Cisco Unified Computing System contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary commands on a targeted system. Updates are available.
A vulnerability in the initial setup script of Cisco Unified
Computing System fabric interconnect (FI) devices could allow an
unauthenticated, remote attacker to execute arbitrary commands on the
underlying operating system.
The vulnerability is due to
unfiltered input in the cluster initial configuration script. An
attacker could exploit this vulnerability by entering invalid parameters
during initial setup. A successful exploit could allow the attacker to
execute arbitrary commands with the privileges of the daemon 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 1.0 through 1.4 were vulnerable. Later releases of Cisco Unified Computing System may also be vulnerable.
To exploit this vulnerability, an attacker may require access to trusted, internal networks to send crafted requests to the affected software. This access requirement could limit the likelihood of a successful exploit.
This issue can be exploited only during the initial setup and configuration of a clustered Unified Computing System fabric interconnect device. An attacker would need to be on the same private subnet that the device uses for configuration during the short configuration period in which the device performs its initial configuration.
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-2012-4087
Customers should refer to Cisco bug ID CSCtg20793 for a complete list of affected product versions.
An unauthenticated, remote attacker with access to the network subnet used by the affected software for initial cluster setup could exploit this vulnerability to execute arbitrary commands on the underlying operating system of the FI devices in a cluster configuration with the privileges of the daemon user. This could also allow the attacker to launch additional attacks.
The vulnerability is due to improper POST data input validation performed by the affected software when processing initial_setup_clusteradd.cgi.
An unauthenticated, remote attacker with access to the network subnet used by the affected software for initial cluster setup could exploit this vulnerability by entering invalid values during initial setup. When the malicious POST data is processed by the affected software, the attacker could execute arbitrary commands on the underlying operating system of the FI devices in a cluster configuration with the privileges of the daemon user. This could also allow the attacker to launch additional attacks.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
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 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.