Rancher CVEs and Resolutions

Rancher is committed to informing the community of security issues in our products. Rancher will publish CVEs (Common Vulnerabilities and Exposures) for issues we have resolved.

IDDescriptionDateResolution
CVE-2021-25318A vulnerability was discovered in Rancher versions 2.0 through the aforementioned fixed versions, where users were granted access to resources regardless of the resource’s API group. For example, Rancher should have allowed users access to apps.catalog.cattle.io, but instead incorrectly gave access to apps.*. Resources affected in the Downstream clusters and Rancher management cluster can be found here. There is not a direct mitigation besides upgrading to the patched Rancher versions.14 Jul 2021Rancher v2.5.9 and Rancher v2.4.16
CVE-2021-31999A vulnerability was discovered in Rancher 2.0.0 through the aforementioned patched versions, where a malicious Rancher user could craft an API request directed at the proxy for the Kubernetes API of a managed cluster to gain access to information they do not have access to. This is done by passing the “Impersonate-User” or “Impersonate-Group” header in the Connection header, which is then correctly removed by the proxy. At this point, instead of impersonating the user and their permissions, the request will act as if it was from the Rancher management server and incorrectly return the information. The vulnerability is limited to valid Rancher users with some level of permissions on the cluster. There is not a direct mitigation besides upgrading to the patched Rancher versions.14 Jul 2021Rancher v2.5.9 and Rancher v2.4.16
CVE-2021-25320A vulnerability was discovered in Rancher 2.2.0 through the aforementioned patched versions, where cloud credentials weren’t being properly validated through the Rancher API. Specifically through a proxy designed to communicate with cloud providers. Any Rancher user that was logged-in and aware of a cloud-credential ID that was valid for a given cloud provider, could call that cloud provider’s API through the proxy API, and the cloud-credential would be attached. The exploit is limited to valid Rancher users. There is not a direct mitigation outside of upgrading to the patched Rancher versions.14 Jul 2021Rancher v2.5.9 and Rancher v2.4.16
CVE-2021-25313A security vulnerability was discovered on all Rancher 2 versions. When accessing the Rancher API with a browser, the URL was not properly escaped, making it vulnerable to an XSS attack. Specially crafted URLs to these API endpoints could include JavaScript which would be embedded in the page and execute in a browser. There is no direct mitigation. Avoid clicking on untrusted links to your Rancher server.2 Mar 2021Rancher v2.5.6, Rancher v2.4.14, and Rancher v2.3.11
CVE-2019-14435This vulnerability allows authenticated users to potentially extract otherwise private data out of IPs reachable from system service containers used by Rancher. This can include but not only limited to services such as cloud provider metadata services. Although Rancher allow users to configure whitelisted domains for system service access, this flaw can still be exploited by a carefully crafted HTTP request. The issue was found and reported by Matt Belisle and Alex Stevenson at Workiva.5 Aug 2019Rancher v2.2.7 and Rancher v2.1.12
CVE-2019-14436The vulnerability allows a member of a project that has access to edit role bindings to be able to assign themselves or others a cluster level role granting them administrator access to that cluster. The issue was found and reported by Michal Lipinski at Nokia.5 Aug 2019Rancher v2.2.7 and Rancher v2.1.12
CVE-2019-13209The vulnerability is known as a Cross-Site Websocket Hijacking attack. This attack allows an exploiter to gain access to clusters managed by Rancher with the roles/permissions of a victim. It requires that a victim to be logged into a Rancher server and then access a third-party site hosted by the exploiter. Once that is accomplished, the exploiter is able to execute commands against the Kubernetes API with the permissions and identity of the victim. Reported by Matt Belisle and Alex Stevenson from Workiva.15 Jul 2019Rancher v2.2.5, Rancher v2.1.11 and Rancher v2.0.16
CVE-2019-12303Project owners can inject extra fluentd logging configurations that makes it possible to read files or execute arbitrary commands inside the fluentd container. Reported by Tyler Welton from Untamed Theory.5 Jun 2019Rancher v2.2.4, Rancher v2.1.10 and Rancher v2.0.15
CVE-2019-12274Nodes using the built-in node drivers using a file path option allows the machine to read arbitrary files including sensitive ones from inside the Rancher server container.5 Jun 2019Rancher v2.2.4, Rancher v2.1.10 and Rancher v2.0.15
CVE-2019-11202The default admin, that is shipped with Rancher, will be re-created upon restart of Rancher despite being explicitly deleted.16 Apr 2019Rancher v2.2.2, Rancher v2.1.9 and Rancher v2.0.14
CVE-2019-6287Project members continue to get access to namespaces from projects that they were removed from if they were added to more than one project.29 Jan 2019Rancher v2.1.6 and Rancher v2.0.11
CVE-2018-20321Any project member with access to the default namespace can mount the netes-default service account in a pod and then use that pod to execute administrative privileged commands against the Kubernetes cluster.29 Jan 2019Rancher v2.1.6 and Rancher v2.0.11 - Rolling back from these versions or greater have specific instructions.