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:https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-player-Q7Rtgvby
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-player-Q7Rtgvby
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:
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 > About.
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
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.
There are no workarounds that address this vulnerability.
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 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.
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.
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.
Cisco would like to thank Kexu Wang of Fortinet’s FortiGuard Labs for reporting these vulnerabilities.
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 |
|---|---|---|---|---|
| 1.1 | Updated the first fixed release for Cisco Webex Meetings Server in the Fixed Releases table. | Fixed Software | Final | 2020-APR-23 |
| 1.0 | Initial public release. | - | Final | 2020-APR-15 |
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