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cis-ocp-v170-5.2.7

DevOps & Security
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Minimize admission of containers with NET_RAW capability (Manual)

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CIS Red Hat OpenShift Container Platform Benchmark v1.7.0 - Control 5.2.7

Profile Applicability

  • Level: 1

Description

Do not generally permit containers with the potentially dangerous NET_RAW capability.

Rationale

Containers run with a default set of capabilities as assigned by the Container Runtime. By default this can include potentially dangerous capabilities. With Docker as the container runtime the NET_RAW capability is enabled which may be misused by malicious containers.

Ideally, all containers should drop this capability.

There should be at least one Security Context Constraint (SCC) defined which prevents containers with the NET_RAW capability from launching.

If you need to run containers with this capability, 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 with the NET_RAW capability will not be permitted.

Audit Procedure

Use the following command to list all SCCs that drop all capabilities:

oc get scc -A -o json | jq '.items[] |
select(.requiredDropCapabilities[]?|any(. == "ALL"; .)) | .metadata.name'

Verify at least one SCC is returned.

Remediation

Create an SCC that sets requiredDropCapabilities to include ALL or at least NET_RAW and take it into use by assigning it to applicable users and groups.

Default Value

By default, the following SCCs drop all capabilities:

"hostnetwork-v2"
"nonroot-v2"
"restricted-v2"

References

  1. https://docs.openshift.com/container-platform/latest/authentication/managing-security-context-constraints.html
  2. https://kubernetes.io/docs/concepts/policy/pod-security-policy/#enabling-pod-security-policies
  3. https://www.nccgroup.trust/uk/our-research/abusing-privileged-and-unprivileged-linux-containers/

CIS Controls

Controls VersionControlIG 1IG 2IG 3
v84.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software**
v75.2 Maintain Secure Images**

MITRE ATT&CK Mappings

Techniques / Sub-techniquesTacticsMitigations
T1068TA0004M1050

Profile

Level 1 (Manual)