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Vulnerability Alert

Cisco IOS Software and IOS XE Software LISP Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:34233
Version:1
First Published:2014 May 14 19:29 GMT
Last Published:2014 May 14 19:29 GMT
Port: Not available
CVE:CVE-2014-3262
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.6
 
 
Version Summary:Cisco IOS Software and IOS XE Software contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
A vulnerability in Locator/ID Separation Protocol (LISP) control message processing in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a vulnerable device to disable Cisco Express Forwarding and eventually drop traffic passing through.

The vulnerability is due to insufficient checking of certain parameters in LISP control messages on the Ingress Tunnel Router (ITR). An attacker could exploit this vulnerability by sending malformed LISP control messages to the ITR. An exploit could allow the attacker to cause a vulnerable device to disable Cisco Express Forwarding and eventually drop traffic passing through.

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 Software Releases 15.3(3)S and prior were vulnerable. Later releases may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send malformed LISP control messages to a targeted device. This access requirement may reduce the possibility 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-2014-3262

Customers are advised to consult Cisco bug ID CSCun73782 for a complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause an affected device to disable Cisco Express Forwarding, which may drop traffic passing through the device, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to insufficient checking of certain parameters in LISP control messages on the ITR.

An unauthenticated, remote attacker could exploit this vulnerability by sending malformed LISP control messages to the ITR. An exploit could allow the attacker to cause a vulnerable device to disable Cisco Express Forwarding and eventually drop traffic passing through, 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.

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:
CiscoIOS 15.3M 15.3(3)M | 15.3S 15.3(3)S

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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