Vulnerability Alert

Cisco TelePresence Video Communication Server SDP Denial of Service Vulnerability

 
Threat Type:CWE: Insufficient Information
IntelliShield ID:32459
Version:1
First Published:2014 January 22 16:08 GMT
Last Published:2014 January 22 16:08 GMT
Port: Not available
CVE:CVE-2014-0662
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.9
 
Version Summary: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.
 
 
Description
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 correct functionality.

Cisco has confirmed the vulnerability in a security advisory and has released software updates.
 
Warning Indicators
Cisco TelePresence VCS versions prior to X8.1 are affected.
 
IntelliShield Analysis
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.
 
Vendor Announcements
Cisco has released a security advisory for bug ID CSCue97632 at the following link: cisco-sa-20140122-vcs
 
Impact
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.
 
Technical Information
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.
 
Safeguards
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.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: Identifying and Mitigating Exploitation of the Cisco TelePresence Video Communication Server SIP Denial of Service Vulnerability
 
Patches/Software
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 tac@cisco.com

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
3571/0Cisco TelePresence Video Communication Service SIP Denial of ServiceS7652014 Jan 22 
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco 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

Associated Products:
N/A




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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.
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