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Vulnerability Alert

Cisco TelePresence Infrastructure Digital Signal Processor Denial of Service Vulnerability

 
Threat Type:CWE-399: Resource Management Errors
IntelliShield ID:28929
Version:1
First Published:2013 April 17 16:02 GMT
Last Published:2013 April 17 16:02 GMT
Port: Not available
CVE:CVE-2013-1176
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 Multipoint Control Unit (MCU) and Cisco TelePresence Server contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device. Updates are available.
 
 
Description
Cisco TelePresence Multipoint Control Unit (MCU) and Cisco TelePresence Server contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to insufficient validation of certain Real-Time Transport Protocol (RTP) packet payloads by the digital signal processor (DSP) card component of an affected device. An unauthenticated, remote attacker could exploit this vulnerability by injecting RTP packets with crafted content into an established Session Initiation Protocol (SIP) or H.323 session. A successful exploit could allow the attacker to cause the DSP card to terminate abnormally, leading to a reload of the affected system and denying service to legitimate users.

Cisco has confirmed the vulnerability in a security advisory and has released software updates.
 
Warning Indicators
The following Cisco TelePresence Infrastructure products are affected:
  • Cisco TelePresence MCU 4501 Series, MCU 4500 Series and Cisco TelePresence MCU MSE 8510 versions 4.3(2.18) and earlier
  • Cisco TelePresence Server versions 2.2(1.54) and earlier.
 
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's CSCuc11328 and CSCub05448 at the following link: cisco-sa-20130417-tpi
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause the DSP card to terminate abnormally, leading to a reload of the affected system and denying service to legitimate users.
 
Technical Information
The vulnerability is due to insufficient validation of a crafted H.264 bit stream that is transported in a Real-Time Transport Protocol (RTP) packet payload by the digital signal processor (DSP) card component of an affected device.

An unauthenticated, remote attacker could exploit this vulnerability by injecting RTP packets with a crafted H.264 bit stream into an established Session Initiation Protocol (SIP) or H.323 session. When the malicious H.264 bit stream is processed by the affected software, the DSP card could terminate abnormally. A successful exploit could allow the attacker to cause the DSP card to terminate abnormally, leading to a reload of the affected system and denying service to legitimate users.
 
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.

Understanding activity on the network provides information and visibility that can be used to identify potential security incidents. Organizations should log events from devices and review the logged data to provide insight into anomalies or malicious activity. For logging best practices, consult the Cisco Guide to Harden Cisco IOS Devices.

Network traffic should be monitored security-related network activity. NetFlow identifies security-related network activity. For NetFlow configuration details, consult the Introduction to Introduction to Cisco IOS NetFlow - A Technical Overview.

It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and denial-of-service (DoS) attacks. For configuration details, consult Protecting Your Core: Infrastructure Protection Access Control Lists.
 
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
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco TelePresence Server Software 2.1 (1.33), (1.37) | 2.2 (1.43), (1.48), (1.54)
CiscoCisco TelePresence MCU Software 4.1 (1.51), (1.59) | 4.2 (1.43), (1.46), (1.50) | 4.3 (1.68), (2.18)

Associated Products:
N/A




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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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