[https://rawsec.ml/en/HackCon-2017-write-ups/#20-xrrrr-bacche](https://rawsec.ml/en/HackCon-2017-write-ups/#20-xrrrr-bacche)

Original writeup (https://rawsec.ml/en/HackCon-2017-write-ups/#20-xrrrr-bacche).