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Create: 2022-01-31 Update: 2025-07-02 23:43:56

Чем опасен доступ к nodes/proxy в RBAC?

Именно на этот вопрос исследователи дают ответ в заметке "Node/Proxy in Kubernetes RBAC".

По итогу:
- Возможность работы с Pods на Node напрямую через Kublet API в обход Kubernetes API- Право GET позволяет читать, например, получить список Pods на Node
- Право CREATE позволяет читать, например, выполнить команду в Pods- Доступ к портам, что закрыты firewalls- Обход средств контроля безопасности, таких как Kubernetes Audit Log и Admission controlsОтдельно стоит еще посмотреть на заметку "Detecting direct access to the Kubelet". По итогу, понять какой именно пользователь обращался к node proxy в Audit log нельзя, но можно увидеть, что кто-то обращался к nodes/proxy sub-resource по записям в логе о TokenReviews и SubjectAccessReviews ресурсах от kubelet.

Заодно ребята еще проверили багу 2019 года с “Abusing Kubernetes API server proxying” и убедились что она работает до сих пор.

P.S. Также не забывайте про "*" ;)

k8s (in)security

Kubernetes API

- Право GET позволяет читать, например, получить список Pods на Node
- Право CREATE позволяет читать, например, выполнить команду в

Pods

- Доступ к портам, что закрыты

firewalls

- Обход средств контроля безопасности, таких как Kubernetes Audit Log и

Admission controls

Отдельно стоит еще посмотреть на заметку "Detecting direct access to the Kubelet". По итогу, понять какой именно пользователь обращался к node proxy в Audit log нельзя, но можно увидеть, что кто-то обращался к nodes/proxy sub-resource по записям в логе о TokenReviews и SubjectAccessReviews ресурсах от kubelet.

Заодно ребята еще проверили багу 2019 года с “Abusing Kubernetes API server proxying” и убедились что она работает до сих пор.

P.S. Также не забывайте про "*" ;)

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Чем опасен доступ к nodes/proxy в RBAC?

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