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justCTF 2022

This repo contains sources for justCTF 2022 challenges hosted by justCatTheFish as well as summary of winners and sponsors of the event.

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

Winners & Prizes

  • 1st place - C4T BuT S4D - $3200 + 1x Binary Ninja Personal

  • 2nd place - Never Stop Exploiting $1500 + 1x Binary Ninja Personal

  • 3rd place - 0ops - $1000 + 1x Binary Ninja Personal

  • 4-8th place - DiceGang, r3kapig, Water Paddler, idek - 1x Binary Ninja Personal

  • We also give a 1x Binary Ninja Personal license for the best writeup that uses Binary Ninja

  • We also provided $50 for each of the two unsolved challenges to the first winners

justCTF 2022 sponsors:

Thanks again to all the sponsors who made this event possible!

Challenges

(Sorted from most solved to least solved)

Category Name Points Solves
Misc Sanity Check 50 316
Misc Bifurcation (ppc) 103 121
Web Symple Unzipper 225 40
Crypto Frosty 228 39
Pwn Notes 256 30
Crypto Simply Powered 260 29
Pwn arm 267 27
Crypto fROSty's Second Signature Scheme 275 25
Misc Hardware Screen 279 24
Re I'm slow 283 23
Web Velociraptor 288 22
Misc Radio Ga Ga 288 22
Web GoBucket 308 18
Misc, Pwn dumpme 333 14
Pwn Skilltest 340 13
Web, Misc gitara 347 12
Pwn League of Lamports 373 9
Web Baby XSLeak 394 7
Re AMXX 406 6
Re, Pwn Monsters 406 6
Web Foreigner 420 5
Pwn herpetology 435 4
Web, Misc Web API intended 435 4
Re, Misc Fancy Device 453 3
Web Ninja 500 1
Pwn Dark SOLs 500 0
Web Dank Shark 500 0

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.