Researchers have found an entirely new attack vector for eavesdropping on Zoom and other virtual meetings. An exotic attack called Glowworm measures an audio output device s LED power light changes and converts them to audio reproductions. Researchers demonstrated how a Glowworm attack might work by pointing a telescope with an electro-optical sensor from 35 meters away at speakers connected to laptop. The team was successfully able to capture a statement played on the speakers and translated by Glowworm. The finding is a good reminder that manufacturers can t always be relied upon to consider these types of TEMPEST attacks.
Source: https://threatpost.com/glowworm-attack-light-flickers-audio/168501/