CVE-2019-11253: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

May 18, 2021

Improper input validation in the Kubernetes API server in versions v1.0-1.12 and versions prior to v1.13.12, v1.14.8, v1.15.5, and v1.16.2 allows authorized users to send malicious YAML or JSON payloads, causing the API server to consume excessive CPU or memory, potentially crashing and becoming unavailable. Prior to v1.14.0, default RBAC policy authorized anonymous users to submit requests that could trigger this vulnerability. Clusters upgraded from a version prior to v1.14.0 keep the more permissive policy by default for backwards compatibility.

References

gist.github.com/bgeesaman/0e0349e94cd22c48bf14d8a9b7d6b8f2
github.com/advisories/GHSA-pmqp-h87c-mr78
github.com/kubernetes/kubernetes/issues/83253
github.com/kubernetes/kubernetes/pull/83261
nvd.nist.gov/vuln/detail/CVE-2019-11253

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