The attacks work by modulating voice commands into virtually ultrasonic inaudible signals that a person cannot hear but a voice assistant can respond to. Attackers can embed these signals in media such as an app or YouTube video. When the vulnerable device receives a signal, it obeys hidden built-in commands, allowing attackers to manipulate voice assistants to do something like open a door.

There are two types of NUIT attacks, one affects the device from which the sound is produced (for example via a YouTube video), and the other attacks neighboring devices without touching the “carrier”.

Source: Ferra

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