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Hackers at DefCon have exposed new security concerns around smart speakers. Tencent’s Wu HuiYu and Qian Wenxiang spoke at the security conference with a presentation called Breaking Smart Speakers: We are Listening to You, explaining how they hacked into an Amazon Echo speaker and turned it into a spy bug.

The hack involved a modified Amazon Echo, which had had parts swapped out, including some that had been soldered on. The modified Echo was then used to hack into other, non-modified Echos by connecting both the hackers’ Echo and a regular Echo to the same LAN.

This allowed the hackers to turn their own, modified Echo into a listening bug, relaying audio from the other Echo speakers without those speakers indicating that they were transmitting.

This method was very difficult to execute, but represents an early step in exploiting Amazon’s increasingly popular smart speaker.

The researchers notified Amazon of the exploit before the presentation, and Amazon has already pushed a patch, according to Wired.

Still, the presentation demonstrates how one Echo, with malicious firmware, could potentially alter a group of speakers when connected to the same network, posing concerns with the idea of Echos in hotels.

Wired explained how the networking feature of the Echo allowed for the hack:

If they can then get that doctored Echo onto the same Wi-Fi network as a target device, the hackers can take advantage of a software component of Amazon’s speakers, known as Whole Home Audio Daemon, that the devices use to communicate with other Echoes in the same network. That daemon contained a vulnerability that the hackers found they could exploit via their hacked Echo to gain full control over the target speaker, including the ability to make the Echo play any sound they chose, or more worryingly, silently record and transmit audio to a faraway spy.

An Amazon spokesperson told Wired that “customers do not need to take any action as their devices have been automatically updated with security fixes,” adding that “this issue would have required a malicious actor to have physical access to a device and the ability to modify the device hardware.”

To be clear, the actor would only need physical access to their own Echo to execute the hack.

While Amazon has dismissed concerns that its voice activated devices are monitoring you, hackers at this year’s DefCon proved that they can.