Giving up your Wi-Fi password can be giving up more control than you think. Because of the way Chromecast and other IoT devices communicate, anyone on the same Wi-Fi network as your device can often make it do whatever they want. With a script called "Cast All the Things," we can hijack a Chromecast to play nearly any kind of media with a single command in terminal.
IoT (Internet of Things) devices are notorious for making compromises on security for the sake of convenience, rendering them particularly easy to attack. A perfect example is the Chromecast, which can be effectively hijacked by any device on the same local network that knows how to talk to it.
Media devices like a Chromecast are controlled by simple application programming interfaces (APIs) designed to be controlled by messages from a user's smartphone. These are usually sent to the Chromecast as the user operates a mobile application with an interface for controlling the device. In most cases, these messages don't require any password to execute, so the Chromecast will react precisely the same if you send it commands directly — without involving the official app.
IoT Devices Use Vulnerable Messaging to Communicate
Internet of Things devices are everywhere, and many of them use lightweight messaging standards like MQTT to communicate over Wi-Fi. This standard is kind of like Twitter for Wi-Fi — short, simple pre-formatted messages that can quickly pass between devices in a mesh network. A mesh network allows groups of IoT devices to pass messages between each ..
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