Kubernetes Pod Created With HostNetwork

Last updated 3 months ago on 2025-01-15

Created 3 years ago on 2022-07-05

About

This rules detects an attempt to create or modify a pod attached to the host network. HostNetwork allows a pod to use the node network namespace. Doing so gives the pod access to any service running on localhost of the host. An attacker could use this access to snoop on network activity of other pods on the same node or bypass restrictive network policies applied to its given namespace.

Tags

Data Source: KubernetesTactic: ExecutionTactic: Privilege EscalationLanguage: kuery

Severity

medium

Risk Score

MITRE ATT&CK™

Privilege Escalation (TA0004)(opens in a new tab or window)

↳ Escape to Host (T1611)(opens in a new tab or window)

Execution (TA0002)(opens in a new tab or window)

↳ Deploy Container (T1610)(opens in a new tab or window)

False Positive Examples

An administrator or developer may want to use a pod that runs as root and shares the hosts IPC, Network, and PID namespaces for debugging purposes. If something is going wrong in the cluster and there is no easy way to SSH onto the host nodes directly, a privileged pod of this nature can be useful for viewing things like iptable rules and network namespaces from the host's perspective. Add exceptions for trusted container images using the query field "kubernetes.audit.requestObject.spec.container.image"

License

Elastic License v2(opens in a new tab or window)

Definition

Rule Type: Query (Kibana Query Language)
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: logs-kubernetes.*
Related Integrations: kubernetes(opens in a new tab or window)
Query

event.dataset : "kubernetes.audit_logs"
  and kubernetes.audit.annotations.authorization_k8s_io/decision:"allow"
  and kubernetes.audit.objectRef.resource:"pods"
  and kubernetes.audit.verb:("create" or "update" or "patch")
  and kubernetes.audit.requestObject.spec.hostNetwork:true
  and not kubernetes.audit.requestObject.spec.containers.image: ("docker.elastic.co/beats/elastic-agent:8.4.0")

Install detection rules in Elastic Security

Detect Kubernetes Pod Created With HostNetwork in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).