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justCTF [*] 2020

This repo contains sources for justCTF [*] 2020 challenges hosted by justCatTheFish.

TLDR: Run a challenge with ./run.sh (requires Docker/docker-compose and might require sudo as we use nsjail extensively under the hood).

The challenges/ contains challanges directories with the following structure:

  • README.md - official challenge description used during CTF
  • run.sh - shell script to run the challenge locally (uses Docker and sometimes docker-compose)
  • public/ - files that were public/to download
  • private/ - sources and other unlisted files
  • flag.txt/metadata.json - the flag (don't look there?)
  • solv/ - scripts and files with raw solution (used by healthcheck, if exists)
  • other files

Challenges

Category Name Points Solves
web Baby CSP 406 6
web njs 394 7
web Computeration Fixed 333 14
web Go-fs 256 30
web Computeration 121 103
re REmap 383 8
re Rusty 363 10
re ABNF: grammar is fun 283 23
re debug_me_if_you_can 279 24
re reklest 164 70
re That's not crypto 50 254
pwn Pinata 474 2
pwn qmail 363 10
pwn, misc D0cker 231 38
pwn, misc MyLittlePwny 50 214
misc, stegano, ppc Steganography 2.0 500 0
misc, web, re, pwn PainterHell 500 0
misc The survey 500 0
misc, web Forgotten name 72 160
misc Sanity Check 50 764
fore, misc Remote Password Manager 347 12
fore, misc PDF is broken, and so is this file 67 166
crypto Oracles 383 8
crypto 25519 199 51

Write-ups

Write-ups can be found on CTFTime. You should also look at challenges solution directories, if they exist (solv/).

CTF Platform

We wrote our own CTF platform which is available here.

justCTF [*] 2020 was sponsored by

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