cis-ocp-v170-5-2-6

Minimize admission of root containers (Manual)

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CIS Red Hat OpenShift Container Platform Benchmark v1.7.0 - Control 5.2.6

Profile Applicability

Level: 2

Description

Do not generally permit containers to be run as the root user.

Rationale

Containers may run as any Linux user. Containers which run as the root user, whilst constrained by Container Runtime security features still have an escalated likelihood of container breakout.

Ideally, all containers should run as a defined non-UID 0 user.

There should be at least one Security Context Constraint (SCC) defined which does not permit root users in a container.

If you need to run root containers, 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 with containers which run as the root user will not be permitted.

Audit Procedure

Use the following command to list all SCCs that restrict the ability to run the container as root:

oc get scc -A -o json | jq '.items[] | select(.runAsUser["type"] ==
"MustRunAsNonRoot") | .metadata.name'

Verify at least one SCC is returned.

You can perform additional validation by using the following command to list the UID range for each SCC:

for i in `oc get scc --template '{{range
.items}}{{.metadata.name}}{{"\n"}}{{end}}'`; do echo "$i"; oc describe scc $i
| grep "\sUID"; done

Verify there is at least one SCC that doesn't contain 0 in the UID range.

Remediation

None required. By default, OpenShift includes the nonroot and nonroot-v2 SCCs that restrict the ability to run as nonroot. If additional SCCs are appropriate, follow the OpenShift documentation to create custom SCCs.

Default Value

By default, the following SCCs restrict the ability to run as non-root:

"nonroot"
"nonroot-v2"

References

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts	*	*	*
v8	12.8 Establish and Maintain Dedicated Computing Resources for All Administrative Work			*
v7	4.3 Ensure the Use of Dedicated Administrative Accounts	*	*	*

MITRE ATT&CK Mappings

Techniques / Sub-techniques	Tactics	Mitigations
T1098	TA0003	M1026

Profile

Level 2 (Manual)

name	cis-ocp-v170-5.2.6
description	Minimize admission of root containers (Manual)
category	cis-openshift
version	1.7.0
author	cyberstrike-official
tags	["cis","openshift","kubernetes","redhat","policies","security-context-constraints"]
cis_id	5.2.6
cis_benchmark	CIS Red Hat OpenShift Container Platform Benchmark v1.7.0
tech_stack

name	cis-ocp-v170-5.2.6
description	Minimize admission of root containers (Manual)
category	cis-openshift
version	1.7.0
author	cyberstrike-official
tags	["cis","openshift","kubernetes","redhat","policies","security-context-constraints"]
cis_id	5.2.6
cis_benchmark	CIS Red Hat OpenShift Container Platform Benchmark v1.7.0
tech_stack