Cisco Unified Computing System contains a vulnerability that could allow an authenticated, local attacker to cause a denial of service condition on a targeted system. Updates are available.
A vulnerability in the memory management when executing either the show monitor session all or show monitor session command-line interface (CLI) commands on the Cisco Unified Computing System (UCS) 6100 Series Fabric Interconnects could allow an authenticated, local attacker to trigger a memory leak.
The vulnerability is due to not releasing memory after execution of the CLI commands, if a Switched Port Analyzer (SPAN) session is not actually configured. An attacker could exploit this vulnerability by executing either the show monitor session all or the show monitor session locally on the device. An exploit could allow the attacker to cause the device to exhaust its memory and reset.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco UCS versions 2.1(1f) and prior were vulnerable. Later releases of Cisco UCS may also be vulnerable.
To exploit this vulnerability, an attacker would need to authenticate and have local access to the targeted device. These access requirements 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-2013-3467
Customers are advised to consult Cisco bug ID CSCug20103 for the most complete list of affected product versions.
An authenticated, local attacker could exploit this vulnerability to cause an affected device to exhaust its memory resources and reload, resulting in a denial of service (DoS) condition.
The vulnerability is due to improper handling of memory by the affected software after executing CLI commands when the SPAN session is not configured.
An authenticated, local attacker could exploit this vulnerability by executing either the show monitor session all or the show monitor session on the targeted device. An exploit could allow the attacker to cause the device to exhaust its memory and reset, resulting in a DoS condition.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local 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 should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at firstname.lastname@example.org for assistance.
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.