justCTF [*] 2020
This repo contains sources for justCTF [*] 2020 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 CTFrun.sh– shell script to run the challenge locally (uses Docker and sometimes docker-compose)public/– files that were public/to downloadprivate/– sources and other unlisted filesflag.txt/metadata.json– 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 |
|---|---|---|---|
| web | Baby CSP | 406 | 6 |
| web | njs | 394 | 7 |
| web | Computeration Fixed | 333 | 14 |
| web | Go-fs | 256 | 30 |
| web | Computeration | 121 | 103 |
| re | REmap | 383 | 8 |
| re | Rusty | 363 | 10 |
| re | ABNF: grammar is fun | 283 | 23 |
| re | debug_me_if_you_can | 279 | 24 |
| re | reklest | 164 | 70 |
| re | That’s not crypto | 50 | 254 |
| pwn | Pinata | 474 | 2 |
| pwn | qmail | 363 | 10 |
| pwn, misc | D0cker | 231 | 38 |
| pwn, misc | MyLittlePwny | 50 | 214 |
| misc, stegano, ppc | Steganography 2.0 | 500 | 0 |
| misc, web, re, pwn | PainterHell | 500 | 0 |
| misc | The survey | 500 | 0 |
| misc, web | Forgotten name | 72 | 160 |
| misc | Sanity Check | 50 | 764 |
| fore, misc | Remote Password Manager | 347 | 12 |
| fore, misc | PDF is broken, and so is this file | 67 | 166 |
| crypto | Oracles | 383 | 8 |
| crypto | 25519 | 199 | 51 |
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.
