Title: Hackers' Camp 2E
This challenge is rendered as real as possible and there's a risk it might be exploited. If you found a hole, be kind and let us know.
I sought quangntenemy's help to be the first to try it - without any first-hand knowledge from me about the challenge. He solved it and gave suggestions to make it more secure.
Great thanks to quangntenemy.
Any bugs that remain are purely mine :)