CVE-2022-3294: Node address isn't always verified when proxying
First published: Wed Mar 01 2023(Updated: )
Users may have access to secure endpoints in the control plane network. Kubernetes clusters are only affected if an untrusted user can modify Node objects and send proxy requests to them. Kubernetes supports node proxying, which allows clients of kube-apiserver to access endpoints of a Kubelet to establish connections to Pods, retrieve container logs, and more. While Kubernetes already validates the proxying address for Nodes, a bug in kube-apiserver made it possible to bypass this validation. Bypassing this validation could allow authenticated requests destined for Nodes to to the API server's private network.
Credit: jordan@liggitt.net jordan@liggitt.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| go/github.com/kubernetes/kubernetes | >=1.22.0<1.22.16 | 1.22.16 |
| go/github.com/kubernetes/kubernetes | >=1.23.0<1.23.14 | 1.23.14 |
| go/github.com/kubernetes/kubernetes | >=1.24.0<1.24.8 | 1.24.8 |
| go/github.com/kubernetes/kubernetes | >=1.25.0<1.25.4 | 1.25.4 |
| Kubernetes Kubernetes | <1.22.16 | |
| Kubernetes Kubernetes | >=1.23.0<1.23.14 | |
| Kubernetes Kubernetes | >=1.24.0<1.24.8 | |
| Kubernetes Kubernetes | >=1.25.0<1.25.4 |
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Reference Links
Frequently Asked Questions
What is CVE-2022-3294?
CVE-2022-3294 is a vulnerability that allows users to have access to secure endpoints in the control plane network of Kubernetes clusters.
How does CVE-2022-3294 affect Kubernetes clusters?
Kubernetes clusters are only affected if an untrusted user can modify Node objects and send proxy requests to them.
How can I fix CVE-2022-3294?
To fix CVE-2022-3294, update Kubernetes to version 1.22.16, 1.23.14, 1.24.8, or 1.25.4.
What is the severity of CVE-2022-3294?
CVE-2022-3294 has a severity rating of 8.8 (High).
Where can I find more information about CVE-2022-3294?
You can find more information about CVE-2022-3294 at the following references: [NVD](https://nvd.nist.gov/vuln/detail/CVE-2022-3294), [GitHub](https://github.com/kubernetes/kubernetes/issues/113757), [Google Groups](https://groups.google.com/g/kubernetes-security-announce/c/VyPOxF7CIbA)
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