KOREONETAMUctf 2026 – bad-apple Challenge Writeup
bad-apple is a web exploitation challenge that presents a Flask-based "ASCII Video Converter" application running behind an Apache HTTP Server with mod_wsgi. The application allows users to upload GIF files, which are then decomposed into individual PNG frames using ffmpeg and rendered as ASCII art in the browser. The challenge hides a flag inside a GIF file (flag.gif…
TAMUctf 2026 – bad-apple Challenge Writeup » kore.one
bad-apple is a web exploitation challenge that presents a Flask-based "ASCII Video Converter" application running behind an Apache HTTP Server with mod_wsgi. The application allows users to upload GIF files, which are then decomposed into individual PNG frames using ffmpeg and rendered as ASCII art in the browser. The challenge hides a flag inside a