Articles by Nelson

  1. The Abyss Writeup


    In TJCTF 2018's challenge "The Abyss", you are given access to a Python 2 interpreter with heavy restrictions on your input. If you enter a string in the blacklist, ie __ (double underscore), your command will not be executed. Additionally, some builtins have been removed, and it prevents …

  2. Astana Myth - Part 1

    The Astana Challenge

    Concealed within the Book are secrets and mysteries (the “Clues”) that, once solved, reveal a hidden message (the “Solution”). The first person, or group of persons, (the “Sleuth”) to deduce the Solution in its exact …

  3. LabyREnth 2017 - 3D Maze Writeup

    LabyREnth's second annual CTF's programming track contained an interesting challenge: solve a 3D maze that will attempt to "cheat".

    LabyREnth's Maze Challenge Introduction Inside The Maze

    I decided that there would be three steps to solving this: 1. Determine how the maze cheats 2. Write code to parse the server's output 3. Implement a pathfinding algorithm

    Determining …

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