Description

Kyverno is a policy engine designed for cloud native platform engineering teams. Versions prior to 1.16.3 and 1.15.3 have a critical authorization boundary bypass in namespaced Kyverno Policy apiCall. The resolved `urlPath` is executed using the Kyverno admission controller ServiceAccount, with no enforcement that the request is limited to the policy’s namespace. As a result, any authenticated user with permission to create a namespaced Policy can cause Kyverno to perform Kubernetes API requests using Kyverno’s admission controller identity, targeting any API path allowed by that ServiceAccount’s RBAC. This breaks namespace isolation by enabling cross-namespace reads (for example, ConfigMaps and, where permitted, Secrets) and allows cluster-scoped or cross-namespace writes (for example, creating ClusterPolicies) by controlling the urlPath through context variable substitution. Versions 1.16.3 and 1.15.3 contain a patch for the vulnerability.

Weaknesses 2

Affected Products 2

References 3

• github.com https://github.com/kyverno/kyverno/commit/e0ba4de4f1e0ca325066d5095db51aec45b1407b
  Patch
• github.com https://github.com/kyverno/kyverno/commit/eba60fa856c781bcb9c3be066061a3df03ae4e3e
  Patch
• github.com https://github.com/kyverno/kyverno/security/advisories/GHSA-8p9x-46gm-qfx2
  ExploitMitigationVendor Advisory

Remediation

• github.com https://github.com/kyverno/kyverno/commit/e0ba4de4f1e0ca325066d5095db51aec45b1407b
  Patch
• github.com https://github.com/kyverno/kyverno/commit/eba60fa856c781bcb9c3be066061a3df03ae4e3e
  Patch