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AUSCERT External Security Bulletin Redistribution
Cisco Webex Network Recording Player and Cisco Webex Player
Arbitrary Code Execution Vulnerability
24 April 2020
AusCERT Security Bulletin Summary
Product: Cisco Webex Network Recording Player for Microsoft Windows
Cisco Webex Player for Microsoft Windows
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
CVE Names: CVE-2020-3194
Revision History: April 24 2020: Fixed releases added for Cisco Webex Meetings Server
April 16 2020: Initial Release
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Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code
Advisory ID: cisco-sa-webex-player-Q7Rtgvby
First Published: 2020 April 15 16:00 GMT
Last Updated: 2020 April 23 16:14 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvs56936 CSCvs56937 CSCvs56938
o A vulnerability in Cisco Webex Network Recording Player for Microsoft
Windows and Cisco Webex Player for Microsoft Windows could allow an
attacker to execute arbitrary code on an affected system.
The vulnerability exists due to insufficient validation of certain elements
with a Webex recording stored in either the Advanced Recording Format (ARF)
or the Webex Recording Format (WRF). An attacker could exploit this
vulnerability by sending a user a malicious ARF or WRF file through a link
or email attachment and persuading the user to open the file with the
affected software on the local system. A successful exploit could allow the
attacker to execute arbitrary code on the affected system with the
privileges of the targeted user.
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:
o Vulnerable Products
This vulnerability affects the following releases of Cisco Webex Network
Recording Player for Microsoft Windows and Cisco Webex Player for Microsoft
Windows, which are available from Cisco Webex Meetings sites and Cisco
Webex Meetings Server:
Cisco Webex Meetings sites - All Webex Network Recording Player and
Webex Player releases earlier than Release WBS 39.5.18 or Release WBS
Cisco Webex Meetings Online sites - All Webex Network Recording Player
and Webex Player releases earlier than Release 1.3.48
Cisco Webex Meetings Server - All Webex Network Recording Player
releases earlier than Release 4.0MR3
To determine which release of Cisco Webex Network Recording Player or Cisco
Webex Player is installed on a system, open the player and choose Help >
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
o Cisco Webex Meetings 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 host, manage, and maintain in their private clouds.
Cisco Webex Meetings services can be configured to allow users to store
meeting recordings online and download those recordings as ARF files. These
services can also be configured to allow users to record meetings directly
on their local computers as WRF files.
Cisco Webex Network Recording Player is the application that is used to
play back ARF files. It is available from Cisco Webex Meetings sites, Cisco
Webex Meetings Online, and Cisco Webex Meetings Server. The player can be
installed manually from a user's Cisco Webex website download page in
Classic view, or from the Cisco Webex Video Recording page.
Cisco Webex Player is the application that is used to play back WRF files.
It is available from Cisco Webex Meetings sites and Cisco Webex Meetings
Online. It is not available from Cisco Webex Meetings Server. The player
can be installed manually from a user's Cisco Webex website download page
in Classic view, or from the Cisco Webex Video Recording page.
o There are no workarounds that address this vulnerability.
o 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/
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
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
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
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table:
Cisco Webex Platform First Fixed Release
Webex Meetings 39.5.x Sites 39.5.18
Webex Meetings Latest Sites 40.2
Webex Meetings Online 1.3.48
Webex Meetings Server 4.0MR3
Customers can download the Cisco Webex Network Recording Player or Cisco
Webex Player from a user's Cisco Webex website download page in Classic
view from the above fixed versions of Cisco Webex Meetings or Cisco Webex
Meetings Server, or from the Cisco Webex Video Recording page.
Exploitation and Public Announcements
o 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.
o Cisco would like to thank Kexu Wang of Fortinet's FortiGuard Labs for
reporting these vulnerabilities.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
| Version | Description | Section | Status | Date |
| | Updated the first fixed | | | |
| 1.1 | release for Cisco Webex | Fixed | Final | 2020-APR-23 |
| | Meetings Server in the | Software | | |
| | Fixed Releases table. | | | |
| 1.0 | Initial public release. | - | Final | 2020-APR-15 |
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