cis-ocp-v180-5.2.4

DevOps & Security

Minimize admission of containers sharing host network namespace (Manual)

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CIS Red Hat OpenShift Container Platform Benchmark v1.8.0 - Control 5.2.4

Profile Applicability

Level: 1

Description

Do not generally permit containers to be run with the hostNetwork flag set to true.

Rationale

A container running in the host's network namespace could access the local loopback device, and could access network traffic to and from other pods.

There should be at least one Security Context Constraint (SCC) defined which does not permit containers to share the host network namespace.

If you have need to run containers which require hostNetwork, this should be defined in a separate SCC and you should carefully check RBAC controls to ensure that only limited service accounts and users are given permission to access that SCC.

Impact

Pods defined with Allow Host Network: true will not be permitted unless they are run under a specific SCC.

Audit Procedure

Use the following command to list all SCCs with allowHostNetwork set to false:

oc get scc -A -o json | jq '.items[] | select(.allowHostNetwork==false) |
.metadata.name'

Verify at least one SCC is returned.

Remediation

Create an SCC that sets allowHostNetwork to false and take it into use by assigning it to applicable users and groups.

Default Value

By default, the following SCCs do not allow access to the host network:

"anyuid"
"hostmount-anyuid"
"nonroot"
"nonroot-v2"
"restricted"
"restricted-v2"

References

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.12 Segment Data Processing and Storage Based on Sensitivity		*	*
v7	14.1 Segment the Network Based on Sensitivity		*	*

MITRE ATT&CK Mappings

Techniques / Sub-techniques	Tactics	Mitigations
T1098	TA0003	M1030

Profile

Level 1 (Manual)