New research shows Siri, Alexa vulnerable to hackers

Researchers from University of Michigan claim that voice-controlled digital assistants like Apple’s Siri, Amazon’s Alexa and Google Home may be vulnerable to hackers from hundreds of feet away.
3:24 | 11/05/19

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Transcript for New research shows Siri, Alexa vulnerable to hackers
Now to new research showing how easy it can be to hack your home. Researchers say they found a way to take control of voice assistants like Google home, Amazon Alexa and even some phones just by shining a laser pointer. T.J. Holmes is here with more and a speaker in hand. You know, there have been safety concerns about these but it has to do with privacy. Are they regarding you? This is altogether different. Hackers can take over your now, that might not sound like a big deal if all you do is say, hey, play my music. What's the weather. You know what other people do with these, hey, unlock my front door, hey, open my garage and now hackers can take over your voice assistant without saying a word. Alexa, dim the lights. Okay. Reporter: A new warning this morning for anyone using Alexa, siri, Google home or any of those wildly popular voice controlled digital assistants. Researchers claim they found a flaw that allows hackers to access your device from hundreds of feet away giving them the ability to potentially unlock your front door, even start your car. It's 9:43. Reporter: Watch as researchers from the university of Michigan access a smart assistant and force it to open a garage door by pointing a laser. Okay, opening. Reporter: In their new study revealed Monday researchers say they were able to take over Google home, Amazon's Alexa and apple's siri devices from hundreds of feet away using lasers to simulate audio signals, essentially tricking the device's microphone into thinking it was hearing sound. Daniel ginkin is one of the researchers behind it. I was surprised the microphone interpreted the injected light as sound. Basically the microphone heard light. Reporter: At one point it claims researchers were able to take over a voice assistant from more than 350 feet away allowing them to open the front doors protected by a smart lock and turn lights on and off. They even had access to make online purchases and had access to remotely unlock and start a car connected to one of the devices. We can basically get full control over the smart speaker. Reporter: We reached out to all three companies. Google tells ABC news they are closely reviewing this research paper adding they are always looking at ways to improve the security of our devices. And Amazon tells us they'll continue to engage with the authors to understand more about their work adding they take customer security and the security of our products seriously. And I want to be clear, I have one of these sitting by George. No one is going to take a little laser pointer and go by your front door and do that and set the thing off. That's not what we're talking about. It takes specialized equipment and you have to have a laser focus. They had to have a tripod and telephoto lens. I did an experiment yesterday and found a fix. Don't put it next to the window at your house. Problem solved. It really is that simple. It shouldn't be, okay, you shouldn't have to. They want them to change the microphones but if you're concerned don't put it next to a window. Four minutes to get to the most important point. I like to keep you in your seat, George. You're welcome. Thank you, T.J. That's awesome As always.

This transcript has been automatically generated and may not be 100% accurate.

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