Flux2 is a tool for keeping Kubernetes clusters in sync with sources of configuration, and Flux's helm-controller is a Kubernetes operator that allows one to declaratively manage Helm chart releases. Helm controller is tightly integrated with the Helm SDK. A vulnerability found in the Helm SDK that affects flux2 v0.0.17 until v0.32.0 and helm-controller v0.0.4 until v0.23.0 allows for specific data inputs to cause high memory consumption. In some platforms, this could cause the controller to panic and stop processing reconciliations. In a shared cluster multi-tenancy environment, a tenant could create a HelmRelease that makes the controller panic, denying all other tenants from their Helm releases being reconciled. Patches are available in flux2 v0.32.0 and helm-controller v0.23.0.

Flux2 Helm Controller denial of service

Helm Controller denial of service

Уязвимость программного средства синхронизации кластеров Kubernetes с источниками конфигурации Flux и пакетного менеджера для Kubernetes Helm, связанная c некорректной зачисткой или освобождением ресурсов, позволяющая нарушителю вызвать отказ в обслуживании