Cisco Security Advisory

Cisco TelePresence Infrastructure Denial of Service Vulnerability

Advisory ID: cisco-sa-20130417-tpi

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130417-tpi

Revision 1.0

For Public Release 2013 April 17 16:00  UTC (GMT)


Summary

Cisco TelePresence multipoint control unit (MCU) and Cisco TelePresence Server contain a vulnerability that could allow an unauthenticated, remote attacker to trigger the reload of an affected system.

Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130417-tpi

Affected Products

Vulnerable Products

The following Cisco TelePresence Infrastructure products are affected by this vulnerability:
  • 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

Products Confirmed Not Vulnerable

The following Cisco TelePresence MCU products are not affected by this vulnerability:
  • Cisco TelePresence MCU 5300 Series and MCU 4200 Series
  • Cisco TelePresence MCU MSE 8420
No other Cisco products are currently known to be affected by this vulnerability.

Details

Cisco TelePresence Infrastructure offers a wide range of products to scale and manage the Cisco TelePresence solution. The Cisco TelePresence Infrastructure solution includes MCU products includes Cisco TelePresence MCU products which are a range of advanced MCUs that are designed to combine continuous presence with high-definition video and voice quality, and Cisco TelePresence Server which connects users to a wide range of endpoints and multivendor telepresence systems.

A vulnerability in the digital signal processor (DSP) card could allow an unauthenticated, remote attacker to cause a crash of the DSP card which will trigger a reload of the affected system.

The vulnerability is due to insufficient validation of a malformed H.264 bit stream that is transported in a Real-Time Transport Protocol (RTP) packet payload. An attacker could exploit this vulnerability by injecting RTP packets with a malformed H.264 bit stream into an established Session Initiation Protocol (SIP) or H.323 session. An exploit could allow the attacker to cause the reload of the affected system.

This vulnerability is described in Cisco bug IDs CSCuc11328 (registered customers only) for Cisco TelePresence Server and CSCub05448 (registered customers only) for Cisco TelePresence MCU Series devices. This vulnerability has been assigned the Common Vulnerabilities and Exposures (CVE) Identifier CVE-2013-1176.

Vulnerability Scoring Details

Cisco has scored the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps organizations determine the urgency and priority of a response.

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link:

http://intellishield.cisco.com/security/alertmanager/cvss



CSCuc11328 and CSCub05448 - Cisco TelePresence Infrastructure Denial of Service Vulnerability

Calculate the environmental score of CSCuc11328 and CSCub05448

CVSS Base Score - 7.1

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

None

None

Complete

CVSS Temporal Score - 5.9

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed


Impact

Successful exploitation of the vulnerability may cause the reload of the affected system.

Software Versions and Fixes

This vulnerability has been resolved in the following system versions:

  • Cisco TelePresence MCU 4500 Series, MCU 4501 Series and Cisco TelePresence MCU MSE 8510  versions 4.3(2.30) and later
  • Cisco TelePresence Server versions 2.3(1.55) and later


When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.


Workarounds

No workarounds are available that mitigate this vulnerability.

Obtaining Fixed Software

Cisco has released free software updates that address the vulnerability described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, upgrades should be obtained through the Software Navigator on Cisco.com at http://www.cisco.com/cisco/software/navigator.html.

Customers Using Third-Party Support Organizations

Customers with Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers, should contact that organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):

  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • e-mail: tac@cisco.com

Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC.

Refer to Cisco Worldwide Contacts at http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and e-mail addresses for support in various languages.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

This vulnerability was found during the resolution of support cases.

Status of This Notice: Final

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.


Distribution

This advisory is posted on Cisco Security Intelligence Operations at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130417-tpi

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:

  • cust-security-announce@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk

Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.


Revision History

Revision 1.0 2013-April-17 Initial public release

Cisco Security Procedures

Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt.


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