Avoid binding RBAC roles to all authenticated users

Méthode de vérification

Méthode d'audit: Commande shell

out=$(kubectl get clusterrolebindings,rolebindings -A -o go-template='{{range .items}}{{$b:=.metadata.name}}{{range .subjects}}{{if eq .name "system:authenticated"}}{{$b}}{{"\n"}}{{end}}{{end}}{{end}}') || exit 1
bad=$(printf '%s\n' "$out" | grep -v '^$' | grep -Evx 'system:basic-user|system:discovery|system:public-info-viewer' | sort -u)
if [ -z "$bad" ]; then echo compliant; else printf '%s\n' "$bad" | head -n 25; fi

Sortie attendue

compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Remove any non-default binding to system:authenticated identified in the audit and replace it with explicit, least privilege access for specific authenticated subjects. Do not remove the expected default ClusterRoleBindings system:basic-user, system:discovery, or system:public-info-viewer. RBAC permissions should be granted through defined users, groups, or service accounts rather than the broad system:authenticated group. • Review each non-default RoleBinding or ClusterRoleBinding returned by the audit and identify the referenced Role or ClusterRole • Determine the specific API groups, resources, verbs, and namespace scope required for the affected users, tools, or automation • Create or update a least privilege Role or ClusterRole that grants only the required access • Bind the replacement role to a specific user, Google Group, IAM service account, or Kubernetes service account • ...

Vérifier cet hôte

Exécutez cette commande sur une machine que vous êtes autorisé à auditer. L'analyse est en lecture seule.

tmaegis scan --target gke