hack the box

invite code

url: https://www.hackthebox.eu/invite

• inspect invite code input box element
  • find script 'src="/js/inviteapi.min.js"'
• navigate to script url (https://www.hackthebox.eu/js/inviteapi.min.js)
• run 'makeInviteCode' function in browser console
  • expand Object output
  • decode data string (base64) echo <string> | base64 -d -
  • output gives '/api/invite/generate'
• use curl to send POST request curl -X POST https://www.hackthebox.eu/api/invite/generate
  • output gives us encoded code string
• decode code string echo <string> | base64 -d -
• copy invite code into input box and submit

web

lernaean (20 pts)

• open url:port provided from instance
• proxy page through burpsuite
  • submit password to see response
    • submit root is '/'
    • response containse 'Invalid password!' string
• lernaean is the hydra from greek mythology
• hydra is a password bruteforce tool
• run a password list through hydra hydra -l "" -P <pass_list> -s <port> -f docker.hackthebox.eu http-post-form "/:password=^PASS^:Invalid password\!"
  • -l : user (blank as no username field)
  • -P : password file (used common-passwords.txt first with no luck, success with rockyou.txt)
  • -s : port
  • -f : exit when creds found
  • url (from instance)
  • service
  • root of submit, tell it to use passwords from file, login failed message (escape the !)
• once password is found submit in field
• this displays a new page
• check response in burp to find HTB flag