CVE-2020-8553: Externally Controlled Reference to a Resource in Another Sphere

May 24, 2022 (updated July 13, 2023)

The Kubernetes ingress-nginx component prior to version 0.28.0 allows a user with the ability to create namespaces and to read and create ingress objects to overwrite the password file of another ingress which uses nginx.ingress.kubernetes.io/auth-type: basic and which has a hyphenated namespace or secret name.

References

github.com/advisories/GHSA-hhpm-74pm-hf35
github.com/kubernetes/ingress-nginx/issues/5126
nvd.nist.gov/vuln/detail/CVE-2020-8553

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