Well, I plan to try and confirm my method of entry still exists on current firmware before bothering to talk to Tesla about anything. I have a feeling it's been patched... and if it hasn't, someone is slacking pretty badly. This was one of those times where I literally facepalmed when I saw the root@cid-5xxxxxxxxxxxxxxx# prompt... mainly because I had initially thought to try it but assumed it'd be a waste of time and wouldn't work.
A well known Ubuntu vulnerability?