Minimize the admission of containers with allowPrivilegeEscalation

高レベル 1自動aks

説明

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.

チェック方法

監査方法: シェルコマンド

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

期待される出力: compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

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

プロパティ

オペレーティングシステム: すべて
タグ: akspoliciespod-security
参照: CIS Azure Kubernetes Service (AKS) Benchmark v2.0.0 - 4.2.5 Minimize the admission of containers with allowPrivilegeEscalation

このホストをチェック

監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

shell

tmaegis scan --target aks