CVE-2021-25748: Improper Input Validation

May 24, 2023 (updated June 1, 2023)

A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use a newline character to bypass the sanitization of the spec.rules[].http.paths[].path field of 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/8686
groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8
nvd.nist.gov/vuln/detail/CVE-2021-25748

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