CVE-2023-34091
Kyverno resource with a deletionTimestamp may allow policy circumvention
Impact
### Impact 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](https://kubernetes.io/docs/concepts/overview/working-with-objects/finalizers/) 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. ### Patches This is resolved in Kyverno 1.10.0. ### Workarounds There is no known workaround. ### References _Are there any links users can visit to find out more?_
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/kyverno/kyverno | < 1.10.0 | 1.10.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Nirmata | Kyverno | before 1.10.0 |