Description (CNA)
Capsule is a multi-tenancy and policy-based framework for Kubernetes. The Capsule Controller runs with cluster-admin privileges. Although the TenantResource RawItems processing logic forcibly sets the namespace, this is ineffective for cluster-scoped resources. Prior to version 0.13.0, tenant administrators can leverage the Controller's elevated privileges to create cluster-scoped resources (such as ClusterRole and ValidatingWebhookConfiguration) that they cannot create directly, achieving cross-tenant privilege escalation and cluster-level attacks. The attack vector has a few limiting factors. This attack requires Tenant Owner privileges and requires Capsule Controller running with cluster-admin privileges (default configuration). Additionally, some clusters may have additional admission controllers blocking malicious resources. Version 0.13.0 patches this issue.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| projectcapsule / capsule | affected < 0.13.0 |
CWE
CWE-20, CWE-863
References
- https://github.com/projectcapsule/capsule/security/advisories/GHSA-qjjm-7j9w-pw72
- https://github.com/projectcapsule/capsule/releases/tag/v0.13.0
ADP enrichment
No English description supplied.