Beware of Inaudible Ultrasound Attacks on Phones and Smart Speakers
Researchers have discovered a new technique called Near-Ultrasound Inaudible Trojan (NUIT) that can be used to silently take control of phones, smart speakers, or any device with a digital assistant. NUIT plays sounds in the near-ultrasound frequency range (16kHz-20kHz) to give voice commands to smart devices, some commands take less than a second to play. The attack was tested on digital assistants including Alexa, Cortana, Google Assistant, and Siri. The researchers will present more details about the study at the USENIX Security Symposium in August.