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Kubernetes API Server Proxying Request to Kubelet

Detects non-system identities using the Kubernetes nodes/proxy API to proxy requests through the API server directly to a node's Kubelet. The nodes/proxy subresource allows any principal with this RBAC permission to…

Description

Detects non-system identities using the Kubernetes nodes/proxy API to proxy requests through the API server directly to a node's Kubelet. The nodes/proxy subresource allows any principal with this RBAC permission to reach the Kubelet API on any worker node without needing direct network access or Kubelet TLS certificates. Through this proxy path, an attacker can list all pod specifications including environment variable secrets, read Kubelet configuration and PKI material, retrieve container logs, and access running pod metadata across all workloads on the target node. Monitoring and health check endpoints such as /metrics, /healthz, and /stats are excluded to reduce noise from legitimate observability tooling.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.

Log source category
event_index

Known benign triggers

  • Legitimate kubelet debugging, node troubleshooting, or security tooling that uses the node proxy outside the excluded metrics prefix may match. Baseline approved operators and automation identities.

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