sigmalowHunting

RBAC Permission Enumeration Attempt

Detects identities attempting to enumerate their Kubernetes RBAC permissions. In the early stages of a breach, attackers will aim to list the permissions they have within the compromised environment. In a Kubernetes cluster, this can be achieved by interacting with the API server, and querying the SelfSubjectAccessReview API via e.g. a "kubectl auth can-i --list" command. This will enumerate the Role-Based Access Controls (RBAC) rules defining the compromised user's authorization.

MITRE ATT&CK

T1069.003 T1087.004

discovery

Detection Query

selection:
  verb: create
  apiGroup: authorization.k8s.io
  objectRef.resource: selfsubjectrulesreviews
condition: selection

Author

Leo Tsaousis (@laripping)

Created

2024-03-26

Data Sources

kubernetesauditapplication

Platforms

kubernetes

References

https://www.elastic.co/guide/en/security/current/kubernetes-suspicious-self-subject-review.html

Tags

attack.t1069.003attack.t1087.004attack.discovery

Raw Content

title: RBAC Permission Enumeration Attempt
id: 84b777bd-c946-4d17-aa2e-c39f5a454325
status: test
description: |
    Detects identities attempting to enumerate their Kubernetes RBAC permissions.
    In the early stages of a breach, attackers will aim to list the permissions they have within the compromised environment.
    In a Kubernetes cluster, this can be achieved by interacting with the API server, and querying the SelfSubjectAccessReview API via e.g. a "kubectl auth can-i --list" command.
    This will enumerate the Role-Based Access Controls (RBAC) rules defining the compromised user's authorization.
references:
    - https://www.elastic.co/guide/en/security/current/kubernetes-suspicious-self-subject-review.html
author: Leo Tsaousis (@laripping)
date: 2024-03-26
tags:
    - attack.t1069.003
    - attack.t1087.004
    - attack.discovery
logsource:
    category: application
    product: kubernetes
    service: audit
detection:
    selection:
        verb: 'create'
        apiGroup: 'authorization.k8s.io'
        objectRef.resource: 'selfsubjectrulesreviews'
    condition: selection
falsepositives:
    - Unknown
level: low