We just participated in the "Nuit du Hack" CTFs the two last weekends. CTFs, with a "s", because there was two of them : a private and a public CTF. The 23 june was the "Nuit du Hack" event, and it was originally planned that the two CTFs take place here, in the same time, but unfortunately the public CTF was reported to the next weekend because of technical issues.

* Private CTF :

This was an attack/defense CTF ! Each team (13 in total) had a server with a dozen of services to patch/protect/attack.
We successfully exploited some webapp, and a so called "pastebin" challenge (a RCE caused by an overflow in a log parsing program), which played an important role in this CTF as we'll see :)

Unfortunately for us, at some time of the night (~ 3h30), almost all teams lost access to their VM, and without really knowing what was the cause of this situation, the staff decided to prematurely stop the CTF. So after validating our preciously keeped flags (~ 20 :p) we finished at the 2nd place with 4250pts, just behind HackerDom with 4960pts. This is not a bad score, but this left us with a slight taste of biterness when we latter learned what really happened : a team actually launched a fork bomb on the pastebin service (him again !) shutting down all the unpatched teams (More information : here(EN), here(EN), here(EN), here(EN), here(FR), here(FR) and here)

Since the pastebin was the one causing so much trouble, we wrote a little write-up that you can find here :)


* Public CTF :

So the public challenge was reported to the next weekend, and lasted 48h. This time it was a "classic" CTF, with some challenges to solve in categories like WebApp, Crackme, Forensics, Stegano or Crypto.
This time we finished 1st, with a total of 13710 points, by solving 23 out of 28 challenges \o/
You can find a few write ups here :