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Vulnerability Alert

Cisco IOS Software Sup2T Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:33413
Version:1
First Published:2014 March 19 22:38 GMT
Last Published:2014 March 19 22:38 GMT
Port: Not available
CVE:CVE-2014-2124
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.4 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.5
 
Version Summary:Cisco IOS 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 Cisco Catalyst 6500 Supervisor Engine 2T (Sup2T) could allow an unauthenticated, remote attacker to crash the device.

The vulnerability is due to incorrect processing multicast traffic by the Sup2T. An attacker could exploit this vulnerability by sending crafted packets to the router to cause 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 Software Releases 15.1(2)SY3 and prior were vulnerable. Later releases of Cisco IOS Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker may need access to trusted, internal networks to send crafted packets to the targeted device. This access requirement decreases 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-2014-2124

Customers are advised to consult Cisco bug ID CSCuf60783 for the most complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause an affected device to crash, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to incorrect processing multicast traffic by the Sup2T of an affected device.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted packets to a targeted device. Processing the crafted packets could cause the device to crash, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

Administrators are advised to monitor network traffic for security-related network activity. Cisco NetFlow can identify such activity. For more information about Cisco NetFlow, see Introduction to Cisco IOS NetFlow - A Technical Overview.

To mitigate DoS attacks, apply hardware rate limiter features to limit packets that require CPU processing. See vendor documentation for specific configuration instructions. For hardware rate limiting configuration details, see Cisco Catalyst 6500 Denial of Service (DoS) Protection Configuration Guide.
 
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 15.1SY 15.1(1)SY, 15.1(1)SY1, 15.1(1)SY2, 15.1(1)SY3, 15.1(2)SY, 15.1(2)SY1, 15.1(2)SY2, 15.1(2)SY3

Associated Products:
N/A




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.


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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