CVE-2021-41254
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-41254
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41254.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-41254
- Aliases
- Related
- Published
- 2021-11-12T18:15:07Z
- Modified
- 2025-02-19T03:22:51.530150Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
kustomize-controller is a Kubernetes operator, specialized in running continuous delivery pipelines for infrastructure and workloads defined with Kubernetes manifests and assembled with Kustomize. Users that can create Kubernetes Secrets, Service Accounts and Flux Kustomization objects, could execute commands inside the kustomize-controller container by embedding a shell script in a Kubernetes Secret. This can be used to run
kubectlcommands under the Service Account of kustomize-controller, thus allowing an authenticated Kubernetes user to gain cluster admin privileges. In affected versions multitenant environments where non-admin users have permissions to create Flux Kustomization objects are affected by this issue. This vulnerability was fixed in kustomize-controller v0.15.0 (included in flux2 v0.18.0) released on 2021-10-08. Starting with v0.15, the kustomize-controller no longer executes shell commands on the container OS and thekubectlbinary has been removed from the container image. To prevent the creation of Kubernetes Service Accounts withsecretsin namespaces owned by tenants, a Kubernetes validation webhook such as Gatekeeper OPA or Kyverno can be used. - References
Affected packages
Git / github.com/fluxcd/flux2
Affected ranges
- Type
- GIT
- Repo
- https://github.com/fluxcd/flux2
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Type
- GIT
- Repo
- https://github.com/fluxcd/kustomize-controller
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed