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

1st place - r3kapig - $3200
2nd place - Never Stop Exploiting - $1500
3rd place - SKSD - $1000

justCTF 2023 sponsors:

Trail of Bits - https://www.trailofbits.com/
OtterSec - https://osec.io/
SECFORCE - https://www.secforce.com/
isec - https://www.isec.pl/

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/).

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