Bugzilla – Bug 1211943
VUL-0: CVE-2023-34091: kyverno: policy bypass during resource deletion
Last modified: 2023-06-02 07:58:21 UTC
CVE-2023-34091 Kyverno is a policy engine designed for Kubernetes. In versions of Kyverno prior to 1.10.0, resources which have the `deletionTimestamp` field defined can bypass validate, generate, or mutate-existing policies, even in cases where the `validationFailureAction` field is set to `Enforce`. This situation occurs as resources pending deletion were being consciously exempted by Kyverno, as a way to reduce processing load as policies are typically not applied to objects which are being deleted. However, this could potentially result in allowing a malicious user to leverage the Kubernetes finalizers feature by setting a finalizer which causes the Kubernetes API server to set the `deletionTimestamp` and then not completing the delete operation as a way to explicitly to bypass a Kyverno policy. Note that this is not applicable to Kubernetes Pods but, as an example, a Kubernetes Service resource can be manipulated using an indefinite finalizer to bypass policies. This is resolved in Kyverno 1.10.0. There is no known workaround. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-34091 https://www.cve.org/CVERecord?id=CVE-2023-34091 https://github.com/kyverno/kyverno/releases/tag/v1.10.0 https://github.com/kyverno/kyverno/security/advisories/GHSA-hq4m-4948-64cc
(In reply to Carlos López from comment #0) > This is resolved in Kyverno 1.10.0. We already have this in Factory, so nothing to do. Closing.