the RIP process on an affected device to crash, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to insufficient validation of user-supplied input processed by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted RIP version 2 packets to an affected device. Processing the packets could cause the RIP process to crash, resulting in 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 may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Understanding activity on the network provides information and visibility that can be used to identify potential security incidents. Organizations should log events from devices and review the logged data to provide insight into anomalies or malicious activity. For logging best practices, see Cisco Guide to Harden Cisco IOS Devices.

It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and denial of service attacks. For configuration details, see Protecting Your Core: Infrastructure Protection Access Control Lists.

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 3.3 .0, .1, .2, .3, .4 | 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, .2 | 4.0 Base, .0, .1, .2, .3, .4, .11 | 4.1 Base, .0, .1, .2 | 4.2 .0, .1, .2, .3, .4 | 4.3 .0

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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