Kubernetes Anonymous Request Authorizededit
This rule detects when an unauthenticated user request is authorized within the cluster. Attackers may attempt to use anonymous accounts to gain initial access to the cluster or to avoid attribution of their activities within the cluster. This rule excludes the /healthz, /livez and /readyz endpoints which are commonly accessed anonymously.
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: Execution
- Tactic: Initial Access
- Tactic: Defense Evasion
Version: 6
Rule authors:
- Elastic
Rule license: Elastic License v2
Investigation guideedit
Setupedit
The Kubernetes Fleet integration with Audit Logs enabled or similarly structured data is required to be compatible with this rule.
Rule queryedit
event.dataset:kubernetes.audit_logs
and kubernetes.audit.annotations.authorization_k8s_io/decision:allow
and kubernetes.audit.user.username:("system:anonymous" or "system:unauthenticated" or not *)
and not kubernetes.audit.requestURI:(/healthz* or /livez* or /readyz*)
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
-
Technique:
- Name: Valid Accounts
- ID: T1078
- Reference URL: https://attack.mitre.org/techniques/T1078/
-
Sub-technique:
- Name: Default Accounts
- ID: T1078.001
- Reference URL: https://attack.mitre.org/techniques/T1078/001/