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.
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.
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.
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-2012-4122
Customers should refer to Cisco bug IDs CSCts56672 and CSCts56669 for the most complete list of affected product versions.
An authenticated, local attacker could exploit this vulnerability to create or overwrite arbitrary files.
Additional technical details are unavailable.
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 firstname.lastname@example.org.
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