HackingKubernetes

curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
install minikube-linux-amd64 /usr/local/bin/minikube
swapoff -a
minikube start --driver=none

Install kubectl

# https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl

Create containers

Privileged container

kubectl apply -f - <<EOF
apiVersion: v1
kind: Pod
metadata:
  name: priv-pod
spec:
  containers:
  - name: sec-ctx-8
    image: gcr.io/google-samples/node-hello:1.0
    securityContext:
      allowPrivilegeEscalation: true
      privileged: true
      readOnlyRootFilesystem: true
      runAsNonRoot: true
      runAsUser: 1000
      capabilities:
        add: ["NET_ADMIN", "SYS_TIME"]
EOF

Container with environment variables passwords

kubectl apply -f - <<EOF
apiVersion: v1
kind: Pod
metadata:
  name: envvars-db
  namespace: default
spec:
  containers:
  - name: envvars-multiple-secrets
    image: nginx
    env:
    - name: DB_PASSWORD
      valueFrom:
        secretKeyRef:
          key: db-username-key
          name: db-username
    - name: DB_USERNAME
      valueFrom:
        secretKeyRef:
          key: db-password-key
          name: db-password
EOF

kubectl apply -f - <<EOF

apiVersion: v1
kind: Namespace
metadata:
  creationTimestamp: null
  name: mars
---

apiVersion: v1
kind: ServiceAccount
metadata:
  namespace: mars
  name: user1
  
---

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: kube-system
  name: list-secrets
rules:
- apiGroups: ["*"]
  resources: ["secrets"]
  verbs: ["get", "list"]
  
---

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  namespace: kube-system
  name: list-secrets-binding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: list-secrets
subjects:
  - kind: ServiceAccount
    name: user1
    namespace: mars
    
---

apiVersion: v1
kind: Pod
metadata:
  name: alpine-secret
  namespace: mars
spec:
  containers:
  - name: alpine-secret
    image: alpine
    command: ["/bin/sh"]
    args: ["-c", "sleep 100000"]
  serviceAccountName: user1
  automountServiceAccountToken: true
  hostNetwork: true
---

apiVersion: v1
kind: Secret
metadata:
  name: db-username
data:
  db-username-key: YWRtaW4=

---

apiVersion: v1
kind: Secret
metadata:
  name: db-password
data:
  db-password-key: MTIzNDU=

EOF

Get ServiceAccount token by name

kubectl get secrets $(kubectl get sa <SERVICE_ACCOUNT_NAME> -o json | jq -r '.secrets[].name') -o json | jq -r '.data.token' | base64 -d

Function:

alias k=kubectl
function getSecretByName {
k get secrets $(k get sa $1 -o json | jq -r '.secrets[].name') -o json | jq -r '.data.token' | base64 -d
}

getSecretByName <serviceAccountName>

*Replace <SERVICE_ACCOUNT_NAME> with the name

Delete multiple containers

// delete by match with grep
kubectl delete po $(kubectl get pods -o go-template -n <NAMESPACE> --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | grep <SEARCH_STRING) -n <NAMESPACE>

// delete specific pods
kubectl delete pods -n <NAMESPACE> $(echo -e 'alpine1\nalpine2\nalpine3')

Get docker container IPs

docker inspect --format='{{.Name}}' $(docker ps -aq -f label=kubelabel)
docker inspect --format='{{ .NetworkSettings.IPAddress }}' $(docker ps -aq -f label=kubelabel)

cloudnative-security/hacking-kubernetes

HackingKubernetes

Offensive

Atricles

kubelet

Containers and Pods

PDF

Videos

Vulnerabilities

2020

2019

Kubectl vulnerability (CVE-2019-1002101)

Kubernetes API server vulnerability (CVE-2019-11247)

Kubernetes billion laughs attack vulnerability (CVE-2019-11253)

2018

Tools

Defensive

Others

Install minikube

Install kubectl

Create containers

Privileged container

Container with environment variables passwords

Get ServiceAccount token by name

Delete multiple containers

Get docker container IPs