Minimize the admission of containers with allowPrivilegeEscalation

AltaNivel 1Automatizadaaks

Descripción

Minimize the admission of containers with allowPrivilegeEscalation=true so that users, groups, and service accounts with deployment rights cannot broadly create pods, init containers, or other workload objects that permit a process to gain more privileges than its parent. Requires kubectl with cluster-wide read access (KUBECONFIG); system namespaces are excluded and listed resources must be remediated or documented as exceptions. Containers with allowPrivilegeEscalation: true are reported.

Cómo se verifica

Método de auditoría: Comando de shell

shell

out=$(kubectl get pods -A -o go-template='{{range .items}}{{$ns:=.metadata.namespace}}{{$p:=.metadata.name}}{{range .spec.containers}}{{$ns}} {{$p}} {{.name}} {{with .securityContext}}{{.allowPrivilegeEscalation}}{{end}}{{"\n"}}{{end}}{{range .spec.initContainers}}{{$ns}} {{$p}} {{.name}} {{with .securityContext}}{{.allowPrivilegeEscalation}}{{end}}{{"\n"}}{{end}}{{range .spec.ephemeralContainers}}{{$ns}} {{$p}} {{.name}} {{with .securityContext}}{{.allowPrivilegeEscalation}}{{end}}{{"\n"}}{{end}}{{end}}') || exit 1
bad=$(printf '%s\n' "$out" | awk -v ex='^(kube-system|kube-public|kube-node-lease|gatekeeper-system|azure-arc)$' 'NF && $1 !~ ex && ($4=="true")')
if [ -z "$bad" ]; then echo compliant; else printf '%s\n' "$bad" | head -n 25; fi

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Add policies to each namespace in the cluster which has user workloads to restrict the admission of containers with .spec.allowPrivilegeEscalation set to true. Pod Security Policies and Assignments can be found by searching for Policies in the Azure Portal. A detailed step-by-step guide can be found here: https://learn.microsoft.com/en-us/azure/governance/policy/concepts/policy-for-kubernetes

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: akspoliciespod-security
Referencia: CIS Azure Kubernetes Service (AKS) Benchmark v2.0.0 - 4.2.5 Minimize the admission of containers with allowPrivilegeEscalation

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target aks