alt Hacker News> `fe80::1%a;whoami>${PATH:0:1}tmp${PATH:0:1}pwned` is a valid IPv6 IP, and if you did `ping fe80::1%a;whoami>${PATH:0:1}tmp${PATH:0:1}pwned`, you'd have the output of `whoami` written to /tmp/pwned.
Is this really a Python problem? `subprocess.run` for example defaults to `shell=False` so you have to set `shell=True`, and on top of that be building up argv?
The "default" API for `subprocess.run` has you doing `subprocess.run(["ping", ip])` which... I think just entirely avoids this problem?
There's def a general sort of "oh people will just copy/paste stuff into a shell" or the whole shell script arg escaping mess. Just feels like Python is not really doing anything bad here.
Never underestimate the power of an LLM that's spent its entire context passing its own self-generated strings to `bash`, to think "maybe the quickest way to get this done is to pass a self-generated string to `bash`."