Philadelphia CCTV Camera: Use Chromecast for rogue Amazon Echo voice control!

by CCTV Camera CCTV Camera

Screw Cayla: Use Chromecast for rogue Amazon Echo voice control!

I saw a really nice demo on the BBC this morning, where my old friend Cayla the swearing doll was used to control a door lock using voice commands. As she has no Bluetooth pairing PIN, one can easily have her speak audio commands in the victims house that a listening device will hear

The lock in the demo was probably a Yale Keyless Connected which integrates with Samsung Smart Things over Z-Wave, which there is an Alexa/Echo ‘skill’ for. That’s probably how the voice control was done.

That got us thinking about how this attack could be made a whole lot better. This ‘hack’ is limited by the following:

· Cayla isn’t always on, as she is battery powered

· If she is already paired with another Bluetooth device (i.e. the child’s smartphone) then de-auth’ing over Bluetooth can be very difficult. She will only communicate with one Bluetooth device at a time.

· It’s hard to locate Cayla dolls, as they only use Bluetooth.

· How to make it better? Use Google Chromecast, not a child’s doll!

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Why?

Chromecast is always on, as it’s attached to mains powered devices. Chromecast can also turn the TV on over HDMI if it’s already switched off. It is a Wi-Fi device, so we can locate it using Wi-Fi also has much better range than the short-range Bluetooth device in Cayla. It’s generally connected to a decent TV or audio system; so far better sound quality than Cayla’s speaker. Much more likely that Alexa will recognize the common. Chromecast has some interesting security issues that we can exploit.