Find the address of the string "/bin/cat flag.txt" – we can place it in the overflow buffer itself (it’s after the saved return address, so it will be on the stack and its address is known after we calculate the offset).
$ r2 -A juq399 [0x00400560]> aaa [0x00400560]> pdf @ main juq399
Mara set a trembling hand on the lid. The moment she touched it, light skittered across the floor—tiny motes that rushed outward and coalesced into a thin projection, like the ghost of a map. Paths glowed, converging on a single pulsating star deep in the city. The projection breathed, then spoke in a voice like paper turning pages. Find the address of the string "/bin/cat flag
Because this is a specific media title rather than a technical process or game, a "guide" typically refers to identifying the key details of the production. Title ID: JUQ-399 Studio: Madonna (Official Website) Release Category: Mature / Drama Paths glowed, converging on a single pulsating star