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Vulnerability Alert

Cisco NX-OS Software Input Validation Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:31141
Version:1
First Published:2013 October 09 13:51 GMT
Last Published:2013 October 09 13:51 GMT
Port: Not available
CVE:CVE-2012-4077
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.6
 
 
Version Summary:Cisco NX-OS Software contains a vulnerability that could allow an authenticated, local attacker to execute arbitrary commands on a targeted device. Updates are available.
 
 
Description
A vulnerability in input parsing in Cisco NX-OS Software could allow an authenticated, local attacker to execute commands on the underlying operating system.

The vulnerability is due to improper filtering of parameters passed to the Stream Editor (sed) filter. An attacker could exploit this vulnerability by using sed with the e option. A successful exploit could allow the attacker to access the bash shell and run arbitrary shell commands with administrative privileges.

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 4.0(0)N1(1a) through 4.2(1)N1(1) when running on the Cisco Nexus 5000 Series
  • Cisco NX-OS Software versions 4.1.(2) through 4.2(4) 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 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-2012-4077

Customers should refer to Cisco bug IDs CSCtf25457 and CSCtf27651 for a complete list of affected product versions.
 
Impact
An authenticated, local attacker could exploit this vulnerability to access the bash shell and run arbitrary shell commands with administrative privileges.
 
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 email 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 Base, 4.0(0)N1(1a), 4.0(0)N1(2), 4.0(0)N1(2a), 4.0(1a)N1(1), 4.0(1a)N1(1a), 4.0(1a)N2(1), 4.0(1a)N2(1a), 4.1(3)N1(1), 4.1(3)N1(1a), 4.1(3)N2(1), 4.1(3)N2(1a), 4.2(1)N1(1) | 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)

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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