A security issue was identified in ingress-nginx where the nginx.ingress.kubernetes.io/permanent-redirect annotation on an Ingress object (in the networking.k8s.io or extensions API group) can be used to inject arbitrary commands, and obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-5044
• kubernetes/ingress-nginx#10572
• https://groups.google.com/g/kubernetes-security-announce/c/ukuYYvRNel0
• http://www.openwall.com/lists/oss-security/2023/10/25/3
• https://security.netapp.com/advisory/ntap-20240307-0012