GHSA-4g2f-xcph-2335 ingress-nginx has Improper Check for Unusual or Exceptional Conditions

• Go k8s.io/ingress-nginx: < 1.13.7 → fixed in 1.13.7 • Go k8s.io/ingress-nginx: >= 1.14.0, < 1.14.3 → fixed in 1.14.3

A security issue was discovered in ingress-nginx where the protection afforded by the `auth-url` Ingress annotation may not be effective in the presence of a specific misconfiguration. If the ingress-nginx controller is configured with a default custom-errors configuration that includes HTTP errors 401 or 403, and if the configured default custom-errors backend is defective and fails to respect the X-Code HTTP header, then an Ingress with the `auth-url` annotation may be accessed even when authentication fails. Note that the built-in custom-errors backend works correctly. Triggering this issue requires an administrator to specifically configure ingress-nginx with a broken external component.