Summary

• A vulnerability in the Real-Time Transport Protocol (RTP) bitstream processing of the Cisco Meeting Server could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
  
  The vulnerability is due to insufficient input validation of incoming RTP bitstreams. An attacker could exploit this vulnerability by sending a crafted RTP bitstream to an affected Cisco Meeting Server. A successful exploit could allow the attacker to deny audio and video services by causing media process crashes resulting in a DoS condition on the affected product.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180516-msms

Affected Products

• Vulnerable Products

  This vulnerability affects Cisco Meeting Server deployments that are running Cisco Meeting Server Software Releases 2.0, 2.1, 2.2, and 2.3.

  Administrators can determine which Cisco Meeting Server Software release is running on a device by using the version command in the CLI. The following example shows the output of the command for a device that is running Cisco Meeting Server Software Release 2.2.11:

      system> version
      2_2_11 

  Products Confirmed Not Vulnerable

  Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

Details

• Cisco Meeting Server incorporates video, audio, and content-sharing capabilities into software that can be accessed via a conference room, desktop, or mobile device. Cisco Meeting Server works across Cisco video rooms and connects with Skype for Business and other hardware providers to allow a seamless meeting architecture. This capability exists via collaboration between Cisco and Acano, which was acquired by Cisco in 2016.
  

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:
  https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

  Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.

  When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, 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.

  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 TAC:
  https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

  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.

  Fixed Releases

  The following Cisco Meeting Server Software releases address this vulnerability:

  Cisco Meeting Server	First Fixed Release for This Vulnerability
  2.0	Affected; migrate to 2.2.10
  2.1	2.1.12 (see note)
  2.2	2.2.10
  2.3	2.3.1

  Note: Cisco Meeting Server Software Release 2.1 has reached the end of support and can be used only for upgrade chain purposes. For more information, refer to the “End Of Software Maintenance” section in Cisco Meeting Server Release 2.3.0 Release Notes.

  For information about the Cisco Meeting Server Software release model, refer to Cisco Meeting Server: End of maintenance and support policy.

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.

Source

• This vulnerability was found during resolution of a Cisco TAC support case.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180516-msms

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2018-May-16

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