Voilà

misc FCSC 2025 solved on

star

Description

Alice loves listening to music. Unfortunately, she misconfigured her firewall and accidentally exposed her music collection on the Internet.

Alice organizes her personal collection in an unconventional way: instead of sorting by genre, album, or artist, she renames her music files based on her imagination.

She assures you that you won’t be able to find the real name of the song associated with the file flag.opus. Prove her wrong.

The flag format is: FCSC{Artist_Song}. For example: FCSC{ABBA_Gimme! Gimme! Gimme! (A Man After Midnight)}. The flag is not case-sensitive.

Alice’s music collection is accessible at localhost:4000.

This challenge is also available in an easier version: Voilà (Baby).

Files

Author

erdnaxe

Challenge Instructions

  1. First, download docker-compose.yml:
    curl https://hackropole.fr/challenges/fcsc2025-misc-voila/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.

Flag

Share my success on Fediverse, Twitter, Linkedin, Facebook, or via email.

Submit your solution

You can submit your writeup for this challenge. Read the FAQ to learn how to proceed.

You need to be logged in to submit a writeup.

Writeups

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