* set latch to `__printf_chk` GOT
* leak libc by printing `vga->vs[0x10]`
* overwrite with magic gadget

Full writeup at https://devcraft.io/2018/11/22/q-escape-seccon-2018.html

--vakzz

Original writeup (https://devcraft.io/2018/11/22/q-escape-seccon-2018.html).