Read the full write-up at http://aukezwaan.nl/2016/10/03/h4ck1t-ctf-2016-argentina-r34n1m4710n-100-points/

Original writeup (http://aukezwaan.nl/2016/10/03/h4ck1t-ctf-2016-argentina-r34n1m4710n-100-points/).