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AUSCERT External Security Bulletin Redistribution
ESB-2019.1749
Cisco Webex Network Recording Player Arbitrary Code
Execution Vulnerabilities
16 May 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Webex Player for Microsoft Windows
Cisco Webex Network Recording Player for Microsoft Windows
Publisher: Cisco Systems
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1773 CVE-2019-1772 CVE-2019-1771
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-webex-player
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Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities
Priority: High
Advisory ID: cisco-sa-20190515-webex-player
First Published: 2019 May 15 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
CVE-2019-1771
CVE-2019-1772
CVE-2019-1773
CWE-119
CVSS Score:
7.8 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o Multiple vulnerabilities in the Cisco Webex Network Recording Player for
Microsoft Windows and the Cisco Webex Player for Microsoft Windows could
allow an attacker to execute arbitrary code on an affected system.
The vulnerabilities exist because the affected software improperly
validates Advanced Recording Format (ARF) and Webex Recording Format (WRF)
files. An attacker could exploit these vulnerabilities by sending a user a
malicious ARF or WRF file via 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.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability. No exploit code proving
exploitability of the vulnerabilities is publicly available.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190515-webex-player
Affected Products
o Vulnerable Products
These vulnerabilities affect the following versions of the Cisco Webex
Network Recording Player for Microsoft Windows and the Cisco Webex Player
for Microsoft Windows, which are available from Cisco Webex Business Suite
sites, Cisco Webex Meetings Online sites, and Cisco Webex Meetings Server:
Cisco Webex Business Suite sites - All Webex Network Recording Player
and Webex Player versions prior to Version WBS39.2.205
Cisco Webex Meetings Online - All Webex Network Recording Player and
Webex Player versions prior to Version 1.3.42
Cisco Webex Meetings Server - All Webex Network Recording Player
versions prior to Version 2.8MR3 SecurityPatch2, 3.0MR2 SecurityPatch2,
or 4.0
To determine which version of the Cisco Webex Network Recording Player or
the Cisco Webex Player is installed on a system, users can open the player
and choose Help > About .
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco Webex Network Recording Player for Mac OS is not affected.
Details
o Cisco Webex Business 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 host, manage, and maintain in their private clouds.
Cisco Webex Business Suite 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.
The Cisco Webex Network Recording Player is the application that is used to
play back ARF files. It is available from Cisco Webex Business Suite sites,
Cisco Webex Meetings Online, and Cisco Webex Meetings Server. The player
can be installed manually from the Cisco Webex website , from the user's
Webex site, or automatically when a user accesses an ARF file for streaming
playback from a Cisco Webex Business Suite site.
The Cisco Webex Player is the application that is used to play back WRF
files. It is available from Cisco Webex Business Suite sites and Cisco
Webex Meetings Online. It is not available from Cisco Webex Meetings
Server. The player can also be installed manually from the Cisco Webex
website or from the user's Webex site.
Workarounds
o There are no workarounds that address these vulnerabilities. However,
customers may remove the Cisco Webex Network Recording Player and the Cisco
Webex Player from a system by using the software-removal procedure for the
operating system. For example, to remove a player from a Microsoft Windows
10 system, customers can use the Apps & Features app in Windows Settings .
To remove all Cisco Webex software from a Microsoft Windows system,
customers can use the Meeting Services Removal Tool, which is available for
download from the Cisco Collaboration Help article Cisco Webex and 3rd
Party Support Utilities .
By removing the Cisco Webex Network Recording Player, a user will be unable
to play recordings. However, the next time media is accessed, the system
will download a new version of the software, providing the user with an
updated version.
Fixed Software
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/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
Cisco has fixed these vulnerabilities in the following versions of the
Cisco Webex Network Recording Player and the Cisco Webex Player:
Cisco Webex Business Suite sites - Webex Network Recording Player and
Webex Player Versions WBS39.2.205 and later
Cisco Webex Business Suite lockdown sites - Webex Network Recording
Player and Webex Player Versions WBS33.6.11 and later
Cisco Webex Meetings Online - Webex Network Recording Player and Webex
Player Versions 1.3.42 and later
Cisco Webex Meetings Server - Webex Network Recording Player Versions
2.8MR3 SecurityPatch2, 3.0MR2 SecurityPatch3, or 4.0 and later
Cisco has not and will not fix all these vulnerabilities in Cisco Webex
Business Suite WBS32 sites because those sites have reached the
end-of-version-support milestone. For information about this milestone and
the upgrade plans for WBS32 sites, see Cisco Webex Meetings Suite Version
Retirement Policy .
Customers can upgrade to a fixed version of the Cisco Webex Network
Recording Player in either of two ways:
Automatically : The player will be automatically upgraded to the latest
version of the software when a user accesses an ARF file that is hosted
on a Cisco Webex Business Suite site, Cisco Webex Meetings Online site,
or Cisco Webex Meetings Server.
Manually : The player can be downloaded and installed from https://
www.webex.com/play-webex-recording.html .
Note : Customers who use locked-down Cisco Webex sites will not receive
updated versions of the Cisco Webex Network Recording Player automatically.
These customers should contact Cisco Webex Customer Support to obtain
updates or the latest version of the player from https://www.webex.com/
play-webex-recording.html .
Customers can upgrade to a fixed version of the Cisco Webex Player by
uninstalling their current version of the player and then downloading and
installing the latest version of the player from https://www.webex.com/
play-webex-recording.html .
The following table lists the Cisco bug IDs and fixed versions of the
software for each vulnerability that is described in this advisory.
Customers are advised to upgrade to an appropriate version as indicated in
the table.
Fixed Versions
Fixed Versions
Cisco Webex Business Webex Business Webex
assigned CVE Suite WBS Latest Suite WBS33.6.x Webex Meetings Meetings
ID Sites Sites Server Online
2.8MR3
CVE-2019-1771 39.2.205 33.6.11 SecurityPatch2, 1.3.42
3.0MR2
SecurityPatch3
2.8MR3
CVE-2019-1772 39.1.0.471 33.6.11 SecurityPatch2, 1.3.42
3.0MR2
SecurityPatch3
CVE-2019-1773 39.2.205 33.6.11 4.0 1.3.42
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. No exploit code exists at the time of
publication proving the potential for code execution. Cisco PSIRT evaluates
the Security Impact Rating as High despite the lack of evidence proving
code execution.
Source
o Cisco would like to thank Yici Wang of Fortinet's FortiGuard Labs for
reporting this vulnerability.
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190515-webex-player
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2019-May-15 |
+----------+---------------------------+----------+--------+--------------+
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