RHSA-2021:0281 - Security Advisory

Topic

Red Hat OpenShift Container Platform release 4.4.33 is now available with
updates to packages and images that fix several bugs and add enhancements.

This release also includes a security update for Red Hat OpenShift Container Platform 4.4.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Red Hat OpenShift Container Platform is Red Hat's cloud computing
Kubernetes application platform solution designed for on-premise or private
cloud deployments.

Security Fix(es):

• openshift: builder allows read and write of block devices (CVE-2021-20182)
• kubernetes: Compromised node could escalate to cluster level privileges (CVE-2020-8559)
• kubernetes: Docker config secrets leaked when file is malformed and loglevel >= 4 (CVE-2020-8564)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This advisory contains the container images for Red Hat OpenShift Container Platform 4.4.33. See the following advisory for the RPM packages for this release:

https://access.redhat.com/errata/RHSA-2021:0282

Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes:

https://docs.openshift.com/container-platform/4.4/release_notes/ocp-4-4-release-notes.html

This update fixes the following bugs among others:

• Previously, there were broken connections to the API server that caused nodes to remain in the NotReady state. Detecting a broken network connection could take up to 15 minutes, during which the platform would remain unavailable. This is now fixed by setting the TCP_USER_TIMEOUT socket option, which controls how long transmitted data can be unacknowledged before the connection is forcefully closed. (BZ#1907939)
• Previously, the quota controllers only worked on resources retrieved from the discovery endpoint, which might contain only a fraction of all resources due to a network error. This is now fixed by having the quota controllers periodically resync when new resources are observed from the discovery endpoint. (BZ#1910096)
• Previously, the kuryr-controller was comparing security groups related to

network policies incorrectly. This caused security rules related to a
network policy to be recreated on every minor update of that network
policy. This bug has been fixed, allowing network policy updates that
already have existing rules to be preserved; network policy additions or
deletions are performed, if needed. (BZ#1910221)

You may download the oc tool and use it to inspect release image metadata as follows:

(For x86_64 architecture)

$ oc adm release info quay.io/openshift-release-dev/ocp-release:4.4.33-x86_64

The image digest is sha256:a035dddd8a5e5c99484138951ef4aba021799b77eb9046f683a5466c23717738

(For s390x architecture)

$ oc adm release info quay.io/openshift-release-dev/ocp-release:4.4.33-s390x

The image digest is sha256:ecc1e5aaf8496dd60a7703562fd6c65541172a56ae9008fce6db5d55e43371dc

(For ppc64le architecture)

$ oc adm release info quay.io/openshift-release-dev/ocp-release:4.4.33-ppc64le

The image digest is sha256:567bf8031c80b08e3e56a57e1c8e5b0b01a2f922e01b36ee333f6ab5bff95495

All OpenShift Container Platform 4.4 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift Console or the CLI oc command. Instructions for upgrading a cluster are available
at https://docs.openshift.com/container-platform/4.4/updating/updating-cluster-between-minor.html#understanding-upgrade-channels_updating-cluster-between-minor.

Solution

For OpenShift Container Platform 4.4 see the following documentation, which
will be updated shortly for this release, for important instructions on how
to upgrade your cluster and fully apply this asynchronous errata update:

https://docs.openshift.com/container-platform/4.4/release_notes/ocp-4-4-release-notes.html

Details on how to access this content are available at
https://docs.openshift.com/container-platform/4.4/updating/updating-cluster-cli.html.

Affected Products

• Red Hat OpenShift Container Platform 4.4 for RHEL 8 x86_64
• Red Hat OpenShift Container Platform 4.4 for RHEL 7 x86_64
• Red Hat OpenShift Container Platform for Power 4.4 for RHEL 8 ppc64le
• Red Hat OpenShift Container Platform for Power 4.4 for RHEL 7 ppc64le
• Red Hat OpenShift Container Platform for IBM Z and LinuxONE 4.4 for RHEL 8 s390x
• Red Hat OpenShift Container Platform for IBM Z and LinuxONE 4.4 for RHEL 7 s390x

Fixes

• BZ - 1848516 - [4.4] Unresponsive OpenShift 4.4 cluster on Azure (UPI)
• BZ - 1851422 - CVE-2020-8559 kubernetes: compromised node could escalate to cluster level privileges
• BZ - 1886637 - CVE-2020-8564 kubernetes: Docker config secrets leaked when file is malformed and loglevel >= 4
• BZ - 1895332 - NP CRD unable to be patched because of missing sg rule ID
• BZ - 1897546 - Backup taken on one master cannot be restored on other masters
• BZ - 1900727 - Using shareProcessNamespace with default pod image leaves unreaped processes
• BZ - 1904413 - (release 4.4) Hostsubnet gatherer produces wrong output
• BZ - 1905891 - genericapiserver library must wait for server.Shutdown
• BZ - 1906484 - Etcd container leaves grep and lsof zombie processes
• BZ - 1907939 - Nodes goes into NotReady state (VMware)
• BZ - 1910096 - [release-4.4] The quota controllers should resync on new resources and make progress
• BZ - 1910221 - kuryr tempest plugin test test_ipblock_network_policy_sg_rules fails
• BZ - 1915110 - CVE-2021-20182 openshift: builder allows read and write of block devices
• BZ - 1916952 - OperatorExited, Pending marketplace-operator-... pod for several weeks
• BZ - 1917416 - e2e: should be able to pull image from docker hub is failing permanently
• BZ - 1918609 - ARO/Azure: excessive pod memory allocation causes node lockup
• BZ - 1918974 - [sig-devex][Feature:ImageEcosystem][Slow] openshift images should be SCL enabled returning s2i usage when running the image

CVEs

• CVE-2020-2304
• CVE-2020-2305
• CVE-2020-8559
• CVE-2020-8564
• CVE-2020-14382
• CVE-2020-25681
• CVE-2020-25682
• CVE-2020-25683
• CVE-2020-25684
• CVE-2020-25685
• CVE-2020-25686
• CVE-2020-25687
• CVE-2020-25694
• CVE-2020-25696
• CVE-2021-20182

References

• https://access.redhat.com/security/updates/classification/#important