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Kubewarden-Controller information leak via AdmissionPolicyGroup Resource

Moderate severity GitHub Reviewed Published Jan 30, 2025 in kubewarden/kubewarden-controller • Updated Jan 30, 2025

Package

gomod github.com/kubewarden/kubewarden-controller (Go)

Affected versions

>= 1.17.0, < 1.21.0

Patched versions

1.21.0

Description

Impact

The policy group feature, added to by the 1.17.0 release, introduced two new types of CRD: ClusterAdmissionPolicyGroup and AdmissionPolicyGroup. The former is cluster wide, while the latter is namespaced.

By being namespaced, the AdmissionPolicyGroup has a well constrained impact on cluster resources. Hence, it’s considered safe to allow non-admin users to create and manage these resources in the namespaces they own.
Kubewarden policies can be allowed to query the Kubernetes API at evaluation time; these types of policies are called “context aware“.
Context aware policies can perform list and get operations against a Kubernetes cluster. The queries are done using the ServiceAccount of the Policy Server instance that hosts the policy. That means that access to the cluster is determined by the RBAC rules that apply to that ServiceAccount.
The AdmissionPolicyGroup CRD allowed the deployment of context aware policies. This could allow an attacker to obtain information about resources that are out of their reach, by leveraging a higher access to the cluster granted to the ServiceAccount token used to run the policy.

The impact of this vulnerability depends on the privileges that have been granted to the ServiceAccount used to run the Policy Server and assumes that users are using the recommended best practices of keeping the Policy Server's ServiceAccount least privileged. By default, the Kubewarden helm chart grants access to the following resources (cluster wide) only: Namespace, Pod, Deployment and Ingress.

Patches

Starting from the 1.21.0 release, the AdmissionPolicyGroup CRD does not allow the definition of context aware policies. No modifications are needed neither for performing the upgrade nor afterwards.

Workarounds

On clusters running Kubewarden < 1.21.0, the following Kubewarden policy can be applied to prevent the creation of AdmissionPolicyGroup resources that have access to Kubernetes resources:

apiVersion: policies.kubewarden.io/v1
kind: ClusterAdmissionPolicy
metadata:
  name: "deny-admission-policy-groups-with-context-resources"
spec:
  module: registry://ghcr.io/kubewarden/policies/cel-policy:latest
  settings:
    variables:
      - name: hasContextAwareResources
        expression: "object.spec.policies.exists(p, has(object.spec.policies[p].contextAwareResources))"
      - name: isPendingDeletion
        expression: "has(object.metadata.deletionTimestamp)"
    validations:
      - expression: "!variables.hasContextAwareResources || variables.isPendingDeletion"
        message: "AdmissionPolicyGroup has contextAwareResources defined"
  rules:
    - apiGroups: ["policies.kubewarden.io"]
      apiVersions: ["v1"]
      operations: ["CREATE", "UPDATE"]
      resources: ["admissionpolicygroups"]
  mutating: false
  backgroundAudit: true

Once the policy is applied, the Kubewarden Audit Scanner can be used to identify the AdmissionPolicyGroup policies that are violating this policy.

For more information

If you have any questions or comments about this advisory you can contact the Kubewarden team using the procedures described under the “security disclosure“ guidelines of the Kubewarden project.

References

@flavio flavio published to kubewarden/kubewarden-controller Jan 30, 2025
Published by the National Vulnerability Database Jan 30, 2025
Published to the GitHub Advisory Database Jan 30, 2025
Reviewed Jan 30, 2025
Last updated Jan 30, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS score

CVE ID

CVE-2025-24784

GHSA ID

GHSA-756x-m4mj-q96c

Credits

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