[Security Advisory] CVE-2024-3744: azure-file-csi-driver discloses service account tokens in logs

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Rita Zhang

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May 8, 2024, 12:04:04 PMMay 8
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Hello Kubernetes Community,


A security issue was discovered in azure-file-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access cloud resources.  Tokens are only logged when TokenRequests is configured in the CSIDriver object and the driver is set to run at log level 2 or greater via the -v flag.


This issue has been rated **MEDIUM** CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N (6.5), and assigned **CVE-2024-3744**


Am I vulnerable?


You may be vulnerable if TokenRequests is configured in the CSIDriver object and the driver is set to run at log level 2 or greater via the -v flag and you are using workload identity federation.


To check if token requests are configured, run the following command:


kubectl get csidriver file.csi.azure.com -o jsonpath="{.spec.tokenRequests}"


To check if tokens are being logged, examine the secrets-store container log:


kubectl logs csi-azurefile-controller-56bfddd689-dh5tk -c azurefile -f | grep --line-buffered "csi.storage.k8s.io/serviceAccount.tokens"


Affected Versions


- azure-file-csi-driver <= v1.29.3

- azure-file-csi-driver v1.30.0


How do I mitigate this vulnerability?


Prior to upgrading, this vulnerability can be mitigated by running azure-file-csi-driver at log level 0 or 1 via the -v flag.


Fixed Versions


- azure-file-csi-driver v1.29.4

- azure-file-csi-driver v1.30.1


To upgrade, refer to the documentation: https://github.com/kubernetes-sigs/azurefile-csi-driver?tab=readme-ov-file#install-driver-on-a-kubernetes-cluster 


Detection


Examine cloud provider logs for unexpected token exchanges, as well as unexpected access to cloud resources.


If you find evidence that this vulnerability has been exploited, please contact secu...@kubernetes.io


Acknowledgements


This vulnerability was patched by Weizhi Chen @cvvz from Microsoft.


Thank You,

Rita Zhang on behalf of the Kubernetes Security Response Committee


Rita Zhang

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May 14, 2024, 5:18:03 PMMay 14
to kubernetes-announce, dev, kubernetes-sec...@googlegroups.com, kubernetes-security-discuss, distributo...@kubernetes.io
See the GitHub issue for more details: https://github.com/kubernetes/kubernetes/issues/124759

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