Kubernetes secrets-store-csi-driver in versions before 1.3.3 discloses service account tokens in logs.

A security issue was discovered in [secrets-store-csi-driver](https://github.com/kubernetes-sigs/secrets-store-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 secrets stored in cloud vault solutions. Tokens are only logged when [TokenRequests is configured in the CSIDriver object](https://kubernetes-csi.github.io/docs/token-requests.html) 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](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N) (6.5), and assigned **CVE-2023-2878**

**Am I vulnerable?**

You may be vulnerable if [TokenRequests is configured in the CSIDriver object](https://kubernetes-csi.github.io/docs/token-requests.html) and the driver is set to run at log level 2 or greater via the -v flag.

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

```shell
kubectl get csidriver secrets-store.csi.k8s.io -o jsonpath="{.spec.tokenRequests}"
```

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

```shell
kubectl logs -l app=secrets-store-csi-driver -c secrets-store -f | grep --line-buffered "csi.storage.k8s.io/serviceAccount.tokens"
```

**Affected Versions**

- secrets-store-csi-driver < 1.3.3

**How do I mitigate this vulnerability?**

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

**Fixed Versions**

- secrets-store-csi-driver >= 1.3.3

To upgrade, refer to the documentation: [https://secrets-store-csi-driver.sigs.k8s.io/getting-started/upgrades.html#upgrades](https://secrets-store-csi-driver.sigs.k8s.io/getting-started/upgrades.html#upgrades)

**Detection**

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

If you find evidence that this vulnerability has been exploited, please contact [security@kubernetes.io](mailto:security@kubernetes.io)

**Acknowledgements**

This vulnerability was reported by Tomer Shaiman `@tshaiman` from Microsoft.

/area security
/kind bug
/committee security-response
/label official-cve-feed
/sig auth
CVE-2023-2878: secrets-store-csi-driver discloses service account tokens in logs
This is a GitHub Issue
repo:kubernetes
owner:kubernetes
Title : CVE-2023-2878: secrets-store-csi-driver discloses service account tokens in logs
Issue date:

--- start body ---
A security issue was discovered in [secrets-store-csi-driver](https://github.com/kubernetes-sigs/secrets-store-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 secrets stored in cloud vault solutions. Tokens are only logged when [TokenRequests is configured in the CSIDriver object](https://kubernetes-csi.github.io/docs/token-requests.html) 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](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N) (6.5), and assigned **CVE-2023-2878**

**Am I vulnerable?**

You may be vulnerable if [TokenRequests is configured in the CSIDriver object](https://kubernetes-csi.github.io/docs/token-requests.html) and the driver is set to run at log level 2 or greater via the -v flag.

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

```shell
kubectl get csidriver secrets-store.csi.k8s.io -o jsonpath="{.spec.tokenRequests}"
```

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

```shell
kubectl logs -l app=secrets-store-csi-driver -c secrets-store -f | grep --line-buffered "csi.storage.k8s.io/serviceAccount.tokens"
```

**Affected Versions**

- secrets-store-csi-driver < 1.3.3

**How do I mitigate this vulnerability?**

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

**Fixed Versions**

- secrets-store-csi-driver >= 1.3.3

To upgrade, refer to the documentation: [https://secrets-store-csi-driver.sigs.k8s.io/getting-started/upgrades.html#upgrades](https://secrets-store-csi-driver.sigs.k8s.io/getting-started/upgrades.html#upgrades)

**Detection**

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

If you find evidence that this vulnerability has been exploited, please contact [security@kubernetes.io](mailto:security@kubernetes.io)

**Acknowledgements**

This vulnerability was reported by Tomer Shaiman `@tshaiman` from Microsoft.

/area security
/kind bug
/committee security-response
/label official-cve-feed
/sig auth
--- end body ---
