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AUSCERT External Security Bulletin Redistribution
ESB-2021.1908
Cisco Webex Player Memory Corruption Vulnerability
3 June 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Webex Player
Publisher: Cisco Systems
Operating System: Windows
Mac OS
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1527 CVE-2021-1526
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-player-kOf8zVT
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-player-kxtkFbnR
Comment: This bulletin contains two (2) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Webex Player Memory Corruption Vulnerability
Priority: High
Advisory ID: cisco-sa-webex-player-kOf8zVT
First Published: 2021 June 2 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx58407
CVE Names: CVE-2021-1526
CWEs: CWE-119
Summary
o A vulnerability in Cisco Webex Player for Windows and MacOS could allow an
attacker to execute arbitrary code on an affected system.
This vulnerability is due to insufficient validation of values in Webex
recording files that are in Webex Recording Format (WRF). An attacker could
exploit this vulnerability by sending a user a malicious 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-kOf8zVT
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Webex Player for Windows and MacOS
releases earlier than Release 41.5. The player is available from Cisco
Webex Meetings sites.
To determine which release of Cisco Webex Player is installed on a system,
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.
The Cisco Webex Network Recording Player for Windows and MacOS is not
affected by this vulnerability.
Details
o Cisco Webex Meetings is a hosted, multimedia conferencing solution that is
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 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 used to play back WRF files. It is available from
Cisco Webex Meetings sites. 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.
Workarounds
o There are no workarounds that address this vulnerability.
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 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 fixed this vulnerability in Cisco Webex Player releases 41.5 and
later. Releases are available from the Cisco Webex Video Recording page or
from corresponding Cisco Webex Meetings sites.
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.
Source
o Cisco would like to thank Kushal Arvind Shah of Fortinet 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-webex-player-kOf8zVT
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-JUN-02 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------
Cisco Webex Player Memory Corruption Vulnerability
Priority: Medium
Advisory ID: cisco-sa-webex-player-kxtkFbnR
First Published: 2021 June 2 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx58427
CVE Names: CVE-2021-1527
CWEs: CWE-119
Summary
o A vulnerability in Cisco Webex Player for Windows and MacOS could allow an
attacker to cause the affected software to terminate or to gain access to
memory state information that is related to the vulnerable application.
The vulnerability is due to insufficient validation of values in Webex
recording files that are stored in Webex Recording Format (WRF). An
attacker could exploit this vulnerability by sending a malicious WRF file
to a user as a link or email attachment and then persuading the user to
open the file with the affected software on the local system. A successful
exploit could allow the attacker to crash the affected software and view
memory state information.
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-kxtkFbnR
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco Webex Player
for Windows and MacOS releases earlier than Release 41.5, which are
available from Cisco Webex Meetings.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
To determine which release of Cisco Webex Player is installed on a system,
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 has confirmed that this vulnerability does not affect Cisco Webex
Network Recording Player for Windows and MacOS.
Details
o Cisco Webex Meetings is a hosted, multimedia conferencing solution that is
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 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. 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.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories 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.
Fixed Releases
At the time of publication, Cisco Webex Player releases 41.5 and later
contained the fix for this vulnerability. Releases are available from the
Cisco Webex Video Recording page or from corresponding Cisco Webex Meetings
sites.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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.
Source
o Cisco would like to thank Kushal Arvind Shah of Fortinet 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-webex-player-kxtkFbnR
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-JUN-02 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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