It was found in OpenShift Container Platform 4 that ignition config, served by the Machine Config Server, can be accessed externally from clusters without authentication. The MCS endpoint (port 22623) provides ignition configuration used for bootstrapping Nodes and can include some sensitive data, e.g. registry pull secrets. There are two scenarios where this data can be accessed. The first is on Baremetal, OpenStack, Ovirt, Vsphere and KubeVirt deployments which do not have a separate internal API endpoint and allow access from outside the cluster to port 22623 from the standard OpenShift API Virtual IP address. The second is on cloud deployments when using unsupported network plugins, which do not create iptables rules that prevent to port 22623. In this scenario, the ignition config is exposed to all pods within the cluster and cannot be accessed externally.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2022-04-01T22:17:25

Updated: 2024-08-03T17:37:22.965Z

Reserved: 2020-12-17T00:00:00

Link: CVE-2021-20238

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2022-04-01T23:15:08.727

Modified: 2023-06-26T18:00:49.937

Link: CVE-2021-20238

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-02-05T00:00:00Z

Links: CVE-2021-20238 - Bugzilla