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Failure to properly sanitize credentials in cluster template answers

Critical
rmweir published GHSA-8w87-58w6-hfv8 Aug 19, 2022

Package

gomod rancher/rancher (Go)

Affected versions

From 2.5.0 and 2.6.0 up to and including 2.5.12 and 2.6.3

Patched versions

2.5.13, 2.6.4 and later releases

Description

Impact

It was discovered that in Rancher versions up to and including 2.5.12 and 2.6.3 there is a failure to properly sanitize credentials in cluster template answers. This failure can lead to plaintext storage and exposure of credentials, passwords and API tokens.

The exposed credentials are visible in Rancher to authenticated Cluster Owners, Cluster Members, Project Owners and Project Members on the endpoints /v1/management.cattle.io.clusters, /v3/clusters and /k8s/clusters/local/apis/management.cattle.io/v3/clusters.

Sensitive fields are now stripped from Clusters objects before the object is stored. For objects that existed before this security fix, a one-time migration happens on startup.

Important:

  • It is highly advised to review for potential leaked credentials in this scenario, and to change them if deemed necessary.
  • The final impact severity for confidentiality, integrity and availability is dependent on the permissions that the leaked credentials have on their own services.

Patches

Patched versions include releases 2.5.13, 2.6.4 and later versions.

Workarounds

Limit access in Rancher to trusted users. There is not a direct mitigation besides upgrading to the patched Rancher versions.

Important: It is highly advised to review for potential leaked credentials in this scenario, and to change them if deemed necessary.

For more information

If you have any questions or comments about this advisory:

Severity

Critical
9.9
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVE ID

CVE-2021-36783