[https://infosec.rm-it.de/2017/11/19/hxp-ctf-2017-irrgarten/](https://infosec.rm-it.de/2017/11/19/hxp-ctf-2017-irrgarten/)

Original writeup (https://infosec.rm-it.de/2017/11/19/hxp-ctf-2017-irrgarten/).