CVE-2023-2431: Bypass of seccomp profile enforcement
First published: Fri Jun 16 2023(Updated: )
A security issue was discovered in Kubelet that allows pods to bypass the seccomp profile enforcement. Pods that use localhost type for seccomp profile but specify an empty profile field, are affected by this issue. In this scenario, this vulnerability allows the pod to run in unconfined (seccomp disabled) mode. This bug affects Kubelet.
Credit: jordan@liggitt.net jordan@liggitt.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Kubernetes Kubernetes | <1.24.14 | |
| Kubernetes Kubernetes | >=1.25.0<1.25.10 | |
| Kubernetes Kubernetes | >=1.26.0<1.26.5 | |
| Kubernetes Kubernetes | >=1.27.0<1.27.2 | |
| Fedoraproject Fedora | =38 | |
| go/k8s.io/kubernetes | >=1.27.0<1.27.2 | 1.27.2 |
| go/k8s.io/kubernetes | >=1.26.0<1.26.5 | 1.26.5 |
| go/k8s.io/kubernetes | >=1.25.0<1.25.10 | 1.25.10 |
| go/k8s.io/kubernetes | <1.24.14 | 1.24.14 |
Remedy
To mitigate these vulnerabilities, upgrade Kubelet: https://kubernetes.io/docs/tasks/administer-cluster/cluster-upgrade/ https://kubernetes.io/docs/tasks/administer-cluster/cluster-upgrade/
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Reference Links
- https://github.com/kubernetes/kubernetes/issues/118690
- https://groups.google.com/g/kubernetes-security-announce/c/QHmx0HOQa10
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/43HDSKBKPSW53OW647B5ETHRWFFNHSRQ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XBX4RL4UOC7JHWWYB2AJCKSUM7EG5Y5G/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2215556
- https://access.redhat.com/errata/RHSA-2023:6156
- https://bugzilla.redhat.com/show_bug.cgi?id=2215555
- https://nvd.nist.gov/vuln/detail/CVE-2023-2431
- https://github.com/kubernetes/kubernetes/pull/117020
- https://github.com/kubernetes/kubernetes/pull/117116
- https://github.com/kubernetes/kubernetes/pull/117117
- https://github.com/kubernetes/kubernetes/pull/117118
- https://github.com/kubernetes/kubernetes/pull/117147
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/43HDSKBKPSW53OW647B5ETHRWFFNHSRQ
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XBX4RL4UOC7JHWWYB2AJCKSUM7EG5Y5G
- https://pkg.go.dev/vuln/GO-2023-1864
- https://github.com/advisories/GHSA-xc8m-28vv-4pjc (Advisory)
Frequently Asked Questions
What is CVE-2023-2431?
CVE-2023-2431 is a security issue in Kubelet that allows pods to bypass the seccomp profile enforcement.
Which pods are affected by CVE-2023-2431?
Pods that use the localhost type for seccomp profile but specify an empty profile field are affected by this vulnerability.
What is the severity of CVE-2023-2431?
CVE-2023-2431 has a severity score of 5.5, which is considered medium.
How can I fix CVE-2023-2431?
To fix CVE-2023-2431, update Kubernetes to version 1.24.15, 1.25.11, 1.26.6, 1.27.3, or later.
Where can I find more information about CVE-2023-2431?
You can find more information about CVE-2023-2431 in the following references: [GitHub Issue](https://github.com/kubernetes/kubernetes/issues/118690), [Google Group](https://groups.google.com/g/kubernetes-security-announce/c/QHmx0HOQa10), [Fedora Mailing List](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/43HDSKBKPSW53OW647B5ETHRWFFNHSRQ/).
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