Unknocking write-up (CyBRICS CTF 2019 Quals)
Unknocking was a networking task on CyBRICS CTF 2019 quals. The objective of the task was to reverse engineer a port knocking daemon that implements unconventional »
GoogleCTF 2019 GPhotos writeup
Challenge description The challenge is an image storage service implemented as a PHP script. The source can be retrieved via a hidden link on the main »
DevMaster 8000 and 8001 write-up (Google CTF 2019 Quals)
DevMaster 8000 and DevMaster 8001 were sandbox challenges on Google CTF 2019 quals. The gist is it provided a compilation service over an asynchronous binary protocol. »
punchymclochface writeup (FAUST CTF 2019)
TL;DR This is a RCE-as-a-service that runs COBOL code encoded in punch card images upladed by user. Hard parts are generating valid punch card images »
If on a winters night a traveler write-up (0CTF/TCTF Quals 2019)
"If on a winters night a traveler" was a pwn task on 0CTF/TCTF Quals 2019. You have to pwn a custom buggy encryption »