How a Simple Hack Can Take Over Amazon Echo or Google Home Devices

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Here’s something gadget freaks might want to know: Researchers in China and the U.S. have found that hackers can take control of Amazon Echo, Google Home, and other connected home devices and virtual personal assistants by issuing commands that people cannot hear--but their digital servants can.

Think of it as a dog whistle that your pooch can hear but you cannot. Given that these target devices--which people use to order take-out food, check their bank accounts, and make phone calls--this is a bit concerning.

The technique, which Zhejiang University researchers dubbed the DolphinAttack--as dolphins also hear high frequencies people can’t--can also take control of Apple aapl Siri running on iPhones or MacBooks as well Microsoft msft Windows 10 machines. Their research was first picked by Fast Company. Another team at Princeton University was also able to take control of devices using ultrasound commands, according to the BBC.

Related: Amazon Really Wants Alexa to Rule Your Home

The slightly reassuring news here it is that to succeed, the attacker must get physically close to the target device, and put another speaker capable of transmitting ultrasonic sound near it, according to the Princeton group.

The Chinese team said they were able to use the technique on iPhones, Google goog Nexus devices, Amazon amzn Echo home speakers home speakers, and cars. And, they noted ominously, they don’t think that list is comprehensive.

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Summing it up, the Zheijiang team wrote that this work should serve as a “wake-up call to reconsider what functionality and levels of human interaction shall be supported in voice controllable systems.”

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