Kyverno up to 1.9.x deletionTimestamp improper authorization

Summaryinfo

A vulnerability described as critical has been identified in Kyverno up to 1.9.x. This affects an unknown function. Such manipulation of the argument deletionTimestamp leads to improper authorization. This vulnerability is referenced as CVE-2023-34091. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Kyverno up to 1.9.x. It has been rated as critical. Affected by this issue is an unknown code block. The manipulation of the argument deletionTimestamp with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was published 06/01/2023 as GHSA-hq4m-4948-64cc. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2023-34091 since 05/25/2023. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 1.10.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Name

• Kyverno

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9

Website

• Product: https://github.com/kyverno/kyverno/

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