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justCTF 2023

This repo contains sources for justCTF 2023 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
  • public/ - files that were public/to download
  • private/ - sources and other unlisted files
  • private/run.sh - shell script to run the challenge locally (uses Docker and sometimes docker-compose)
  • private/flag.txt - the flag (don't look there?)
  • private/metadata.json - challenge metadata
  • private/solve.sh/private/solver/ - scripts and files with raw solution (not present for every challenge)
  • other files

Winners & Prizes

justCTF 2023 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 50 261
Misc ECC for Dummies 88 138
Misc justCTF Survey 140 87
Pwn Welcome in my house 158 74
Web eXtra Safe Security layers 173 65
Crypto Vaulted 199 51
Re Rustberry 201 50
Web Dangerous 231 38
Re manGO 253 31
Pwn nucleus 256 30
Misc ECC not only for Dummies 293 21
Misc, Pwn PyPlugins 298 20
Web Perfect Product 340 13
Re nvm 355 11
Pwn Baby Otter 363 10
Crypto Multi Auth 373 9
Pwn Mystery locker 373 9
Web Aquatic Delights 373 9
Pwn notabug 373 9
Web Phantom 373 9
Web Easy Cloud Auth 406 6
Web almost finished 406 6
Pwn notabug2 420 5
Pwn Tic Tac PWN! 435 4
Re Trial of Data 453 3
Re thiefcat 453 3
Web ESSAMTP 500 1
Misc, Web Safeblog 500 1
Web almost finished2 500 1
Misc Formula L 500 1
Misc Secure DB 500 0
Pwn Windytooth 500 0
Re Trial of Bugs 500 0

Write-ups

Write-ups created by players can be found on CTFTime as well as on our discord. You should also look at challenges solution directories, if they exist (solver.sh/solver/).

CTF Platform

Once again we used our own CTF platform which is available here with the exception of few features (notably the message system) not being pushed upstream at the time of publishing.