A vulnerability in Cisco Webex Meetings Suite sites and Cisco Webex Meetings Online sites could allow an unauthenticated, remote attendee to join a password-protected meeting without providing the meeting password. The connection attempt must initiate from a Webex mobile application for either iOS or Android. The vulnerability is due to unintended meeting information exposure in a specific meeting join flow for mobile applications. An unauthorized attendee could exploit this vulnerability by accessing a known meeting ID or meeting URL from the mobile device’s web browser. The browser will then request to launch the device’s Webex mobile application. A successful exploit could allow the unauthorized attendee to join the password-protected meeting. The unauthorized attendee will be visible in the attendee list of the meeting as a mobile attendee. Cisco has applied updates that address this vulnerability and no user action is required. 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-20200124-webex-unauthjoin
A vulnerability in Cisco Webex Meetings Suite sites and Cisco Webex Meetings Online sites could allow an unauthenticated, remote attendee to join a password-protected meeting without providing the meeting password. The connection attempt must initiate from a Webex mobile application for either iOS or Android.
The vulnerability is due to unintended meeting information exposure in a specific meeting join flow for mobile applications. An unauthorized attendee could exploit this vulnerability by accessing a known meeting ID or meeting URL from the mobile device’s web browser. The browser will then request to launch the device’s Webex mobile application. A successful exploit could allow the unauthorized attendee to join the password-protected meeting. The unauthorized attendee will be visible in the attendee list of the meeting as a mobile attendee.
Cisco has applied updates that address this vulnerability and no user action is required. 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-20200124-webex-unauthjoin
This vulnerability affects Cisco Webex Meetings Suite sites and Cisco Webex Meetings Online sites releases earlier than 39.11.5 and 40.1.3.
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that Cisco Webex Meetings Server is not affected.
To determine the current release on a Cisco Webex Meetings Suite site or Cisco Webex Meetings Online site, a user can perform the following steps:
There are no workarounds that address this vulnerability.
Cisco has addressed this vulnerability in Cisco Webex Meetings Suite sites and Cisco Webex Meetings sites, which are cloud based. No user action is required. The Details section of this advisory describes how to determine the current running release.
Customers who need additional information are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance provider.
Cisco fixed this vulnerability in page versions 39.11.5 and later and 40.1.3 and later for Cisco Webex Meetings Suite sites and Cisco Webex Meetings Online sites. These page versions apply to client versions T32, T33, T39, and T40. The fix applies to Cisco Webex Meetings Suite sites and Cisco Webex Meetings sites only. Customers are not required to update the Cisco Webex Meetings mobile application or the Cisco Webex Meetings desktop application.
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements of the vulnerability that is described in this advisory.
Cisco PSIRT is aware of active use of the vulnerability that is described in this advisory.
This vulnerability was found during the resolution of a Cisco TAC support case.
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 | Corrected link destination for visible advisory URL in the Summary section. | Summary | Final | 2020-January-24 |
| 1.0 | Initial public release. | - | Final | 2020-January-24 |
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