← Policy catalog
</> ValidatingAdmissionPolicy · Apache-2.0

Has No Seccomp Profile Set

ephemeralcontainer-seccomp-profile-restricted

severityModerate resourceEphemeralContainers productKubernetes bundles2

An ephemeral container with no seccomp profile enforced at pod or ephemeral container level runs with no syscall filter, leaving the full kernel syscall surface reachable for container escape and privilege escalation.

Rejects unless

(has(object.spec.os) &&
 has(object.spec.os.name) &&
 object.spec.os.name.lowerAscii() == "windows") ||
(variables.podTypeAllowed &&
 (!has(object.spec.ephemeralContainers) ||
  object.spec.ephemeralContainers.all(ec,
    !has(ec.securityContext) ||
    !has(ec.securityContext.seccompProfile) ||
    !has(ec.securityContext.seccompProfile.type) ||
    variables.allowedSeccompTypes.exists(t, t == ec.securityContext.seccompProfile.type)
  )
 )
) || (!variables.podTypePresent &&
 (!has(object.spec.ephemeralContainers) ||
  object.spec.ephemeralContainers.all(ec,
    has(ec.securityContext) &&
    has(ec.securityContext.seccompProfile) &&
    has(ec.securityContext.seccompProfile.type) &&
    variables.allowedSeccompTypes.exists(t, t == ec.securityContext.seccompProfile.type)
  )
 )
)

spec.ephemeralContainers[*].securityContext.seccompProfile.type must be "RuntimeDefault" or "Localhost". Ephemeral container fields may be undefined only when the Pod-level spec.securityContext.seccompProfile.type is set to "RuntimeDefault" or "Localhost"; otherwise every ephemeral container must set its own to one of those values.

Variables

allowedSeccompTypes

["RuntimeDefault","Localhost"]

podTypePresent

has(object.spec.securityContext) && has(object.spec.securityContext.seccompProfile) && has(object.spec.securityContext.seccompProfile.type)

podTypeAllowed

variables.podTypePresent && variables.allowedSeccompTypes.exists(t, t == object.spec.securityContext.seccompProfile.type)

Remediation

Set the seccomp type to RuntimeDefault, or to Localhost naming a profile loaded on the node, on each ephemeral container or once at pod level. Fields: spec.ephemeralContainers[*].securityContext.seccompProfile.type, spec.securityContext.seccompProfile.type.

Applies to

  • pods · v1 · CREATE, UPDATE
  • pods/ephemeralcontainers · v1 · CREATE, UPDATE

Manifest

apiVersion: admissionregistration.k8s.io/v1
kind: ValidatingAdmissionPolicy
metadata:
  name: ephemeralcontainer-seccomp-profile-restricted
  annotations:
    kubeapt.io/uuid: "ae109ba1-7514-400c-bf0c-8f854a867722"
    security.kubeapt.io/displayName: "Has No Seccomp Profile Set"
    security.kubeapt.io/description: "An ephemeral container with no seccomp profile enforced at pod or ephemeral container level runs with no syscall filter, leaving the full kernel syscall surface reachable for container escape and privilege escalation."
    security.kubeapt.io/resource: "EphemeralContainers"
    security.kubeapt.io/severity: "Moderate"
    security.kubeapt.io/remediation: "Set the seccomp type to RuntimeDefault, or to Localhost naming a profile loaded on the node, on each ephemeral container or once at pod level. Fields: spec.ephemeralContainers[*].securityContext.seccompProfile.type, spec.securityContext.seccompProfile.type."
    security.kubeapt.io/product: "Kubernetes"
spec:
  failurePolicy: Fail
  matchConstraints:
    resourceRules:
    - apiGroups:
      - ''
      apiVersions:
      - v1
      operations:
      - CREATE
      - UPDATE
      resources:
      - pods
    - apiGroups:
      - ''
      apiVersions:
      - v1
      operations:
      - CREATE
      - UPDATE
      resources:
      - pods/ephemeralcontainers
  variables:
  - name: allowedSeccompTypes
    expression: |
      ["RuntimeDefault","Localhost"]
  - name: podTypePresent
    expression: |
      has(object.spec.securityContext) && has(object.spec.securityContext.seccompProfile) && has(object.spec.securityContext.seccompProfile.type)
  - name: podTypeAllowed
    expression: |
      variables.podTypePresent && variables.allowedSeccompTypes.exists(t, t == object.spec.securityContext.seccompProfile.type)
  validations:
  - expression: |
      (has(object.spec.os) &&
       has(object.spec.os.name) &&
       object.spec.os.name.lowerAscii() == "windows") ||
      (variables.podTypeAllowed &&
       (!has(object.spec.ephemeralContainers) ||
        object.spec.ephemeralContainers.all(ec,
          !has(ec.securityContext) ||
          !has(ec.securityContext.seccompProfile) ||
          !has(ec.securityContext.seccompProfile.type) ||
          variables.allowedSeccompTypes.exists(t, t == ec.securityContext.seccompProfile.type)
        )
       )
      ) || (!variables.podTypePresent &&
       (!has(object.spec.ephemeralContainers) ||
        object.spec.ephemeralContainers.all(ec,
          has(ec.securityContext) &&
          has(ec.securityContext.seccompProfile) &&
          has(ec.securityContext.seccompProfile.type) &&
          variables.allowedSeccompTypes.exists(t, t == ec.securityContext.seccompProfile.type)
        )
       )
      )
    message: |
      spec.ephemeralContainers[*].securityContext.seccompProfile.type must be "RuntimeDefault" or "Localhost". Ephemeral container fields may be undefined only when the Pod-level spec.securityContext.seccompProfile.type is set to "RuntimeDefault" or "Localhost"; otherwise every ephemeral container must set its own to one of those values.

Save it as ephemeralcontainer-seccomp-profile-restricted.yaml — the commands below assume that name.

Validate with kubeapt

Check a workload against this one policy, before anything is installed on a cluster.

$ kubeapt validate -p ./ephemeralcontainer-seccomp-profile-restricted.yaml -r ./workload.yaml

Or without the file, from the published policy set — -r takes a directory too:

$ kubeapt policies download && kubeapt validate --policy-name ephemeralcontainer-seccomp-profile-restricted -r ./manifests

Or against every namespace in the cluster your kubeconfig points at:

$ kubeapt validate --policy-name ephemeralcontainer-seccomp-profile-restricted -A