CVE-2023-5043: Ingress nginx annotation injection causes arbitrary command execution
First published: Wed Oct 25 2023(Updated: )
### 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 security@kubernetes.io ### Additional Details See ingress-nginx Issue [#10571](https://github.com/kubernetes/ingress-nginx/issues/10571) for more details. ### Acknowledgements This vulnerability was reported by suanve Thank You, CJ Cullen on behalf of the Kubernetes Security Response Committee
Credit: jordan@liggitt.net jordan@liggitt.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Kubernetes ingress-nginx | <1.9.0 | |
| go/k8s.io/ingress-nginx | <1.9.0 | 1.9.0 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2023/10/25/4
- https://github.com/kubernetes/ingress-nginx/issues/10571
- https://groups.google.com/g/kubernetes-security-announce/c/pVsXsOpxYZo
- https://nvd.nist.gov/vuln/detail/CVE-2023-5043
- https://github.com/advisories/GHSA-5wj4-wffq-3378 (Advisory)
- https://security.netapp.com/advisory/ntap-20240307-0012/
Frequently Asked Questions
What is CVE-2023-5043?
CVE-2023-5043 is a vulnerability in Kubernetes Ingress nginx that allows for arbitrary command execution through annotation injection.
How severe is CVE-2023-5043?
CVE-2023-5043 has a severity rating of 8.8 (high).
Which version of Kubernetes Ingress nginx is affected by CVE-2023-5043?
Kubernetes Ingress nginx version up to and exclusive of 1.9.0 is affected by CVE-2023-5043.
How can I fix CVE-2023-5043?
To fix CVE-2023-5043, update Kubernetes Ingress nginx to a version higher than 1.9.0.
Where can I find more information about CVE-2023-5043?
You can find more information about CVE-2023-5043 at the following references: [link1], [link2], [link3].
- collector/oss-sec
- alias/CVE-2023-5043
- collector/github-advisory-latest
- alias/GHSA-5wj4-wffq-3378
- collector/nvd-cve
- collector/github-advisory
- agent/author
- agent/type
- agent/first-publish-date
- agent/last-modified-date
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/weakness
- agent/title
- agent/references
- agent/description
- agent/event
- agent/tags
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- package-manager/go
- vendor/kubernetes
- canonical/kubernetes ingress-nginx