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githubGitHub Advisory DatabaseGHSA-G82W-58JF-GCXX
HistoryMay 26, 2023 - 1:59 p.m.

secrets-store-csi-driver discloses service account tokens in logs

2023-05-2613:59:19
CWE-532
GitHub Advisory Database
github.com
12
secrets-store-csi-driver
service account tokens
logs
vulnerability
upgrade
cloud vault solutions

CVSS3

6.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS

0

Percentile

15.5%

A security issue was discovered in 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 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-2023-2878

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.

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

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:

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

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 [email protected]

Affected configurations

Vulners
Node
sigs.k8s.iosecrets-store-csi-driverRange<1.3.3
VendorProductVersionCPE
sigs.k8s.iosecrets-store-csi-driver*cpe:2.3:a:sigs.k8s.io:secrets-store-csi-driver:*:*:*:*:*:*:*:*

CVSS3

6.5

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS

0

Percentile

15.5%