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AUSCERT External Security Bulletin Redistribution
Cisco Webex Meetings and Cisco Webex Meetings Server Token
Handling Unauthorized Access Vulnerability
18 June 2020
AusCERT Security Bulletin Summary
Product: Cisco Webex Meetings and Cisco Webex Meetings Server
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2020-3361
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Cisco Webex Meetings and Cisco Webex Meetings Server Token Handling
Unauthorized Access Vulnerability
Advisory ID: cisco-sa-webex-token-zPvEjKN
First Published: 2020 June 17 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvu41048CSCvu43189
o A vulnerability in Cisco Webex Meetings and Cisco Webex Meetings Server
could allow an unauthenticated, remote attacker to gain unauthorized access
to a vulnerable Webex site.
The vulnerability is due to improper handling of authentication tokens by a
vulnerable Webex site. An attacker could exploit this vulnerability by
sending crafted requests to a vulnerable Cisco Webex Meetings or Cisco
Webex Meetings Server site. If successful, the attacker could gain the
privileges of another user within the affected Webex site.
Cisco has released software updates that address this vulnerability.
Customers on Cisco hosted Webex Meetings sites do not need to take any
actions to receive this update. There are no workarounds that address this
This advisory is available at the following link:
o Vulnerable Products
This vulnerability affects the following versions of Cisco Webex Meetings
sites and Cisco Webex Meetings Server:
Cisco Webex Meetings sites releases WBS 39.5.25 and earlier, WBS
40.4.10 and earlier, or release WBS 40.6.0
Cisco Webex Meetings Server releases 4.0MR3 and earlier
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Previous versions of Cisco Webex Meetings Server, versions 2.8.x and 3.0.x,
are not affected.
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
This vulnerability has been fixed in Cisco Webex Meetings. There is no
action customers need to take to get the update for Cisco hosted Webex
This vulnerability has been fixed in Cisco Webex Meetings Server Release
4.0 MR3 Security Patch 1. Customers should apply the updated version of the
software for on-premises 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.
o Cisco would like to thank an anonymous external researcher for reporting
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-JUN-17 |
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