Zoom Client Screen Sharing Vulnerability (Mar 2021) - Windows

The Zoom Client is prone to a vulnerability in the Application Window Screen Sharing Functionality.

Zoom sometimes allows attackers to read private information on a participant's screen, even though the participant never attempted to share the private part of their screen. When a user shares a specific application window via the Share Screen functionality, other meeting participants can briefly see contents of other application windows that were explicitly not shared. The contents of these other windows can (for instance) be seen for a short period of time when they overlay the shared window and get into focus. (An attacker can, of course, use a separate screen-recorder application, unsupported by Zoom, to save all such contents for later replays and analysis.) Depending on the unintentionally shared data, this short exposure of screen contents may be a more or less severe security issue.

Any version of Zoom Client on Windows.

Checks if a vulnerable version is present on the target host.

No known solution is available as of 29th March, 2021. Information regarding this issue will be updated once solution details are available.