Vulnerability Alert

Cisco NX-OS Software TACACS+ Command Authorization Vulnerability

 
Threat Type:CWE-264: Permissions, Privileges, and Access Control
IntelliShield ID:32531
Version:1
First Published:2014 January 23 13:10 GMT
Last Published:2014 January 23 13:10 GMT
Port: Not available
CVE:CVE-2014-0676
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.8
 
Version Summary:Cisco NX-OS Software contains a vulnerability that could allow a local attacker to execute certain commands without TACACS+ server authorization. Updates are not available.
 
 
Description
A vulnerability in the TACACS+ command authorization code of Cisco NX-OS Software could allow an authenticated, local attacker to execute certain commands without TACACS+ server authorization.

The vulnerability is due to the processing of certain commands when executed in a sequence. An attacker could exploit this vulnerability by executing multiple commands in a sequence. A successful exploit could allow the attacker to execute certain commands without TACACS+ server authorization.

Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
 
Warning Indicators
At the time this alert was first published, Cisco NX-OS Software Release 6.2(2a) and prior were vulnerable. Later releases of Cisco NX-OS Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must have local access to an affected device. This access requirement reduces the possibility of a successful exploit.

Cisco indicates through the CVSS score that proof-of-concept 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-2014-0676

Customers are advised to consult Cisco bug ID CSCum47367 for the most complete list of affected product versions.
 
Impact
A local attacker could exploit this vulnerability to execute certain commands on an affected device without TACACS+ server authorization. A successful exploit could result in a complete system compromise.
 
Technical Information
The vulnerability is due to the affected software processing and executing certain commands in a sequence.

A local attacker could exploit this vulnerability by executing multiple commands in a sequence on a targeted device. A successful exploit could allow the attacker to execute certain commands without TACACS+ server authorization, which could result in a complete system compromise.
 
Safeguards
Administrators are advised to contact the vendor regarding future updates and releases.

Administrators may consider removing access to all show commands or removing access to config mode with roles on affected devices.

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
Software updates are not available.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco NX-OS Software 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), 6.1(4), 6.1(4a), 6.2(2), 6.2(2a)

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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