Cisco Webex Network Recording Players Remote Code Execution Vulnerabilities

Summary

• Multiple vulnerabilities exist in the Cisco Webex Network Recording Player for Advanced Recording Format (ARF) and Webex Recording Format (WRF) files. An attacker could exploit these vulnerabilities by providing a user with a malicious .arf or .wrf file via email or URL and convincing the user to launch the file in the Webex recording players. Exploitation of these vulnerabilities could allow arbitrary code execution on the system of a targeted user. There is no risk when a .arf player that is stored on a Webex site is played in the Webex Network Recording Player.

  The Cisco Webex players are applications that are used to play back Webex meetings that have been recorded by an online meeting attendee. The Webex Network Recording Player for .arf files can be automatically installed when the user accesses a recording that is hosted on a Webex server. The Webex Player for .wrf files can be downloaded manually.

  Cisco has updated affected versions of the ARF and WRF recording players on Cisco Webex Meetings Suite sites, Cisco Webex Meetings Online sites, and Cisco Webex Meetings Server. 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-20180718-webex-rce

Affected Products

• Vulnerable Products

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

  • Cisco Webex Meetings Suite (WBS31) - Webex Network Recording Player and Webex Player versions prior to WBS31.23
  • Cisco Webex Meetings Suite (WBS32) - Webex Network Recording Player and Webex Player versions prior to WBS32.15
  • Cisco Webex Meetings Suite (WBS33) - Webex Network Recording Player and Webex Player versions prior to WBS33.2
  • Cisco Webex Meetings Online - Webex Network Recording Player and WebEx Player versions prior to 1.3.35
  • Cisco Webex Meetings Server - Webex Network Recording Player versions prior to 3.0MR1

  To determine which version of the Cisco Webex Network Recording Player (for .arf files) or the Cisco Webex Player (for .wrf 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.

  Products Confirmed Not Vulnerable

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

Details

• 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 and the Cisco Webex Player. Windows, OS X, and Linux versions of the players are all affected by at least one vulnerability described in this advisory.

Workarounds

• 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?.

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 versions of the Cisco Webex Network Recording Player and the Cisco Webex Player available from the Cisco Webex Meetings Suite sites (WBS31, WBS32, WBS33), Cisco Webex Meetings Online site, and Cisco Webex Meetings Server address all the vulnerabilities described in this advisory:
  

  • Cisco Webex Meetings Suite (WBS31) - Cisco Webex Network Recording Player and Cisco Webex Player versions WBS31.23 and later
  • Cisco Webex Meetings Suite (WBS32) - Cisco Webex Network Recording Player and Cisco Webex Player versions WBS32.15 and later
  • Cisco Webex Meetings Suite (WBS33) - Cisco Webex Network Recording Player and Cisco Webex Player versions WBS33.2 and later
  • Cisco Webex Meetings Online - Webex Network Recording Player and WebEx Player versions 1.3.35 and later
  • Cisco Webex Meetings Server - Webex Network Recording Player versions 3.0MR1 and later

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

  To determine whether a Cisco Webex meeting site has an updated version of the Cisco Webex Players, users can sign into their Cisco Webex Meetings site and go to the Support > Downloads section. The version is displayed on the right side of the page under About Webex Meetings.

  The Cisco Webex Network Recording Player (for .arf files) will be automatically upgraded to the latest, nonvulnerable 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 and Cisco Webex 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.

  Cisco Bug ID	First Fixed Release
  	WBS31	WBS32	WBS33	Webex Meetings Online	Webex Meetings Server
  CSCvi02621	31.23	32.15	33.2
  CSCvi02965				1.3.35
  CSCvi63329	31.23	32.15	33.2
  CSCvi63333					3.0MR1
  CSCvi63335				1.3.35
  CSCvi63374	31.23	32.15	33.2
  CSCvi63376					3.0MR1
  CSCvi63377				1.3.35
  CSCvi63391	31.23	32.15	33.0.6 33.1.1 33.2
  CSCvi63392					3.0MR1
  CSCvi63396				1.3.35
  CSCvi63495	31.23	32.15	33.2
  CSCvi63497					3.0MR1
  CSCvi63498				1.3.35
  CSCvi82684	31.23		33.2
  CSCvi82700					3.0MR1
  CSCvi82705				1.3.35
  CSCvi82725	31.23	32.15	33.2
  CSCvi82737					3.0MR1
  CSCvi82742				1.3.35
  CSCvi82760	31.23	32.15	33.2
  CSCvi82771				1.3.35
  CSCvj51284		32.15	33.2
  CSCvj51294				1.3.35

  
  

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

• These vulnerabilities were reported to Cisco by Fortinet and Trend Micro as follows:

  Cisco Bug IDs	Reporter
  CSCvi02621, CSCvi02965	Kushal Arvind Shah of Fortinet's FortiGuard Labs
  CSCvi63329, CSCvi63333, CSCvi63335, CSCvi63374, CSCvi63376, CSCvi63377, CSCvi63391, CSCvi63392, CSCvi63396, CSCvi82684, CSCvi82700, CSCvi82705, CSCvi82725, CSCvi82737, CSCvi82742, CSCvj51284, CSCvj51294	b0nd working with Trend Micro's Zero Day Initiative
  CSCvi63495, CSCvi63497, CSCvi63498, CSCvi82760, CSCvi82771	Steven Seeley of Source Incite working with Trend Micro's Zero Day Initiative

  
  

URL

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180718-webex-rce

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2018-July-18

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