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AUSCERT External Security Bulletin Redistribution
Cisco Webex Network Recording Player and Cisco Webex Player
Arbitrary Code Execution Vulnerabilities
5 March 2020
AusCERT Security Bulletin Summary
Product: Cisco Webex Network Recording Player
Cisco Webex Player for Microsoft Windows
Publisher: Cisco Systems
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2020-3128 CVE-2020-3127
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Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code
Advisory ID: cisco-sa-20200304-webex-player
First Published: 2020 March 4 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Multiple vulnerabilities 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 vulnerabilities are due to insufficient validation of certain elements
within a Webex recording that is stored in either the Advanced Recording
Format (ARF) or the Webex Recording Format (WRF). An attacker could exploit
these vulnerabilities by sending a malicious ARF or WRF file to a user
through a link or email attachment and persuading the user to open the file
on the local system. A successful exploit could allow the attacker to
execute arbitrary code on the affected system with the privileges of the
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:
o Vulnerable Products
These vulnerabilities affect 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, Cisco Webex
Meetings Online sites, and Cisco Webex Meetings Server:
Cisco Webex Meetings - All Webex Network Recording Player and Webex
Player releases earlier than Release WBS 39.5.17 or WBS 39.11.0
Cisco Webex Meetings Online - All Webex Network Recording Player and
Webex Player releases earlier than Release 1.3.49
Cisco Webex Meetings Server - All Webex Network Recording Player
releases earlier than Release 3.0MR3SecurityPatch1 and
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 these vulnerabilities.
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 used to play back ARF files. It is
available from Cisco Webex Meetings sites, Cisco Webex Meetings Online, and
Cisco Webex Meetings Server. It can be installed manually from the Cisco
Webex website, from a user's Webex site, or automatically when a user
accesses an ARF file for streaming playback from a Cisco Webex Meetings
Cisco Webex Player 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. It can also be installed
manually from the Cisco Webex website or from a user's Webex site.
o There are no workarounds that address these vulnerabilities.
o 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
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:
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 39.5.17
Webex Meetings Latest Sites 40.0
Webex Meetings Online ^1 1.3.43 (CVE-2020-3127)
Webex Meetings Server 3.0MR3SecurityPatch1
Webex Meetings Server 4.0MR2SecurityPatch2
1. Although the vulnerability identified as CVE-2020-3127 is addressed in
Cisco Webex Meetings Online Release 1.3.43, this release is still affected
by the vulnerability identified as CVE-2020-3128. Customers who are using
Cisco Webex Meetings Online are advised to upgrade to Release 1.3.49 or
later to address all vulnerabilities described in this advisory.
Note: Cisco Webex Meetings 33.6.x releases reached end of life on Feb. 28,
2020. Customers are advised to upgrade to a fixed and supported release.
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 vulnerabilities that are
described in this advisory.
o Cisco would like to thank Francis Provencher (PRL) working with Trend Micro
Zero Day Initiative for reporting the vulnerability identified as
CVE-2020-3127. Cisco would also like to thank Kexu Wang of Fortinet's
FortiGuard Labs for independently reporting this vulnerability as well as
the vulnerability identified as CVE-2020-3128.
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 |
| 1.0 | Initial public release. | - | Final | 2020-MAR-04 |
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