Vulnerability Alert

Cisco NX-OS Software Malformed IP Packet Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:25156
Version:2
First Published:2012 February 15 16:41 GMT
Last Published:2012 March 27 14:51 GMT
Port: Not available
CVE:CVE-2012-0352
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
 
Version Summary:

Cisco has re-released a security advisory and updated software to address the NX-OS software malformed IP packet denial of service vulnerability.

 
 
Description

Cisco NX-OS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is in the IP stack of the affected software and any feature that uses services offered by the IP stack to parse IP packets. The vulnerability occurs when the affected software attempts to obtain Layer 4 information of a malformed IP packet.  An unauthenticated, remote attacker could exploit this vulnerability by sending malformed IP packets through the targeted device.  If successful, the attacker could cause the device to stop responding, resulting in a DoS condition.

Cisco has confirmed this vulnerability in a security advisory and software updates are available.

 
Warning Indicators

The following versions of Cisco Nexus Series Switches are vulnerable when they are running affected versions of Cisco NX-OS Software.  The Vendor Announcements section of this alert contains a link to the advisory.

  • Cisco Nexus 1000v Series Switches
  • Cisco Nexus 1010 Series Switches
  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 7000 Series Switches
  • Cisco VSG for Nexus 1000V Series Switches
 
IntelliShield Analysis

A successful exploit could allow an attacker to cause a device to stop responding, potentially preventing authorized users from accessing network resources served by the targeted device.

A successful exploit does not affect all Cisco Nexus products.  Affected products are identified in the "Warning Indicators" section of this alert.

This alert contains CVSS scoring supplied by Cisco, the primary vendor of the affected product.  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 advisory for Cisco bug IDs CSCti23447, CSCti49507, and CSCtj01991 at the following link: cisco-sa-20120215-nxos

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to cause a targeted device to stop responding, resulting in a DoS condition.

 
Technical Information

The vulnerability is in the operating system's IP stack and any feature that uses services offered by the IP stack to parse IP packets is affected. The vulnerability occurs when the affected software attempts to obtain Layer 4 information of a malformed IP packet, causing the netstack process to terminate unexpectedly and resulting in a DoS condition.

Only transit traffic may trigger the vulnerability; malformed IP packets destined to the device running the affected software do not trigger this vulnerability.  Additionally, the vulnerability can be triggered by UDP or TCP connections.

An unauthenticated, remote attacker could exploit this vulnerability by sending malformed IP packets through the targeted device.  When processed, the malformed IP packets could cause the device to stop responding, resulting in a DoS condition.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.

Administrators are advised to monitor critical systems.

 
Patches/Software

Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.

 
Alert History
 

Version 1, March 15, 2012, 11:41 AM: Cisco NX-OS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition.  Updates are available.



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

Primary Products:
CiscoCisco Virtual Security Gateway for Nexus 1000V Series Switches 4.2(1) VSG1(1), VSG1(2)

Associated Products:
N/A




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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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