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There is something definitely happening, but was not sure what and how. I typed in “television `sleep 0`” and tried it again.
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Maybe the TV did not expect them and threw an error which prevented it from loading. I thought it might have something to do with the backtick characters I injected. The time did not match my input as it was way longer than five seconds.
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It’s not odd for my TV to hang for a few seconds before changes are made, but because now it took a longer time to become responsive, it made me curious. I didn’t really think that I had just found a command injection or something similar. Once it was responsive again I changed the name so I could select other menu entries. So I thought it would be fun to rename my TV to “television `sleep 5`”.Īfter entering and submitting the payload from my remote, the settings menu just froze for a long time. It might be a GET parameter on your router’s web interface, the control panel of your new printer, or, in my case, a TV. When you work in Information Security, you can’t help but to test some payloads you use on a daily basis on other input fields you encounter. The Vulnerability in My Smart Television Set Then something else caught my attention I could actually give my TV set a name. I opened it and only saw some more version numbers. Within the settings, there was a category called “info”. I could only activate “Hotel Mode” and view the version number of the set. Almost all of the categories it showed weren’t accessible.
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After a quick Google search on my mobile phone I found out that this brand of televisions has a code that opens a hidden menu.Īfter opening the settings and typing in the code on my remote control, another menu popped up on the left side of the screen.
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But while setting the timer I wondered about other possible menu functions, and if there any hidden features that are only meant for the support team or the developers. Since I was very tired, I just wanted to set the sleep timer on the television and lie down. Finding a flaw in such a device is always quite fun because you often see things that aren’t meant to be seen by the users, except the developers and maybe the company’s tech support team. I was tired but kept on thinking about a vulnerability I found earlier on in a router someone gave me. It was one of those lazy evenings, just watching TV after a long day.