CVE-2023-34091— Kyverno resource with a deletionTimestamp may allow policy circumvention

Kyverno resource with a deletionTimestamp may allow policy circumvention

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

授权机制不恰当

Kyverno 安全漏洞

Kyverno是Kyverno开源的一个为 Kubernetes 设计的策略引擎。 Kyverno 1.10.0之前版本存在安全漏洞，该漏洞源于deletionTimestamp字段的资源可以绕过验证、生成或改变现有策略。

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