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Vulnerability Alert

Cisco Nexus 1000V Series Switches Arbitrary Command Execution Vulnerability

 
Threat Type:CWE-78: OS Command Injections
IntelliShield ID:31774
Version:1
First Published:2013 November 15 17:46 GMT
Last Published:2013 November 15 17:46 GMT
Port: Not available
CVE:CVE-2013-5556
BugTraq ID:63732
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.6
Related Resources:
View related Security Notice
 
 
Version Summary:Cisco Nexus 1000V Series Switches contain a vulnerability that could allow a local attacker to execute arbitrary shell commands. Updates are available.
 
 
Description
A vulnerability in the license installation module of the Cisco Nexus 1000V could allow an authenticated, local attacker to execute arbitrary shell commands.

The vulnerability is due to a failure of the install all iso command to properly validate user-supplied input. An attacker could exploit this vulnerability by providing crafted arguments to the install all iso command.

Cisco has confirmed the vulnerability in a security notice and released software updates.
 
Warning Indicators
At the time this alert was first published, the following releases of Cisco products running on Cisco NX-OS Software were vulnerable. Later releases of Cisco products may also be affected.
  • Cisco Nexus 1000V Switch for VMware vSphere versions 4.2(1)SV1(5.2b) and prior
  • Cisco Nexus 1000V Switch for Microsoft Hyper-V version 5.2(1)SM1(5.1)
  • Cisco Virtual Security Gateway for Nexus 1000V Series Switches 4.2(1)(VSG1(1)
 
IntelliShield Analysis
To exploit this vulnerability, an attacker would need local access to the targeted device, which 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-2013-5556

Customers are advised to consult Cisco bug ID CSCui21340 for a complete list of affected product versions.
 
Impact
A local attacker could exploit this vulnerability to execute arbitrary shell commands, which could lead to a complete system compromise of an affected device.
 
Technical Information
The vulnerability is due to insufficient validation of user-supplied input by the install all iso command used on Cisco Nexus 1000V Series Switches.

A local attacker could exploit this vulnerability by providing crafted arguments to the install all iso command on an affected device. A successful exploit could allow the attacker to execute arbitrary shell commands, which could result in a complete system compromise.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to access local systems.

Administrators are advised to allow only privileged users to access administration or management 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 NX-OS Software Cisco Nexus 1000V Switch for VMware vSphere Base, 4.0(4)SV1(1), 4.0(4)SV1(2), 4.0(4)SV1(3), 4.0(4)SV1(3a), 4.0(4)SV1(3b), 4.0(4)SV1(3c), 4.0(4)SV1(3d), 4.2(1)SV1(4), 4.2(1)SV1(4a), 4.2(1)SV1(4b), 4.2(1)SV1(5.1), 4.2(1)SV1(5.1a), 4.2(1)SV1(5.2), 4.2(1)SV1(5.2b) | Cisco Nexus 1000V Switch for Microsoft Hyper-V 5.2(1)SM1(5.1)
CiscoCisco Virtual Security Gateway for Nexus 1000V Series Switches 4.2(1) VSG1(1)

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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