Cisco Webex Network Recording Player Remote Code Execution Vulnerabilities

CVE Numbers – CVE-2018-15414 and CVE-2018-15421 and CVE-2018-15422

Multiple vulnerabilities in the Cisco Webex Network Recording Player for Advanced Recording Format (ARF) could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.

The vulnerabilities are due to improper validation of Webex recording files. An attacker could exploit these vulnerabilities by sending a user a link or email attachment containing a malicious file and persuading the user to open the file in the Cisco Webex Player. A successful exploit could allow the attacker to execute arbitrary code on an affected system.

Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180919-webex

• Vulnerable Products

  These vulnerabilities affect ARF recording players available from Cisco Webex Meetings Suite sites, Cisco Webex Meetings Online sites, and Cisco Webex Meetings Server. The following versions of ARF recording players are affected:

  • Cisco Webex Meetings Suite (WBS32) – Webex Network Recording Player versions prior to WBS32.15.10
  • Cisco Webex Meetings Suite (WBS33) – Webex Network Recording Player versions prior to WBS33.3
  • Cisco Webex Meetings Online – Webex Network Recording Player versions prior to 1.3.37
  • Cisco Webex Meetings Server – Webex Network Recording Player versions prior to 3.0MR2

  To determine which version of the Cisco Webex Network Recording Player (for .arf files) is installed, users can open the player and select the Help > About menu.

  Note: Customers who do not receive automatic software updates may be running versions of Cisco Webex Meetings that have reached end of software maintenance and should contact customer support.

  For information about which Cisco Webex Network Recording Player releases are vulnerable, see the Fixed Software section of this advisory.

  Products Confirmed Not Vulnerable

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

• The Cisco Webex Meetings Suite services and Cisco WebEx Meetings Online are hosted multimedia conferencing solutions that are managed and maintained by Cisco Webex. Cisco Webex Meetings Server is a multimedia conferencing solution that customers can host in their private clouds.

  Cisco Webex Meetings services can be configured to allow recording of a meeting that is stored online and can be downloaded by a user in ARF format. These services can also record meetings directly on local computers in WRF format. The Cisco Webex Network Recording Player plays .arf files and the Cisco Webex Player plays .wrf files.

  The Network Recording Player can be automatically installed when a user accesses a recording file that is hosted on a Cisco Webex Meetings Suite site (for streaming playback mode). The Cisco Webex Network Recording Player can also be installed manually. The Cisco Webex Player can only be manually installed from the Webex site.

  The Cisco Webex Network Recording Player for .arf files is available for Cisco Webex Meetings Suite (WBS31, WBS32, WBS33), Cisco Webex Meetings Online, and for Cisco Webex Meetings Server. The Cisco Webex Player for .wrf files is only available for Cisco Webex Meetings Suite (WBS31, WBS32, and WBS33) and Cisco Webex Meetings Online. The Cisco Webex Player for .wrf files is not available for Cisco Webex Meetings Server.

  The vulnerabilities disclosed in this advisory affect the Cisco Webex Network Recording Player. Windows, OS X, and Linux versions of the players are all affected by at least one vulnerability described in this advisory.

• There are no workarounds that address these vulnerabilities. However, it is possible to remove the affected Cisco Webex Network Recording Player and Cisco Webex Player by following the uninstall procedure for the operating system. For example, in Windows, use Add or Remove Programs to uninstall the affected players.
  
  
  
  
  To remove Webex software completely from a system, use the Meeting Services Removal Tool (for Microsoft Windows users) or Mac Webex Meeting Application Uninstaller (for Apple Mac OS X users), available for download from the Cisco Collaboration Help article Cisco WebEx and 3rd Party Support Utilities.

  Removal of the Webex software from a Linux or UNIX-based system can be accomplished by following the steps in the Cisco Collaboration Help article How Do I Uninstall WebEx Software on a Linux or Unix Based System?

• Cisco has released free software updates that address the vulnerabilities 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 versions of the Cisco Webex Network Recording Player available from the Cisco Webex Meetings Suite sites (WBS32, WBS33), Cisco Webex Meetings Online site, and Cisco Webex Meetings Server address all the vulnerabilities described in this advisory:

  • Cisco Webex Meetings Suite (WBS32) – Cisco Webex Network Recording Player versions WBS32.15.10 and later
  • Cisco Webex Meetings Suite (WBS33) – Cisco Webex Network Recording Player versions WBS33.3 and later
  • Cisco Webex Meetings Online – Webex Network Recording Player versions 1.3.37 and later
  • Cisco Webex Meetings Server – Webex Network Recording Player versions 3.0MR2 and later

  Alternatively, the latest versions of the ARF player are available from http://www.webex.com/play-webex-recording.html.

  The Cisco Webex Network Recording Player (for .arf files) will be automatically upgraded to the latest, non-vulnerable version when users access a recording file that is hosted on a Cisco Webex Meetings site that contains the versions previously specified. Users will need to manually uninstall the Cisco Webex Player and get the updated version of the Cisco Webex Player from http://www.webex.com/play-webex-recording.html or from a Cisco Webex Meetings site specified previously.

  Note: Customers on lockdown sites will not automatically get updated versions of the Cisco Webex Network Recording Player. Contact Webex Support to update a Cisco Webex site and get the updated version of the Cisco Webex Recording Players from http://www.webex.com/play-webex-recording.html.

Duncan

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.