Command injection in image conversion
An AI assistant wrote a small Python utility that converts an uploaded image using ImageMagick by shelling out. It works on your test files. What's the injection risk, what filename would trigger it, and how do you fix it?
Implement
build_convert_argv(filename: str) → list[str]Examples
in
["photo.jpg"]out["convert","uploads/photo.jpg","-resize","200x200","thumbs/photo.jpg"]in
["x.jpg; rm -rf ~ #"]out[]in
["my-photo_2.PNG"]out["convert","uploads/my-photo_2.PNG","-resize","200x200","thumbs/my-photo_2.PNG"]What a strong answer looks like
Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it (tests, edge cases, reading critically), and how you’d re-prompt or decompose to get it right.
0:00 of about 14 min
Vibe & agentic: describe the solution in plain language (or narrate it) and the coach grades your approach.
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.