Hacking the UART - Finding and gaining access to the console port on embedded gadgets!

[@vadimemelin2941]

Omg, that's a LOT of experience condensed into a single 6 minutes video, this is really a treasure

[@wltechblog]

I worry about moving too fast sometimes!

[@vadimemelin2941]

@@wltechblog can't talk for the rest of folks, but I believe that you've done amazing job on compiling general information with your professional experience to 6 minutes video! You might want to actually expand the video to at least 10 minutes to have it eligible for monetization, but that's up to you

[@wherami]

awesome, thank you! clever on how to determine TX vs RX. that makes sense the second you said it. Really appreciate the bps and config settings.

[@wltechblog]

Glad it was helpful!

[@angeltodorov4577]

Why does flow control need to be disabled?

[@wltechblog]

Hardware flow control requires 2 additional pins between devices, Clear To Send and Request To Send, which aren't present in our 3 pin UART connection. Software flow control (xon/xoff or Transmit On/Transmit Off) sends control characters over the serial line but is generally not implemented or enabled in these situations.

[@alirezataherpour1808]

Please how to change mac address and reset password in uart mode?? What's code??

[@wltechblog]

Changing the MAC is going to depend ont he userland firmware, the bootloader generally doesn't set it. As far as a pssword change, you may be able to change the bootargs to replace init with /bin/sh and get a root shell, but there are likely several extra steps required to getting a permanent password change.

[@romanmoschenski9453]

Why the hell are hardware manufactures do not disable CONFIG_SERIAL_CORE_CONSOLE in production Linux kernels? Its just a one line to be removed in .config file

[@wltechblog]

Engineers are lazy, and that's an extra step with no clear benefit... It's not like randos on the internet are going to take them apart right?

[@DrGeta666]

Why are you following someone else’s video? You can still hear it in the background. You even say “let’s enjoy the boot loader” the same as the other video

[@wltechblog]

That's my own video, the audio came out poorly so I recorded again as a voiceover. I guess I didn't fully mute the original audio for that part!