Greenwave Reality Bulbs
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This page will be dedicated to a general overview, descriptions, and information related to the Greenwave Reality TCP Connected Bulbs.
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By default this device spawns an sshd server upon boot.
The default root credentials to the Greenwave Reality TCP Connected Smart Lighting system are:
The pin-out for UART can be found on the image below.
This device ships with an open U-boot installation meaning that with a UART adapter hooked up we have access to modify the default boot parameters. This opens the device to an technique called "Kernel Init Hijacking". This technique involves modifying the "init" boot argument which when passed to the kernel specifies which script will handle the boot-up process after the kernel is loaded. By defining this variable as "/bin/sh" we tell the kernel after booting to drop to a shell over UART. This allows us temporary root access to the file system.
With the Greenwave Reality TCP Connected Lighting System, we only had to use this mode to crack the root password. This is because by default the device runs an sshd server which allows us to login if the correct credentials are known.
The credentials originally retrieved were: