IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

« Kubernetes Denied Service Account Request Kubernetes User Exec into Pod »

› ›

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: 202

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

edit

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&CK^TM

Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
Technique:
- Name: Container and Resource Discovery
- ID: T1613
- Reference URL: https://attack.mitre.org/techniques/T1613/

« Kubernetes Denied Service Account Request Kubernetes User Exec into Pod »