Zoom up to and including 5.5.4 sometimes allows malicious users 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.
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A security blip in the current version of Zoom could inadvertently leak users’ data to other meeting participants on a call. However, the data is only leaked briefly, making a potential attack difficult to carry out.
The flaw (CVE-2021-28133) stems from a glitch in the screen sharing function of video conferencing platform Zoom. This function allows users to share the contents of their screen with other participants in a Zoom conferencing call. They have the option to share their entire ...