Steps to Reproduce

In kubernetes cluster run command:

poetry run prowler kubernetes --log-level ERROR

Expected behavior

All checks are executed with no errors in parsing

Actual Result with Screenshots or Logs

One of checks is using not supported method. Log reports following line:

2025-06-05 12:37:50,411 [File: check.py:613] [Module: check] ERROR: apiserver_strong_ciphers_only -- AttributeError[29]: 'list' object has no attribute 'issubset'

How did you install Prowler?

Docker (docker pull toniblyx/prowler)

Environment Resource

Pod in on-prem kubernetes cluster

OS used

Debian 12 (as in image)

Prowler version

Prowler 5.7.1

Pip version

pip 25.1.1 from /home/prowler/.local/lib/python3.12/site-packages/pip (python 3.12)

Context

How to fix:

Edit prowler/providers/kubernetes/services/apiserver/apiserver_strong_ciphers_only/apiserver_strong_ciphers_only.py file , change type from list to set to use issubset method:

                    if command.startswith("--tls-cipher-suites"):
                        if (
-                            command.split("=")[1]
-                            .split(",")
+                            set(command.split("=")[1]
+                            .split(","))
                            .issubset(
                                apiserver_client.audit_config.get(
                                    "apiserver_strong_ciphers",
                                    default_apiserver_strong_ciphers,