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David Wells

Senior Research Engineer, Zero Day Research

David Wells's picture
David started in the cybersecurity industry with a strong focus on Windows reverse engineering. This led into four years of malware reverse engineering and research, tracking several well known malware campaigns as well as custom targeted campaigns aimed at high profile corporations. David brings thorough reverse engineering experience in bug finding to help understand vulnerable systems as a whole in order to break them holistically.

[R2] Zoom Message Spoofing

Tenable discovered a flaw in Zoom's thick client that allows attackers to hijack control of presenters’ desktops, spoof chat messages, and kick attendees out of Zoom calls. The flaw is due to the lack of message validation. An attacker can spoof Zoom server messages to invoke restricted functionalities reserved for Zoom servers.

In order to successfully exploit this vulnerability the attacker needs know the IP address of an attendee or a Zoom server IP address. Also, the attacker needs to know the attendees meeting attendee IDs, but they can be trivially brute forced.

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