CVE-2021-25746: Improper Input Validation

May 6, 2022 (updated December 2, 2022)

A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use .metadata.annotations in an Ingress object (in the networking.k8s.io or extensions API group) to obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster.

References

github.com/kubernetes/ingress-nginx/issues/8503
groups.google.com/g/kubernetes-security-announce/c/hv2-SfdqcfQ
nvd.nist.gov/vuln/detail/CVE-2021-25746

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