要点
- CVE-2024-48921 は github.com/kyverno/kyverno, kyverno (nirmata) に影響する深刻度「低」 (CVSS 2.7) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.57%（全脆弱性の 47.3% より高い）。
- 対処：1.13.0 以降に更新してください。
概要
Summary
A kyverno ClusterPolicy, ie. "disallow-privileged-containers," can be overridden by the creation of a PolicyException in a random namespace.
Details
By design, PolicyExceptions are consumed from any namespace. Administrators may not recognize that this allows users with privileges to non-kyverno namespaces to create exceptions.
PoC
- Administrator creates "disallow-privileged-containers" ClusterPolicy that applies to resources in the namespace "ubuntu-restricted"
- Cluster user creates a PolicyException object for "disallow-privileged-containers" in namespace "ubuntu-restricted"
- Cluster user creates a pod with a privileged container in "ubuntu-restricted"
- Cluster user escalates to root on the node from the privileged container
Impact
Administrators attempting to enforce cluster security through kyverno policies, but that allow less privileged users to create resources
NVD の説明
Kyverno is a policy engine designed for Kubernetes. A kyverno ClusterPolicy, ie. "disallow-privileged-containers," can be overridden by the creation of a PolicyException in a random namespace. By design, PolicyExceptions are consumed from any namespace. Administrators may not recognize that this allows users with privileges to non-kyverno namespaces to create exceptions. This vulnerability is fixed in 1.13.0.
github.com/kyverno/kyverno のその他の脆弱性
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