Google Assistant may be vulnerable to attacks via subsonic commands
12 May, 2018, 07:47 | Author: Becky Perry
The New York Times reports that researchers in China and the USA have discovered a way to surreptitiously activate and command those virtual assistants by broadcasting instructions that are inaudible to the human ear.
The researcher added that he's confident he and his colleagues will eventually be able to attack any smart device.
They used a technique called DolphinAttack, which translates voice commands into ultrasonic frequencies that are too high for the human ear to recognize.
"We wanted to see if we could make it even more stealthy", said UC Berkeley fifth-year computer security Ph.D. student Nicholas Carlini, one of the authors of the research that has been published online. They say that they have created a way to get rid of sounds that would normally be heard by Google Assistant, Siri and Alexa, and replace them with audio files that can not be heard by the human ear. It's a fair warning to companies designing digital assistant to get out in front of the problem rather than be reactionary. The attack first muted the phone so the owner wouldn't hear the system's responses, either.
The secret commands can instruct a voice assistant to do all sorts of things, ranging from taking pictures or sending text messages, to launching websites and making phone calls. During the Urabana-Champaign, they showed that though commands couldn't yet penetrate walls, they still had the potential to control smart devices through open windows in buildings.
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What these research studies prove is that it's possible to manipulate speech recognition gadgets by making minute changes to speech or other audio files. The group provided samples of songs where voice commands have been embedded to make digital assistants do specific things, including visiting websites, turning on Global Positioning System, and making phone calls.
While the commands may go unheard by humans, the low-frequency audio commands can be picked up, recovered and then interpreted by speech recognition systems.
They were able to hide the command, "O.K. Google, browse to evil.com" in a recording of the spoken phrase, "Without the data set, the article is useless".
They also embedded other commands into music clips.
"Companies have to ensure user-friendliness of their devices, because that's their major selling point", said Tavish Vaidya, a researcher at Georgetown.
But Carlini explained their goal is to flag the security problem - and then try to fix it.
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