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A vulnerability in the macOS Zoom client could allow a remote, unauthenticated attacker to trigger a denial-of-service condition on a victim's system.
The vulnerability is due to insufficient authorization controls to check which systems may communicate with the local Zoom Web server running on port 19421. An attacker could exploit this vulnerability by creating a malicious website that causes the Zoom client to repeatedly try to join a meeting with an invalid meeting ID. The infinite loop causes the Zoom client to become inoperative and can impact performance of the system on which it runs.
Zoom released version 4.4.2-hotfix of the macOS client on April 28, 2019 to address the issue. Users can help keep themselves secure by applying current updates or downloading the latest Zoom software with all current security updates from https://zoom.us/download.
Discovered by Jonathan Leitschuh.
| Revision | Date | Description |
|---|---|---|
| 1.0 | 07/09/2019 | Initial Publication |