Vulnerability Report: GO-2022-1071

• CVE-2022-39272, GHSA-f4p5-x4vc-mh4v
• Affects: github.com/fluxcd/helm-controller/api, github.com/fluxcd/image-automation-controller/api, and 4 more
• Published: Oct 28, 2022
• Modified: May 20, 2024

Flux controllers are vulnerable to a denial of service attack. Users that have permissions to change Flux's objects, either through a Flux source or directly within a cluster, can provide invalid data to fields .spec.interval or .spec.timeout (and structured variations of these fields), causing the entire object type to stop being processed. The issue has two root causes: a) the Kubernetes type metav1.Duration is not fully compatible with the Go type time.Duration as explained in https://github.com/kubernetes/apimachinery/issues/131, and b) a lack of validation within Flux to restrict allowed values.