Light Commands is a vulnerability of MEMS microphones that allows attackers to remotely inject inaudible and invisible commands into voice assistants, such as Google assistant, Amazon Alexa, Facebook Portal, and Apple Siri using light.
In our paper we demonstrate this effect, successfully using light to inject malicious commands into several voice controlled devices such as smart speakers, tablets, and phones across large distances and through glass windows.
The implications of injecting unauthorized voice commands vary in severity based on the type of commands that can be executed through voice. As an example, in our paper we show how an attacker can use light-injected voice commands to unlock the victim’s smart-lock protected home doors, or even locate, unlock and start various vehicles.
Source: Light Commands