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justCTF 2024 Teaser

This repo contains sources for justCTF 2024 teaser 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

Top 3 teams: 1x IDA Pro named license for a year with 2 decompilers Top 6 teams: 1x Burp Suite Professional license for a year + reimbursement of travel expenses for 4 people to the finals

justCTF 2024 Teaser 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 50 419
Misc, Pwn HaSSHing 174 64
Crypto Reverse Cryptographing 178 62
Web Piggy 180 61
Re, Misc Star 201 50
Web justPocketTheBase 215 44
Crypto Duality 237 36
Blockchain The Otter Scrolls 246 33
Fore, Misc Baby SoC 256 30
Blockchain World of Ottercraft 271 26
Blockchain Dark BrOTTERhood 275 25
Web Bypass Backlash: Route Exploration 283 23
Re, Misc just TV 326 15
Ppc Wild West 355 11
Crypto, Pwn interlock 355 11
Fore, Misc Budget SoC 363 10
Misc, Web Casino 394 7
Misc leaving soon 406 6
Misc, Pwn yapj 435 4
Pwn q3vm 435 4
Web Another Another CSP 500 1
Web Letters 500 0
Pwn Blu Ray of Death 500 0
Re Cursed Protocol 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/).