A vulnerability in the input parsing of Cisco NX-OS Software could allow an authenticated, 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 the back quote character in certain command parameters. A successful exploit could allow the attacker to access the bash shell and run arbitrary shell commands with root privileges.
Cisco has confirmed the vulnerability in a security notice and has released software updates.
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.
Customers should refer to Cisco bug IDs CSCtf27788 and CSCtf19827 for a complete list of affected product versions.
Vulnerable ProductsAt the time this alert was first published, Cisco NX-OS Software versions 4.0(0)N1(1a) through 4.2(4) were affected when running on the Cisco Nexus 5000 and 7000 platforms. Other versions of Cisco NX-OS Software may also be affected.
Products Confirmed Not VulnerableNo other Cisco products are currently known to be affected by these vulnerabilities.
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 email at email@example.com
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
Version Description Section Status Date 1.0 Initial Release NA Final 2013-Oct-08
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