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Cisco Bug: CSCvs31323 - Cisco Webex Meetings Multimedia Viewer Security Bypass Vulnerability

Last Modified

Mar 31, 2020

Products (1)

  • Cisco Webex Meetings Online

Known Affected Releases


Description (partial)

A vulnerability within the Multimedia Viewer feature of Cisco Webex Meetings could allow an authenticated, remote attacker to bypass security protections.

The vulnerability is due to missing security warning dialog boxes when a room host views shared multimedia files. An authenticated, remote attacker could exploit this vulnerability by using the host role to share files within the Multimedia sharing feature and convincing a former room host to view that file. A warning dialog normally appears cautioning users before the file is displayed; however, the former host would not see that warning dialog, and any shared multimedia would be rendered within the user''s browser. The attacker could leverage this behavior to conduct additional attacks by including malicious files within a targeted room host''s browser window.

An attacker must have gained the host role within a host''s room prior to an attack. The previous room host would have to leave the existing meeting room or otherwise relinquish the host role. Without the host role, an attacker could not share files through the multimedia sharing feature.

At the time of publication, public cloud-based Cisco Webex Meetings sites versions 40.1 and later contain the fix for this vulnerability.
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