k8s (in)security | United States America (US)

Create: 2022-03-05 Update: 2025-07-04 12:49:38

В статье "Privilege Escalation from Node/Proxy Rights in Kubernetes RBAC" авторы разбирают на части права Node/Proxy.

Node proxy позволяет получить доступ к workload через API server, что может быть полезно для troubleshooting и monitoring этого самого workload без предоставления к нему прямого сетевого доступа. По идеи этот доступ ограничен адресом Pod и service IP, но на деле это не так и можно обойти и обратиться к произвольному внешнему адресу. Также пользователи с правами node/proxy могут обратиться к службе, запущенной на Node, а именно Kubelet API и делать/выполнять все что она может, включая выполнение команд внутри Pods! А можно вообще не запариваться с такой замысловатой схемой и с этими права на прямую (в обход API server) обратиться к Kubelet API! И это означает обход Audit Log и Kubernetes admission controls (те же Policy Engines)!

Как итог, контролируйте свой RBAC!

P.S. Уже дописав эту заметку, я понял, что этот момент я недавно освещал, но на базе другой заметки, немного под другим углом.

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