CVE-2021-25748 Information

Description

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.

Reference

https://github.com/kubernetes/ingress-nginx/issues/8686 https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8