Puissance 4

intro pwn x86/x64 stack FCSC 2026 solved on

Description

If you succeeded with the “baby version, now try this one, which is just a tiny bit more complex. Your goal is still to read the flag.txt file located on the server.

Files

  • docker-compose.yml
  • puissance4
    20.11 KiB – 2eee55f7c3220cfa99ccd8d9d34f222fb5af35410f618f30f618c0d837008d7c
  • ld-2.41.so
    220.31 KiB – 0de72615c3b0d9bf39f7dc7ec52f18b4b83bcfda7837c8916cd3de162e6f4dc9
  • libc-2.41.so
    1.91 MiB – 06e87bc6946702848d7f6aeb7e3759ca904458efd8c3ded85ca63099944181ed

Author

Cryptanalyse

Challenge Instructions

  1. First, download docker-compose.yml:
    curl https://hackropole.fr/challenges/fcsc2026-pwn-puissance4/docker-compose.public.yml -o docker-compose.yml
  2. Launch the challenge by executing in the same folder:
    docker compose up
  3. Then, in another console, access the challenge with Netcat:
    nc localhost 4000
⚠️ Important: You must solve the challenge by interacting with the Docker container through the exposed network port. Any other way is not considered valid.

In case you encounter problems, please consult the FAQ.

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Writeups

There are no public solutions for this challenge yet, but you can submit yours after getting the flag.