Cisco TelePresence Video Communication Server contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted system. Updates are available.
A vulnerability in the Session Initiation Protocol (SIP) module of Cisco
TelePresence Video Communication Server (VCS) could allow an
unauthenticated, remote attacker to trigger the failure of several critical processes, which may cause the termination of active calls. New calls will also not be established until the affected system is restored.
The vulnerability is due to
improper handling of crafted Session Description Protocol (SDP) messages.
An attacker could exploit this vulnerability by sending a crafted SDP message to the affected system. An exploit could allow the attacker to
trigger the failure of several critical processes, which may
cause the affected system to not function properly;
active calls will be terminated and new calls will not be possible
until the affected system is restored. A reload is needed to restore
Cisco has confirmed the vulnerability in a security advisory and has released software updates.
Cisco TelePresence VCS versions prior to X8.1 are affected.
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.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
An unauthenticated, remote attacker could exploit this vulnerability to cause a DoS condition on the the affected system. A reload is needed to restore correct functionality.
The vulnerability is due to improper handling of crafted SDP messages by the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted SDP message to the affected system. When the malicious message is processed by the system, multiple critical processes may fail, which may cause the affected system to not function properly; active calls will be terminated and new calls will not be possible until the affected system is restored. A system reload is needed to restore correct functionality.
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 e-mail at firstname.lastname@example.org
The security vulnerability applies to the following combinations of products.
Cisco TelePresence Video Communication Server (VCS)
X5.2 Base | X6.0 Base | X6.1 Base | X7.0 .0, .1, .2, .3 | X7.1 Base | X7.2 Base, .1, .2
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the
Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service.
This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.
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.