| name | cis-gcp-foundations-2.6 |
| description | Ensure That the Log Metric Filter and Alerts Exist for Custom Role Changes |
| category | cis-gcp-foundations |
| version | 4.0.0 |
| author | cyberstrike-official |
| tags | ["cis","gcp","logging","monitoring","log-metrics","alerts","iam","custom-roles"] |
| cis_id | 2.6 |
| cis_benchmark | CIS Google Cloud Platform Foundation Benchmark v4.0.0 |
| tech_stack | ["gcp"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Ensure That the Log Metric Filter and Alerts Exist for Custom Role Changes (Automated)
Description
It is recommended that a metric filter and alarm be established for changes to Identity and Access Management (IAM) role creation, deletion and updating activities.
Rationale
Google Cloud IAM provides predefined roles that give granular access to specific Google Cloud Platform resources and prevent unwanted access to other resources. However, to cater to organization-specific needs, Cloud IAM also provides the ability to create custom roles. Project owners and administrators with the Organization Role Administrator role or the IAM Role Administrator role can create custom roles. Monitoring role creation, deletion and updating activities will help in identifying any over-privileged role at early stages.
Impact
Enabling of logging may result in your project being charged for the additional logs usage.
Audit Procedure
Using Google Cloud Console
Ensure that the prescribed log metric is present:
- Go to
Logging/Logs-based Metrics by visiting https://console.cloud.google.com/logs/metrics.
- In the
User-defined Metrics section, ensure that at least one metric <Log_Metric_Name> is present with filter text:
resource.type="iam_role"
AND (protoPayload.methodName="google.iam.admin.v1.CreateRole"
OR protoPayload.methodName="google.iam.admin.v1.DeleteRole"
OR protoPayload.methodName="google.iam.admin.v1.UpdateRole"
OR protoPayload.methodName="google.iam.admin.v1.UndeleteRole")
Ensure that the prescribed alerting policy is present:
- Go to
Alerting by visiting https://console.cloud.google.com/monitoring/alerting.
- Under the
Policies section, ensure that at least one alert policy exists for the log metric above. Clicking on the policy should show that it is configured with a condition. For example, Violates when: Any logging.googleapis.com/user/<Log Metric Name> stream is above a threshold of zero(0) for greater than zero(0) seconds means that the alert will trigger for any new owner change. Verify that the chosen alerting thresholds make sense for the user's organization.
- Ensure that the appropriate notifications channels have been set up.
Using Google Cloud CLI
Ensure that the prescribed log metric is present:
- List the log metrics:
gcloud logging metrics list --format json
