Researchers have discovered a new way to target voice-controlled devices by propagating ultrasonic waves through solid materials in order to interact with and compromise them using inaudible voice commands without the victims’ knowledge. The attack leverages the unique properties of acoustic transmission in solid materials to “enable multiple rounds of interactions” with the device and the attacker over a longer distance and without the need to be in line-of-sight” The results were presented at the Network Distributed System Security Symposium (NDSS) in San Diego.
Source: https://thehackernews.com/2020/03/voice-assistants-ultrasonic-waves.html