If you can provide the specific source code or a link to the binary, I can give you a precise exploit script. Otherwise, here is a general template for a binary exploitation write-up of this nature: Target: A binary executable (often 32-bit or 64-bit ELF). Goal: Read the flag.txt file on the remote server.
(or "pico 300alpha2"), focusing on a critical directory traversal vulnerability that impacts its static server component. pico 300alpha2 exploit link