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

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

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

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

We wrote our own CTF platform which is available here.

justcatthefish/justctf-2022