Cisco TelePresence System Software contains a vulnerability that could allow an authenticated, remote attacker to cause a denial of service condition. Updates are available.
A vulnerability in the
t-shell implementation of Cisco TelePresence System Software could allow
an authenticated, remote attacker to exhaust the available
memory and create a denial of service (DoS) condition.
The vulnerability is due to improper handling of orphaned
t-shell sessions. An attacker could exploit this vulnerability
by opening several Secure Shell (SSH) sessions with the affected
system. An exploit could allow the attacker to consume available
memory; therefore, the affected system may become
unreachable and unable to function properly. A hard reboot is
needed to restore complete functionality.
Cisco has confirmed the vulnerability in a Security Notice and software updates are available.
At the time this alert was first published, Cisco TelePresence System Software 1.10(0)(259) and prior were vulnerable. Later versions of Cisco TelePresence System Software may also be affected.
To exploit this vulnerability, the attacker must authenticate to a targeted system. This access requirement limits the possibility of a successful exploit.
Customers are advised to review the bug report in the "Vendor Announcements" section for a current list of affected versions.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
An authenticated, remote attacker could exploit this vulnerability to exhaust the available memory on an affected device, which may cause the device to become unreachable or unable to function properly. This could result in a DoS condition.
The vulnerability is due to improper handling of orphaned t-shell sessions by the affected software.
An authenticated, remote attacker could exploit this vulnerability by opening several SSH sessions with the affected system. If successful, the attacker could cause the targeted device to consume excessive amounts of available memory causing the affected device to become unreachable, which could result in a DoS condition.
Administrators are advised to apply the appropriate updates.
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 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 e-mail 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.