May the Forth

Description

A zForth user refuses to update his installation, because he says ‘it is useless’. Can you convince him to do it anyway by finding the flag in the interpreter environment (variable FLAG)?

Note: A more complex variant of this challenge is available here: May The Fifth.

Files

docker-compose.yml
may-the-forth
40.79 KiB – 2dc120c7370df89fe9361bb29bcc110ca9d8a2b8b26e4c589aa9e86fb313398f
may-the-forth-public.tar.xz
12.46 KiB – ea55eb740622ed0d5234fcdf65fcd99cf83aa4d2bfa2a125441661f131fe66ac

Author

cde

Challenge Instructions

First, download docker-compose.yml:
curl https://hackropole.fr/challenges/fcsc2023-pwn-may-the-forth/docker-compose.public.yml -o docker-compose.yml
Launch the challenge by executing in the same folder:
docker compose up
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.

Flag

You don't have JavaScript actived. No problem! You can check your flag like this: echo -n 'PUT_THE_FLAG_HERE' | sha256sum # possible output: b0106e548e2a1d6532c3895991d234231a679af0186b9868c2beb6c1e1d2cb4b

Writeups

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