oss-sec mailing list archives
[kubernetes] CVE-2023-5044: Code injection via nginx.ingress.kubernetes.io/permanent-redirect annotation
From: CJ Cullen <cjcullen () google com>
Date: Wed, 25 Oct 2023 09:32:13 -0700
Issue Details A security issue was identified in ingress-nginx <https://github.com/kubernetes/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. 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 <https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L>), and assigned CVE-2023-5044. 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 security () kubernetes io Additional Details See ingress-nginx Issue #10572 <https://github.com/kubernetes/ingress-nginx/issues/10572> for more details. Acknowledgements This vulnerability was reported by Jan-Otto Kröpke (Cloudeteer GmbH) Thank You, CJ Cullen on behalf of the Kubernetes Security Response Committee
Current thread:
- [kubernetes] CVE-2023-5044: Code injection via nginx.ingress.kubernetes.io/permanent-redirect annotation CJ Cullen (Oct 25)