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From the Schneier on Security blog

This vulnerability was reported to Zoom last December:

The exploit works by targeting the installer for the Zoom application, which needs to run with special user permissions in order to install or remove the main Zoom application from a computer. Though the installer requires a user to enter their password on first adding the application to the system, Wardle found that an auto-update function then continually ran in the background with superuser privileges.

When Zoom issued an update, the updater function would install the new package after checking that it had been cryptographically signed by Zoom. But a bug in how the checking method was implemented meant that giving the updater any file with the same name as Zoom’s signing certificate would be enough to pass the test—so an attacker could substitute any kind of malware program and have it be run by the updater with elevated privilege...