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

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Kubernetes Suspicious Self-Subject Review

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Kubernetes Suspicious Self-Subject Review

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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:

Elastic
Kubernetes
Continuous Monitoring
Discovery

Version: 2

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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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/

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