Rancher allows privilege escalation in Windows nodes due to Insecure Access Control Lists in github.com/rancher/rancher

Open Source Vulnerabilities CVE-2023-32196

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.

Open Source Vulnerabilities GHSA-64jq-m7rq-768h

### 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://attack.mitre.org/techniques/T1068/) for further information about this category of attack. ### Patches Patched versions include releases `2.7.14` and `2.8.5`. ### Workarounds The following script was developed for Rancher Manager administrators to identify `RoleTemplates` impacted by this vulnerability. The script requires `jq` installed and a `kubeconfig` with access to Rancher local cluster; it can also be executed in Rancher's kubectl shell. ```bash #!/bin/bash set -euo pipefail # get all RoleTemplates with .context == "project" or .context == "" that don't have externalRules. rts=$(kubectl get roletemplates -o json | jq -r '.items[] | select((.context == "project" or .context == "") and .external == true and .externalRules == null and .builtin == false) | .metadata.name') found_invalid_rt=false for rt in $rts; do if ! kubectl get clusterrole "$rt" > /dev/null 2>&1; then echo "$rt" # prints RoleTemplate names that don't have a backing ClusterRole found_invalid_rt=true fi done if ! $found_invalid_rt ; then echo 'This cluster is not affected by CVE-2023-32197: no RoleTemplate objects found' fi ``` It will return all objects affected by this vulnerability. The administrator can fix those objects by creating the backing `ClusterRole` that they refer to. ### References - [CVE-2023-32196](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-32196) If you have any questions or comments about this advisory: - Reach out to the [SUSE Rancher Security team](https://github.com/rancher/rancher/security/policy) for security-related inquiries. - Open an issue in the [Rancher](https://github.com/rancher/rancher/issues/new/choose) repository. - Verify with our [support matrix](https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/) and [product support lifecycle](https://www.suse.com/lifecycle/).

Open Source Vulnerabilities GO-2024-2929

Rancher's External RoleTemplates can lead to privilege escalation in github.com/rancher/rancher. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/rancher/rancher from v2.7.0 before v2.7.14, from v2.8.0 before v2.8.5.

Open Source Vulnerabilities GHSA-7h8m-pvw3-5gh4

### Impact A vulnerability has been identified whereby Rancher Manager deployments containing Windows nodes have weak Access Control Lists (ACL), allowing `BUILTIN\Users` or `NT AUTHORITY\Authenticated Users` to view or edit sensitive files which could lead to privilege escalation. The affected files include binaries, scripts, configuration and log files: ``` C:\etc\rancher\wins\config C:\var\lib\rancher\agent\rancher2_connection_info.json C:\etc\rancher\rke2\config.yaml.d\50-rancher.yaml C:\var\lib\rancher\agent\applied\*-*-applied.plan C:\usr\local\bin\rke2 C:\var\lib\rancher\capr\idempotence\idempotent.sh ``` RKE2 nodes expand the list to include the files below: ``` C:\etc\rancher\node\password C:\var\lib\rancher\rke2\agent\logs\kubelet.log C:\var\lib\rancher\rke2\data\v1.**.**-rke2r*-windows-amd64-*\bin\* C:\var\lib\rancher\rke2\bin\* ``` **This vulnerability is exclusive to deployments that contain Windows nodes. Linux-only environments are not affected by it.** Please consult the associated [MITRE ATT&CK - Technique - Exploitation for Privilege Escalation](https://attack.mitre.org/techniques/T1068/) for further information about this category of attack. ### Patches Patched versions include Rancher Manager `2.8.9` and `2.9.3`. For RKE2 Windows nodes, please refer to its [specific advisory](https://github.com/rancher/rke2/security/advisories/GHSA-x7xj-jvwp-97rv). No patches are available for 2.7, therefore users are urged to upgrade to newer minor versions or to apply the manual workaround below. ### Workarounds Users are advised to upgrade to a patched version of Rancher Manager. When that is not possible, users can enforce stricter ACLs for all sensitive files affected by this Security Advisory running [this](https://github.com/rancherlabs/support-tools/blob/master/windows-access-control-lists/README.md) PowerShell script as an Administrator on each node. ### References - [CVE-2023-32197](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-32197) - [RKE2’s GHSA-x7xj-jvwp-97rv](https://github.com/rancher/rke2/security/advisories/GHSA-x7xj-jvwp-97rv) ### For more information If you have any questions or comments about this advisory: - Reach out to the [SUSE Rancher Security team](https://github.com/rancher/rancher/security/policy) for security related inquiries. - Open an issue in the [Rancher](https://github.com/rancher/rancher/issues/new/choose) repository. - Verify with our [support matrix](https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/) and [product support lifecycle](https://www.suse.com/lifecycle/).

Open Source Vulnerabilities GO-2024-3220

Rancher allows privilege escalation in Windows nodes due to Insecure Access Control Lists in github.com/rancher/rancher. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/rancher/rancher from v2.7.0 before v2.8.9, from v2.9.0 before v2.9.3.