A vulnerability has been identified whereby privilege escalation checks are not properly enforced for RoleTemplateobjects when external=true, which in specific scenarios can lead to privilege escalation.

Affected: Go: github.com/rancher/rancher

### Impact A vulnerability has been identified whereby privilege escalation checks are not properly enforced for `RoleTemplate`objects when external=true, which in specific scenarios can lead to privilege escalation.

The bug in the webhook rule resolver ignores rules from a `ClusterRole` for external `RoleTemplates` when its context is set to either `project` or is left empty. The fix introduces a new field to the `RoleTemplate` CRD named `ExternalRules`. The new field will be used to resolve rules directly from the `RoleTemplate`. Additionally, rules from the backing `ClusterRole` will be used if `ExternalRules` is not provided. The new field will always take precedence when it is set, and serve as the source of truth for rules used when creating Rancher resources on the local cluster.

Please note that this is a breaking change for external `RoleTemplates`, when context is set to `project` or empty and the backing `ClusterRole` does not exist, as this was not previously required.

**Important:** The fix is automatically applied when upgrading to the release lines `2.8`and above. For users still on the `2.7` release line, after the upgrade to a patched version, users are required to opt-in to the fix by enabling the `external-rules` [feature flag](https://ranchermanager.docs.rancher.com/getting-started/installation-and-upgrade/installation-references/feature-flags).

Please consult the associated [MITRE ATT&CK - Technique - Exploitation for Privilege Escalation](https://at…

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