Initial Access: GKE resource modified anonymously from the internet

This document describes a threat finding type in Security Command Center. Threat findings are generated by threat detectors when they detect a potential threat in your cloud resources. For a full list of available threat findings, see Threat findings index.

Overview

A potentially malicious actor used one of the following Kubernetes default users or user groups to modify a Kubernetes resource in the cluster:

system:anonymous
system:authenticated
system:unauthenticated

These users and groups are effectively anonymous. A role-based access control (RBAC) binding in your cluster granted that user permission to modify those resources in the cluster.

How to respond

The following response plan might be appropriate for this finding, but might also impact operations. Carefully evaluate the information you gather in your investigation to determine the best way to resolve findings.

To respond to this finding, do the following:

Review the modified resource and the associated RBAC binding to ensure that the binding is necessary. If the binding isn't necessary, remove it. For more details, see the log message for this finding.
To learn more about how to address this finding, see Avoid default roles and groups.

What's next

Learn how to work with threat findings in Security Command Center.
Refer to the Threat findings index.
Learn how to review a finding through the Google Cloud console.
Learn about the services that generate threat findings.