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Plaintext storage of sensitive data in Rancher API and cluster.management.cattle.io objects
This issue affects Rancher versions from 2.5.0 up to and including 2.5.16, from 2.6.0 up to and including 2.6.9 and 2.7.0. It was discovered that the security advisory CVE-2021-36782 (GHSA-g7j7-h4q8-8w2f), previously released by Rancher, missed addressing some sensitive fields, secret tokens, encryption keys, and SSH keys that were still being stored in plaintext directly on Kubernetes objects like
The exposed credentials are visible in Rancher to authenticated
Project Owners and
Project Members of that cluster on the endpoints:
The remaining sensitive fields are now stripped from
Clusters and other objects and moved to a
Secret before the object is stored. The
Secret is retrieved when the credential is needed. For objects that existed before this security fix, a one-time migration happens on startup.
The fields that have been addressed by this security fix are:
Cluster.Spec.RancherKubernetesEngineConfig.Services.Kubelet.ExtraEnvwhen containing the
For the exposure of credentials not related to Rancher, the final impact severity for confidentiality, integrity and availability is dependent on the permissions the leaked credentials have on their services.
It is recommended to review for potentially leaked credentials in this scenario and to change them if deemed necessary.
There is no direct mitigation besides updating Rancher to a patched version.
Patched versions include releases 2.5.17, 2.6.10, 2.7.1 and later versions.
After upgrading to a patched version, it is important to check for the
RKESecretsMigrated conditions on
ClusterTemplateRevisions to confirm when secrets have been fully migrated off of those objects, and the objects scoped within them.
For more information
If you have any questions or comments about this advisory:
- Reach out to SUSE Rancher Security team for security related inquiries.
- Open an issue in Rancher repository.
- Verify our support matrix and product support lifecycle.
Source: GitHub Advisory Database
Published: 4 days ago
Updated: 4 days ago
CVSS Score: 9.9
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Identifiers: GHSA-cq4p-vp5q-4522, CVE-2022-43757
Fixed in: 2.7.1, 2.6.10, 2.5.17