CVE-2022-24878
Improper path handling in Kustomization files allows for denial of service
Impact
The kustomize-controller enables the use of Kustomize’s functionality when applying Kubernetes declarative state onto a cluster. A malicious user can use a specially crafted `kustomization.yaml` to cause Denial of Service at controller level. In multi-tenancy deployments this can lead to multiple tenants not being able to apply their Kustomizations until the malicious `kustomization.yaml` is removed and the controller restarted. ### Impact Within the affected versions, users with write access to a Flux source are able to craft a malicious `kustomization.yaml` file which causes the controller to enter an endless loop. ### Patches This vulnerability was fixed in kustomize-controller v0.24.0 and included in flux2 v0.29.0 released on 2022-04-20. The changes introduce better handling of Kustomization files blocking references that could lead to endless loops. ### Credits The Flux engineering team found and patched this vulnerability. ### For more information If you have any questions or comments about this advisory please open an issue in the [flux2 repository](http://github.com/fluxcd/flux2).
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/fluxcd/kustomize-controller | >= 0.16.0, < 0.24.0 | 0.24.0 |
| go | github.com/fluxcd/flux2 | >= 0.19.0, < 0.29.0 | 0.29.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Fluxcd | Flux2 | before 0.29.0 |
| Fluxcd | Kustomize-Controller | before 0.24.0 |