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AUSCERT External Security Bulletin Redistribution
ESB-2015.1551
Cisco TelePresence Video Communication Server SDP Over SIP
Denial of Service Vulnerability
15 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco TelePresence Video Communication Server
Publisher: Cisco Systems
Operating System: Cisco
VMware ESX Server
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2015-0772
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=39240
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Vulnerability Alert
Cisco TelePresence Video Communication Server SDP Over SIP Denial of Service
Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 39240
Version: 1
First Published: 2015 June 09 18:34 GMT
Last Published: 2015 June 09 18:34 GMT
Port: Not available
CVE: CVE-2015-0772
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 5.4
CVSS Version 2.0
CVSS Temporal: 5.4
Version Summary: Cisco TelePresence Video Communication Server contains a
vulnerability that could allow an unauthenticated, remote attacker to cause a
denial of service condition. Updates are not available.
Description
A vulnerability in the Session Description Protocol (SDP) parser of the Cisco
TelePresence Video Communication Server (VCS) could allow an unauthenticated,
remote attacker to cause the Cisco VCS device to become unreachable due to a
denial of service (DoS) attack caused by high CPU utilization.
The vulnerability is due to a parsing error in the SDP parameter negotiation
request. An attacker could exploit this vulnerability by initiating an SDP
session over a Session Initiation Protocol (SIP) connection to the Cisco VCS
device and sending a crafted SDP parameter negotiation request. A successful
exploit could allow the attacker to take the VCS device offline due to high
CPU utilization, resulting in a DoS condition.
Cisco has confirmed the vulnerability; however, software updates are not
available.
Warning Indicators
At the time this alert was first published, Cisco TelePresence VCS version
X8.5RC4 was vulnerable. Later versions of Cisco TelePresence VCS may also be
vulnerable.
IntelliShield Analysis
To exploit this vulnerability, an attacker would need to send a crafted SDP
parameter negotiation request to the targeted device. Depending on where the
targeted system resides in an environment, an attacker may need to bypass
firewall restrictions or other protection measures, which may reduce the
likelihood of a successful exploit.
Vendor Announcements
Cisco has released bug ID CSCut42422 for registered users, which contains
additional details and an up-to-date list of affected product versions.
Impact
An unauthenticated, remote attacker could exploit this vulnerability to
consume excessive amounts of CPU resources, resulting in a DoS condition.
Technical Information
The vulnerability is due to improper parsing of the SDP parameter negotiation
request by an affected device.
An unauthenticated, remote attacker could exploit this vulnerability by
initiating an SDP session over a SIP connection to the targeted device and
sending a crafted SDP parameter negotiation request to the device. An exploit
could allow the attacker to take the device offline due to high CPU
utilization, resulting in a DoS condition.
Safeguards
Administrators are advised to contact the vendor regarding future updates and
releases.
Administrators are advised to allow only trusted users to have network access.
Administrators can help protect affected systems from external attacks by
using a solid firewall strategy.
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.
Patches/Software
Software updates are not available.
Alert History
Initial Release
Product Sets
The security vulnerability applies to the following combinations of products.
Primary Products:
Cisco Cisco TelePresence Video Communication Server (VCS) X8.5 RC4
Associated Products:
N/A
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.
LEGAL DISCLAIMER
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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