Headline
CVE-2022-36049: Helm Controller denial of service
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.
Helm controller is tightly integrated with the Helm SDK. A vulnerability found in the Helm SDK allows for specific data inputs to cause high memory consumption, which in some platforms could cause the controller to panic and stop processing reconciliations.
Impact
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.
Credits
The initial crash bug was reported by oss-fuzz. The Flux Security team produced the first exploit and worked together with the Helm Security team to ensure that both projects were patched timely.
For more information
If you have any questions or comments about this advisory:
- Open an issue in any of the affected repositories.
- Contact us at the CNCF Flux Channel.
References
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=48360
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=44996
- GHSA-7hfp-qfw3-5jxh
Related news
Helm controller is tightly integrated with the Helm SDK. [A vulnerability](https://github.com/helm/helm/security/advisories/GHSA-7hfp-qfw3-5jxh) found in the Helm SDK allows for specific data inputs to cause high memory consumption, which in some platforms could cause the controller to panic and stop processing reconciliations. ### Impact 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. ### Credits The initial crash bug was reported by [oss-fuzz](https://github.com/google/oss-fuzz). The Flux Security team produced the first exploit and worked together with the Helm Security team to ensure that both projects were patched timely. ### For more information If you have any questions or comments about this advisory: - Open an issue in any of the affected repositories. - Contact us at the CNCF Flux Channel. ### References - https://bugs.chromium.org/p/...