cis-ocp-vm-v100-1-12

DevOps & Security

Restrict VNC access to cluster workloads (Manual)

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CIS 1.12 — Restrict VNC access to cluster workloads

Profile Applicability

Level 1

Description

Access to each workload's virtual screen is provided via VNC. Permission to use VNC is granted via a role, which means users with role assigned can access the VNC console of all workloads in a namespace.

Rationale

Access to use VNC should be carefully considered as it is usually preferable to access workloads via other means which support a stronger encryption and authentication mechanism.

Impact

Limiting VNC access to cluster workloads means users will need to access the machine using approved communication mechanisms.

Audit Procedure

Verify to which users have the necessary permissions to create tokens:

$ oc get rolebinding -ojson | jq -c '.items[] | select(.roleRef.name | contains("token.kubevirt.io:generate"))'

Remediation

Assign this RoleBinding only to users with approval to use it, otherwise remove unapproved users.

Default Value

No default value, the command returns the list of rolebindings which has the roleName to generate the kubevirt token. If none was created then the command returns an empty list.

References

CIS Redhat OpenShift Virtual Machine Extension Benchmark v1.0.0, Section 1.12

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	4 Secure Configuration of Enterprise Assets and Software	N	N	N
v7	5.1 Establish Secure Configurations	Y	Y	Y

MITRE ATT&CK Mappings

Tactic	Technique
Lateral Movement	T1021.005 Remote Services: VNC
Initial Access	T1133 External Remote Services

Profile

Level 1 - OpenShift Virtualization