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Vulnerability Alert

Cisco NX-OS Software Input Validation Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:31139
Version:1
First Published:2013 October 08 17:47 GMT
Last Published:2013 October 08 17:47 GMT
Port: Not available
CVE:CVE-2012-4122
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.6 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.8
 
 
Version Summary:Cisco NX-OS Software contains a vulnerability that could allow an authenticated, local attacker to create or overwrite arbitrary files on a targeted device. Updates are available.
 
 
Description
A vulnerability in the command-line interface (CLI) parser of Cisco NX-OS Software could allow an authenticated, local attacker to create or overwrite files.

The vulnerability is due to improper input filtering. An attacker could exploit this vulnerability by using a shell output redirection. A successful exploit could allow the attacker to create or overwrite arbitrary files. This vulnerability is available to all users, including read-only users.

Cisco has confirmed the vulnerability in a security notice and has released software updates.
 
Warning Indicators
The following Cisco products are affected:
  • Cisco NX-OS Software versions 5.0(3)N2(1) through 5.1(3)N1(1a) when running on the Cisco Nexus 5000 Series.
  • Cisco NX-OS Software versions 4.1.(2) through 6.1(3) when running on the Cisco Nexus 7000 Series.
Other versions of Cisco NX-OS Software may also be affected.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker requires authenticated access to the targeted system. Authenticated access may require the attacker to access trusted, internal networks. These access requirements could limit 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-2012-4122

Customers should refer to Cisco bug IDs CSCts56672 and CSCts56669 for the most complete list of affected product versions.
 
Impact
An authenticated, local attacker could exploit this vulnerability to create or overwrite arbitrary files.
 
Technical Information
Additional technical details are unavailable.
 
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 trusted users to have network access.

Administrators are advised to allow only privileged users to access administration or management systems.

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 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
 
Initial Release


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

Primary Products:
CiscoCisco NX-OS Software for Nexus 5000 Series 5.0(3)N2(1), 5.0(3)N2(2), 5.0(3)N2(2a), 5.0(3)N2(2b), 5.1(3)N1(1), 5.1(3)N1(1a) | for Nexus 7000 Series Base, 4.1.(2), 4.1.(3), 4.1.(4), 4.1.(5), 4.2.(2a), 4.2(3), 4.2(4), 4.2(6), 4.2(8), 5.0(2a), 5.0(3), 5.0(5), 5.1(1), 5.1(1a), 5.1(3), 5.1(4), 5.1(5), 5.1(6), 5.2(1), 5.2(3a), 5.2(4), 5.2(5), 5.2(7), 5.2(9), 6.0(1), 6.0(2), 6.0(3), 6.0(4), 6.1(1), 6.1(2), 6.1(3)

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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