Cisco Unified Computing System contains a vulnerability that could allow an authenticated, local attacker to execute arbitrary commands on a targeted system. Updates are available.
A vulnerability in the clear sshkey command of the Cisco Unified
Computing System fabric interconnect could allow an authenticated, local
attacker to execute commands and obtain an interactive Linux shell
as the root user.
The vulnerability is due to a failure to
properly sanitize user input. An attacker could exploit this
vulnerability by inserting Linux shell commands into a parameter using
common techniques. A successful exploit could allow the attacker to
execute arbitrary commands on the Linux shell as the root user. The attacker
could also gain complete access to the underlying operating system by
obtaining an interactive Linux shell as the root user.
Cisco has confirmed the vulnerability in a security notice and has released software updates.
At the time this alert was first published, Cisco Unified Computing System versions 2.1 and prior were vulnerable. Later releases of Cisco Unified Computing System may also be vulnerable.
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-2012-4109
Customers should refer to Cisco bug ID CSCtq86559 for a complete list of affected product versions.
An attacker could exploit this vulnerability to execute any command on the Linux shell as the root user. The attacker could also gain complete access to the underlying operating system by obtaining an interactive Linux shell as the root user.
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 email at firstname.lastname@example.org
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.