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.
A vulnerability in the input parsing of Cisco NX-OS Software could
allow an unauthenticated, local attacker to execute commands on the
underlying operating system.
The vulnerability is due to poor processing of parameters that include special characters. An attacker could
exploit this vulnerability by using using the Linux pipe symbol ( | ) within a command that executes a system() call. A
successful exploit could allow the attacker access to 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.
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.
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.
Cisco has released a security notice at the following link: CVE-2012-4076
Customers should refer to Cisco bug ID CSCtf23559 and CSCtf27780 for the most complete list of affected product versions.
An authenticated, local attacker could exploit this vulnerability to access the bash shell and run arbitrary shell commands with administrative privileges.
Additional technical details are not available.
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.
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 email@example.com
The security vulnerability applies to the following combinations of products.
Cisco 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)
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.