Read the full write-up at http://aukezwaan.nl/2016/10/03/h4ck1t-ctf-2016-canada-1n51d3r5-j0b-300-points/

Original writeup (http://aukezwaan.nl/2016/10/03/h4ck1t-ctf-2016-canada-1n51d3r5-j0b-300-points/).