1. Set up a Ruby environment (tested with Ruby 3.2.0). It's recommended to use a virtual environment using ASDF-VM.
2. Install dependencies: bundle install.
3. Run! (see below)

Start the vulnerable app:

VULN=on bundle exec rackup -s puma

Start the fixed app: (requires a configured dnsmasq, see the solution article)

VULN=off bundle exec rackup -s puma

Challenge announcement:

• 🇫🇷 https://twitter.com/acceis/status/1670810535300853766
• 🇬🇧 https://twitter.com/acceis/status/1670810537947529219

Solution article:

• 🇫🇷 https://www.acceis.fr/solution-de-lextrait-de-code-vulnerable-n5
• 🇬🇧 https://www.acceis.fr/solution-for-the-vulnerable-code-snippet-n5