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Hacking the hotel through the TV

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Security

When Adam Laurie stays at hotels, he says he can hack his way around paying for premium TV channels, the minibar and phone calls.

What's more, by connecting his laptop to certain modern hotel TV systems, Laurie says he can spy on other guests. He can't look into their rooms (yet), but depending on the system he can see what they are watching on their TV, look at their guest folios, change the minibar bill and follow along as they browse the Internet on the hotel TV.

To tease his fellow guests, he can also check them out of their room and set early wake up calls via the TV.

Laurie can do all this because of what he calls the "inverted security model" of the systems. "The TV is controlling which content I get to see. The hotel in most cases is streaming all content without any control," Laurie said in a presentation Saturday at the Defcon event for security professionals and enthusiasts here.

By plugging the hotel TV cable into a USB TV tuner connected to a laptop computer, Laurie can hack his way into the back-end systems controlling the entertainment and other convenience features found in modern hotels, he said in his presentation.

He found that many of those systems give access to information depending on an ID associated with the room's TV. By changing that ID, he said that he was able to access information for other rooms. Many of such hotel systems show guest bills, phone and room service records and offer video check-out.

Laurie found that the hotel TV systems also have special controls for hotel employees. Housekeeping staff can report a room as clean, for example. Additionally, he found that some systems let room service staff input billing for the minibar, which he now controlled.

"Sometimes you can actually control physical devices," Laurie said. In one Holiday Inn hotel he found the system controlled an electronic lock on the minibar.

While staying at a Hilton hotel in Paris, Laurie automated his hack and placed a camera in front of the TV. He snapped pictures of every screen and found out the occupancy rate of the hotel, the names of the guests, what they were paying, where they were calling and how long they had been at the hotel. He showed the pictures at Defcon, but obscured the guest names.

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