CVE-2021-20198

Name of the Vulnerable Software and Affected Versions: OpenShift Installer versions prior to v0.9.0-master.0.20210125200451-95101da940b0

Description: A flaw was found in the OpenShift Installer. During installation of OpenShift Container Platform 4 clusters, bootstrap nodes are provisioned with anonymous authentication enabled on kubelet port 10250. A remote attacker able to reach this port during installation can make unauthenticated /exec requests to execute arbitrary commands within running containers. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Recommendations: For OpenShift Installer versions prior to v0.9.0-master.0.20210125200451-95101da940b0, update to version v0.9.0-master.0.20210125200451-95101da940b0 or later to resolve the issue. As a temporary workaround, consider disabling anonymous authentication on kubelet port 10250 during installation to minimize the risk of exploitation. Restrict access to the /exec endpoint to prevent unauthenticated requests.