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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

Challenges

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

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

CTF Platform

We wrote our own CTF platform which is available here.

People involved in organizing justCTF 2019 (alphabetical order)

justCTF 2019 was sponsored by

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