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Kubernetes Pod Created With HostNetwork

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Kubernetes Pod Created With HostNetwork

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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.

Rule type: query

Rule indices:

logs-kubernetes.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Elastic
Kubernetes
Continuous Monitoring
Execution
Privilege Escalation

Version: 200 (version history)

Added (Elastic Stack release): 8.4.0

Last modified (Elastic Stack release): 8.6.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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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"

Investigation guide

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Rule query

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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")

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Escape to Host
- ID: T1611
- Reference URL: https://attack.mitre.org/techniques/T1611/
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Deploy Container
- ID: T1610
- Reference URL: https://attack.mitre.org/techniques/T1610/

Rule version history

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Version 200 (8.6.0 release)

Updated query, changed from:

kubernetes.audit.objectRef.resource:"pods" and
kubernetes.audit.verb:("create" or "update" or "patch") and
kubernetes.audit.requestObject.spec.hostNetwork:true

Version 100 (8.5.0 release)

Formatting only

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