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Sourcetoad CTF 2021

Produced by @iBotPeaches (Connor Tumbleson), for a Q4 2021 Engineer challenge.

  • Originally hosted on CTFd.io with a combination of some t3.nano instance on AWS
  • Most puzzles were simple index.html files leading to assets/images/files.
  • Complex puzzles leveraged the services feature of CTFd to deploy a docker image.
  • Completed on December 3, 2021 at Sourcetoad with all Engineers.
  • web/challenges - each folder represents a challenge.
  • web/common - Styles used by all challenges.
  • setup - any non-public setup (mysql, etc) needed for a challenge.
  • notes - any notes/partial solves for the challenge to help for the solution.
  • solutions - written guides for all puzzles (to help teach afterwards).
  • ctf - The challenge.yml specification built files for CTFd.

Intro

  • This repo exists to make building the CTF easier. It has no real automation to spin up.
  • The real setup for this for our CTF required a few AWS servers and a mix of Apache/Nginx.
  • CTFd was used for this original event.
  • It may be open sourced afterwards, because all of these puzzles might be helpful to others to train/learn
    • They were all made from hints of others or just simply made up

Flags

See FLAGS.md, but I encourage first reading the solutions directory for explanations.

Points

  • Easy - 100
  • Normal - 150
  • Medium - 250
  • Medium Hard - 400
  • Hard - 600
  • Very Hard - 1000
  • Extreme - 2000
  • Ultimate - 3000

Hints

  1. N/A
  2. Alt Text (Base64)
  3. JS Auth - Look up atob
  4. Caesar Cipher
  5. Exif Data
  6. Hex Editor -> OutGuess
  7. Hex -> Binary
  8. SQL Injection (OR)
  9. Cookies / Serialization
  10. DNS TXT Record
  11. robots.txt
  12. Hex (Reversed) -> Binary
  13. RSA-Crack
  14. XSS
  15. XXE
  16. Hex Editor / Strings Command
  17. SQL Injection (UNION)
  18. Brain F*ck
  19. URL Manipulation
  20. IHDR
  21. Stack Smashing
  22. RFC4229
  23. SSRF
  24. User-Agent
  25. CVE-2021-3129
  26. SSSS
  27. Mass Assignment
  28. Binary via colors?
  29. dotenv
  30. CVE-2021-21263
  31. #544f41 = TOA
  32. security.filesystem.nullbytes.php
  33. 17 Mistakes Microsoft Made in the Xbox Security System
  34. OR 1=1

CTFD Setup

  • All challenges should be in dynamic point mode, but never lose more than 15% of their score.
  • IE (A 1000 point question can only decay to 850)
  • All hints should cost a max of 15% of the question
  • Categories are Web / Steganography / "File/Text" / Cryptography / RE / Laravel

Thanks

  • Sourcetoad for funding CTFd license
  • Sourcetoad for giving 4 hours with all engineers for a challenge.
  • We (Sourcetoad) may be hiring. Take a look!