Vulnerability Alert

Cisco MDS 9000 NX-OS Software Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:31663
Version:1
First Published:2013 November 06 20:30 GMT
Last Published:2013 November 06 20:30 GMT
Port: Not available
CVE:CVE-2013-5566
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 MDS 9000 NX-OS 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 supervisor of the Cisco MDS Family could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to improper handling of Virtual Router Redundancy Protocol (VRRP) frames. An attacker could exploit this vulnerability by sending a VRRP frame with Authentication Header (AH) authentication. An exploit could allow an attacker to drive CPU utilization over 90 percent, causing the supervisor to be slow to respond. The CPU does not recover until the VRRP service is restarted via a system switchover or restart.

Cisco has confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
At the time this alert was first published, Cisco MDS 9000 NX-OS Software Releases 5.0 and prior were vulnerable. Later releases of Cisco MDS 9000 NX-OS Software may also be vulnerable.
 
IntelliShield Analysis
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-2013-5566

Customers are advised to consult Cisco bug ID CSCte27874 for the most complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to consume excessive CPU resources on an affected device, resulting in a DoS condition.
 
Technical Information
The vulnerability is due to improper handling of VRRP frames by the supervisor component of the affected software.

An attacker could exploit this vulnerability by sending a VRRP frame with AH authentication. An exploit could allow an attacker to use a large amount of CPU resources, which could cause the supervisor to be slow to respond, 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.

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 MDS 9000 NX-OS Software 2.1 Base | 3.0 Base | 3.2 Base | 4.1 Base, (1b), (1c), (3a) | 4.2 Base, (1a), (1b), (3) | 5.0 Base

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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