justCTF 2019

This repo contains sources for justCTF 2019 challenges hosted by justCatTheFish.

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
README-internal.md - internal challenge readme, might contain spoilers or description how to launch given challenge
flag.txt - the flag (don't look there?)
solv/ - scripts and files with raw solution (used by healthcheck, if exists)
other files

Category	Name	Points	Solves	Author
Web	Cache Review	500	0	cypis
Web	Scam generator FIXED	500	1	terjanq
Web	Ugliest Website	474	2	terjanq
Web	Scam generator	474	2	terjanq
Web	Cache review but with no presents	435	4	cypis
Web	Ugly website	293	21	terjanq
Web	FirmwareUpdater	106	118	ahpaleus
RE	Walking Simulator	474	2	Tacet
RE	GoSynthesizeTheFlagYourself	453	3	stawrocek
RE	CHANGE_VM	347	12	stawrocek
RE	FSMir 2	197	52	Altair
RE	FSMir	154	77	Altair
Pwn, RE	Safe notes	500	1	Tacet
Pwn	ATM service	394	7	Disconnect3d
Pwn	Shellcode Executor PRO	283	23	rand0w
Pwn	Phonebook	283	23	Lacky
Misc, Stego	catto	420	5	Altair
Misc, PPC	RSA Exponent	326	15	Tacet
Misc, PPC	Dominoes	199	51	terjanq
Misc	Discreet	373	9	Altair
Misc	wierd signals	314	17	soltys
Misc	Will it stop?	283	23	mzr
Misc	md5service	263	28	terjanq
Misc	Matryoshka	157	75	soltys
Misc	Sanity check	50	296	----
Crypto	GCM	500	1	Gros
Crypto	p&q Service	453	3	terjanq
Crypto	Fault EC	394	7	Gros

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.

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