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# Brecha crítica  de seguridad,  usada en miles de entornos, es revelada en nginx-ingress [CVE-2023-5043: annotation injection causes arbitrary command execution]
- URL: https://www.sredevops.org/es/brecha-critica-de-seguridad-usada-en-miles-de-entornos-es-revelada-en-nginx-ingress-cve-2023-5043-annotation-injection-causes-arbitrary-command-execution/
- Published: 2023-10-25T20:51:59.000Z
- Updated: 2026-01-08T02:36:19.000Z
- Author: Nicolás Georger
- Tags: Español, #home, #es, Security, DevSecOps, Kubernetes

Si utilizas nginx como ingress controller y mantienes configuraciones via annottations, debes revisar esta alerta publicada en [Kubernetess "Official" Google Group:](https://groups.google.com/g/kubernetes-announce/c/n5o0uQwykaw?ref=sredevops.org), hoy 25 de Octubre 2023:

> ## Issue Details
> 
> A security issue was identified in ingress-nginx where the nginx.ingress.kubernetes.io/configuration-snippet 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.
> 
> \*\*This issue has been rated High \*\*(CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L), and assigned CVE-2023-5043.
> 
> ## Affected Components and Configurations
> 
> This bug affects ingress-nginx. If you do not have ingress-nginx installed on your cluster, you are not affected. You can check this by running `kubectl get po -n ingress-nginx`.
> 
> If you are running the “chrooted” ingress-nginx controller introduced in v1.2.0 (gcr.io/k8s-staging-ingress-nginx/controller-chroot), command execution is possible but credential extraction is not, so the High severity does not apply.
> 
> Multi-tenant environments where non-admin users have permissions to create Ingress objects are most affected by this issue.
> 
> ## Affected Versions
> 
> <v1.9.0
> 
> ## Versions allowing mitigation
> 
> v1.9.0
> 
> ## Mitigation
> 
> Ingress Administrators should set the --enable-annotation-validation flag to enforce restrictions on the contents of ingress-nginx annotation fields.
> 
> ## Detection
> 
> If you find evidence that this vulnerability has been exploited, please contact [secu...@kubernetes.io](mailto:secu...@kubernetes.io)
> 
> ## Additional Details
> 
> See ingress-nginx Issue #10571 for more details.
> 
> ## Acknowledgements
> 
> This vulnerability was reported by suanve
> 
> \*Thank You,
> 
> CJ Cullen on behalf of the Kubernetes Security Response Committee\*

Fuente:

[\[Ingress-nginx Security Advisory\] CVE-2023-5043: Ingress nginx annotation injection causes arbitrary command execution![](https://ssl.gstatic.com/images/branding/product/1x/groups_32dp.png)Google Groups![](https://lh3.googleusercontent.com/a-/ALV-UjWdDA3Er5e9jjvy_VnQzX-WFZUuFbqGiFS1L7mwV91bsXg=s40-c)](https://groups.google.com/g/kubernetes-announce/c/n5o0uQwykaw?ref=sredevops.org)