picoCTF Documentation

Level 1:
  April 23, 2018 - Internet Kitties:
    man nc to find out what nc does.
    The syntax is nc {hostname} {port}
    Typed nc shell2017.picoctf.com 12275
    Got flag
  April 23, 2018 - Piazza:
    Sign up for Piazza.
    Once process is done, go look at pinned questions for the flag
  April 23, 2018 - Leaf of the Tree:
    Have to find file with flag inside, but it is nested into a ton of folders.
    cd / to go to root directory
    cd problems
    Tab complete the long folder with a long number
    After that, continuosly type in tr and tab complete the trunk inside the folder
    Do this until it doesn't auto complete anymore and the flag file should be in your current directory
  April 25, 2018 - Looooong:
    First, nc to the server they specify.
    It will give you a random challenge to type x amount of a character follow by a number within 30 seconds.
    So, I went online to find a text repeater and activated the challenge.
    I then repeated the designated character however many times it wanted, copy pasting it into the cli with the number.
    Boom, got the flag.
  April 25, 2018 - Leaf of the Forest:
    Same as Leaf of the Tree, but with more folders.
    So, cd /
    cd problems/{long number}/forest
    find . | grep flag
    This command checks every single repository inside of Forest.
    I can then pipe the output, which is every folder inside, to grep the flag.
  April 25, 2018 - World Chat:
    After using nc to connect to the correct host and port, the cli starts outputting random text.
    I noticed that the text with the actual parts of the flag start with the words "this is part"
    So I piped the output of nc shell2017.picoctf.com 14747 to grep those specific words.
    nc shell2017.picoctf.com 14747 | grep "this is part"
    Using this command only displayed the text with the parts of the flag.
    I copy pasted each part to the input and won the challenge.
  April 27, 2018 - Bash Loop:
    There is a bash file in the /problems/995871fcb203d3e223e9e4aaa65e4053 directory
    When it is run, it states: What number am I thinking of? It is between 0 and 4096
    To give the answer, you jsut have to put the after it is run. EX. ./bashloop 49
    Researching bash loops has give me this command
    for i in {0..4096}; do ; done  
    The {0..4096} makes sure that variable i will go through 0 to 4096
    After that was confirmed, i ran the command with i as the input
    for i in {0..4096}; do ./bashloop $i; done 
    As the screen was filled to the brim with lines of text, I decided to grep flag to see if it would give me the flag
    for i in {0..4096}; do ./bashloop $i; done | grep flag 
    The response was positve, this command gave me the flag
  Just No:
  
  April 25, 2018 - What is Web:
    The challenge sends me to a website to find the pieces of a flag.
    These pieces are in the files that make a website.
    So, I inspected the website and found each part of the flag in the HTML, CSS, and Javascript files.
    I took each part and put them together.
    Which I submitted to finish the problem.
  
  April 25, 2018 -Hex2Raw:
    python.decode
    
  April 25, 2018 -ComputerAES:
    https://cryptii.com/base64-to-hex
    http://aes.online-domain-tools.com/
    
  April 25, 2018 -ComputerRSA:
    https://www.cs.drexel.edu/~introcs/Fa11/notes/10.1_Cryptography/RSA_Express_EncryptDecrypt.html
    plug in variables
  
  April 25, 2018 - Substitution: 
    https://www.guballa.de/substitution-solver
    break substitution cipher text
  April 23, 2018 - Master Challenge:
    The challenge sends you to a website that requires you to give a password
    The admin has not implemented login yet
    No matter what you enter, the response is always: Nah, that's not it
    Inspecting the page, I look for the javascript to see what hasn't been done
    Checking the password validation function, it's only function is to return false
    I change it to true and save
    Pressing the submit button after this gives me the flag