This is Max Kellermann's proof of concept for Dirty Pipe, but modified to overwrite root's password field in /etc/passwd and restore after popping a root shell.

Side Note: I do not claim any credit for finding this vulnerability or writing the proof of concept. This exploit is merely a small modification of Kellermann's proof of concept to enable quick/easy exploitation. Please read the original article on this extremely interesting vulnerability @ https://dirtypipe.cm4all.com/ when you get the opportunity. It really does deserve your time to understand it.

1. Compile with ./compile.sh (assumes gcc is installed)
2. Run ./exploit and it'll pop a root shell

If you get this error message:

1. Login as root with the password aaron.
2. Then, restore /etc/passwd by running mv /tmp/passwd.bak /etc/passwd

(oops sorry my laptop battery is dying and my charger broke so I don't have time to fix this the right now, sorry)