GKE client certificate authentication is enabled Affecting Kubernetes (Container) Engine service in Google
Severity Framework
CCSS (Common Configuration Scoring System) is a set of measures used to determine the severity of the rule.
Snyk CCSS
Rule category
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Containers/ Best Practices
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CIS-ControlsCSA-CCM
- Snyk IDSNYK-CC-00420
- creditSnyk Research Team
Description
The client certificate authentication methods is considered legacy and increase the attack surface for the cluster.
How to fix?
Set master_auth.issue_client_certificate attribute to false.
Example Configuration
resource "google_container_cluster" "allowed" {
name = "my-gke-cluster1"
location = "us-central1-a"
initial_node_count = 1
node_config{
disk_size_gb = 10
}
master_auth {
client_certificate_config {
issue_client_certificate = false
}
}
}