IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
« Kubernetes Suspicious Assignment of Controller Service Account Kubernetes User Exec into Pod »
Elastic Docs ›Elastic Security Solution [8.9] ›Detections and alerts ›Prebuilt rule reference

Kubernetes Suspicious Self-Subject Review

edit

Kubernetes Suspicious Self-Subject Review

edit

This rule detects when a service account or node attempts to enumerate their own permissions via the selfsubjectaccessreview or selfsubjectrulesreview APIs. This is highly unusual behavior for non-human identities like service accounts and nodes. An adversary may have gained access to credentials/tokens and this could be an attempt to determine what privileges they have to facilitate further movement or execution within the cluster.

Rule type: query

Rule indices:

  • logs-kubernetes.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: None (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Data Source: Kubernetes
  • Tactic: Discovery

Version: 203

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

edit

Setup

edit

The Kubernetes Fleet integration with Audit Logs enabled or similarly structured data is required to be compatible with this rule.

Rule query

edit
event.dataset : "kubernetes.audit_logs"
  and kubernetes.audit.annotations.authorization_k8s_io/decision:"allow"
  and kubernetes.audit.verb:"create"
  and kubernetes.audit.objectRef.resource:("selfsubjectaccessreviews" or "selfsubjectrulesreviews")
  and (kubernetes.audit.user.username:(system\:serviceaccount\:* or system\:node\:*)
  or kubernetes.audit.impersonatedUser.username:(system\:serviceaccount\:* or system\:node\:*))

Framework: MITRE ATT&CKTM

« Kubernetes Suspicious Assignment of Controller Service Account Kubernetes User Exec into Pod »