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…

PriorityP338medium6.5CVSS 3.1

AVNACLPRLUINSUCNIHAN

EPSS

0.50%

38.8th percentile

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
github.com	kyverno_kyverno	>= 0 < 1.10.0	1.10.0
kyverno	kyverno	< 1.10.0	1.10.0
nirmata	kyverno	< 1.10.0	1.10.0

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