cis-ocp-vm-v100-1-8

DevOps & Security

Ensure kubevirt seccomp profile file permission is set to 700 or more restrictive (Automated)

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CIS 1.8 — Ensure kubevirt seccomp profile file permission is set to 700 or more restrictive

Profile Applicability

Level 1

Description

Setting the kubevirt Secure Computing Mode (seccomp) file permissions to 700 or more restrictive limits access to security related administrative functionality to approved administrators.

Rationale

This configuration ensures that only authorized users have access to modify the seccomp profile, thereby preventing unauthorized alterations to the allowed system calls for virt-launcher pods. By enforcing stringent permission controls, potential security risks associated with unrestricted access to sensitive system calls can be mitigated.

Impact

None.

Audit Procedure

Verify seccomp file permissions for the virt-launcher pod, run the following command:

$ for pod in $(oc get pod -n openshift-cnv -l kubevirt.io=virt-handler --no-headers -o custom-columns=":metadata.name");do
  oc exec -ti -n openshift-cnv $pod -c virt-handler -- stat -c %a /proc/1/root/var/lib/kubelet/seccomp/kubevirt/kubevirt.json
done

Should return 700 or if the file doesn't exist then the corresponding feature gate is not enabled and this check can be safely ignored.

Remediation

Update the permissions on each node using chmod:

$ oc exec <virt-handler-pod> -ti -n openshift-cnv -- chmod 700 /proc/1/root/var/lib/kubelet/seccomp/kubevirt/kubevirt.json

Default Value

If the Secure Computing Mode feature is enabled, the permissions of this file are 700 by default.

References

CIS Redhat OpenShift Virtual Machine Extension Benchmark v1.0.0, Section 1.8

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.3 Configure Data Access Control Lists	Y	Y	Y
v7	14.6 Protect Information through Access Control Lists	Y	Y	Y

MITRE ATT&CK Mappings

Tactic	Technique
Privilege Escalation	T1068 Exploitation for Privilege Escalation
Defense Evasion	T1222 File and Directory Permissions Modification

Profile

Level 1 - OpenShift Virtualization