ingress-nginx vulnerabilities

A security issue was discovered in ingress-nginx where a combination of Ingress annotations can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller.

A security issue was discovered in ingress-nginx where the `nginx.ingress.kubernetes.io/rewrite-target` Ingress annotation can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller.

In ingress-nginx, a user with permission to create an Ingress may use the mirror-target annotation to target an unauthenticated configuration API within the ingress-nginx controller, allowing write commands to be submitted. Corrupting data in that API causes all traffic through ingress-nginx to be dropped until an Ingress configuration change or controller restart recreates the data correctly; in principle, this write access could also redirect traffic from other Ingresses.