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 »
refrain write-up (0CTF/TCTF Quals 2019)
refrain was a misc task at 0CTF/TCTF Quals 2019 where you had to reconstruct input data from a program trace. A single file was given: »
0CTF/TCTF 2019 Quals: Sixology write-up
Sixology was a reverse task which 2 teams managed to solve during the CTF. You can find summary section (TL;DR) as well as some links »
Diagon Alley write-up (FAUST CTF 2018)
Overview This task is a service which is running on team's vulnbox (server). It can be seen in traffic that check system frequently connects to service »