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Red Hat Security Advisory 2021-1561-01

Red Hat Security Advisory 2021-1561-01
Posted May 24, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-1561-01 - Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. Issues addressed include denial of service and integer overflow vulnerabilities.

tags | advisory, denial of service, overflow, vulnerability
systems | linux, redhat
advisories | CVE-2020-27813, CVE-2020-28362, CVE-2021-21639, CVE-2021-21640, CVE-2021-28163, CVE-2021-28165, CVE-2021-30465, CVE-2021-3114
SHA-256 | e437a61a204e88b9037921ae3b96cf5eda566c7c4b860b2e62104b2092615796

Red Hat Security Advisory 2021-1561-01

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Red Hat Security Advisory

Synopsis: Moderate: OpenShift Container Platform 4.7.12 bug fix and security update
Advisory ID: RHSA-2021:1561-01
Product: Red Hat OpenShift Enterprise
Advisory URL: https://access.redhat.com/errata/RHSA-2021:1561
Issue date: 2021-05-24
CVE Names: CVE-2020-27813 CVE-2020-28362 CVE-2021-3114
CVE-2021-21639 CVE-2021-21640 CVE-2021-28163
CVE-2021-28165 CVE-2021-30465
1. Summary:

Red Hat OpenShift Container Platform release 4.7.12 is now available with
updates to packages and images that fix several bugs.

This release includes a security update for Red Hat OpenShift Container
Platform 4.7.12.

Red Hat Product Security has rated this update as having a security impact
of Moderate. 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.

2. Description:

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

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 4.7.12. See the following advisory for the RPM packages for this


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:


This update fixes the following bugs among others:

* Previously, the node-exporter daemonset's mountstats collector caused
high memory usage on nodes with NFS mount points. By disabling the
mountstats collector, this fix reduces memory usage. (BZ#1955469)

* A previous change to gophercloud/utils introduced a custom HTTP client
that uses a self-signed certificate. But because this change removed
settings from DefaultTransport, including those for proxy environment
variables, this caused failures for installations that use both self-signed
certificates and proxies. In this update, the custom HTTP client inherits
settings from DefaultTransport, so now OCP can be installed with
self-signed certificates and proxies. (BZ#1943500)

* Previously, bare metal deployments failed when large packet transfers
between Ironic and the RAM disk resulted in connection failures. In this
update, Ironic queries the RAM disk for information to work around the
connection error, allowing deployments to succeed.(BZ#1958965)

* Previously, when an IPv6 cluster was started on nodes that had IPv4
addresses, kublet sometimes used the nodes' IPv4 IP addresses instead of
their IPv6 IP addresses, which prevented host-network pods from reaching
IPv6-only pods. This update changes the way node IP addresses are chosen.
Now, all nodes have IPv6 addresses. (BZ#1942488)

* Previously, OVN changed the source IP addresses of hairpin traffic
packets to the IP address of the load balancer, which sometimes blocked
traffic when a network policy was in use. With this update, Kuryr opens
traffic to the IP addresses of all services in a network policy's
namespace, and hairpin traffic flows freely. (BZ#1959766)

Security Fix(es):

* golang-github-gorilla-websocket: integer overflow leads to denial of
service (CVE-2020-27813)

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.

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

(For x86_64 architecture)

$ oc adm release info

The image digest is

(For s390x architecture)

$ oc adm release info

The image digest is

(For ppc64le architecture)

$ oc adm release info

The image digest is

All OpenShift Container Platform 4.7 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
- -between-minor.html#understanding-upgrade-channels_updating-cluster-between
- -minor

3. Solution:

For OpenShift Container Platform 4.7 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:


Details on how to access this content are available at
- -cli.html

4. Bugs fixed (https://bugzilla.redhat.com/):

1902111 - CVE-2020-27813 golang-github-gorilla-websocket: integer overflow leads to denial of service
1926577 - newly added 'excessive etcd leader changes' test case failing in serial job
1942141 - [4.7] cinder storageclass creates persistent volumes with wrong label failure-domain.beta.kubernetes.io/zone in multi availability zones architecture on OSP 16.
1942488 - [4.7] dual stack nodes with OVN single ipv6 fails on bootstrap phase
1943500 - openshift installer fails immediately failed to fetch Install Config
1947097 - [4.7z] upgrade from ocp 4.5 to 4.6 does not clear SNAT rules on ovn
1948396 - [oVirt] oVirt credentials secret contains unnecessary "ovirt_cafile"
1950261 - 4.7->4.6 rollbacks stuck on prometheusrules admission webhook "no route to host"
1951726 - [OCP 4.7] Slow PV creation with vsphere
1952149 - oc adm top reporting unknown status for Windows node
1955449 - [4.7] Drop crio image metrics with high cardinality
1955462 - [4.7] Drop container_memory_failures_total metric because of high cardinality
1955469 - [4.7] Disable collection of node_mountstats_nfs metrics in node_exporter
1955689 - MAO does not react to events triggered from Validating Webhook Configurations
1955883 - Backport upstream fix for Kubelet getting stuck in DiskPressure
1956270 - endpoint slice controller doesn't handle services target port correctly
1956797 - [4.7] Panic in authentication-operator invoking webhook authorization
1958797 - Only run test/extended/router/idle tests on OpenshiftSDN or OVNKubernetes
1958965 - Ironic execute_deploy_steps command to ramdisk times out, resulting in a failed deployment in 4.7
1959009 - operator-lifecycle-manager-packageserver flaps Available├║lse despite unavailableReplicas <= maxUnavailable
1959191 - Set LABEL io.openshift.release.operator=true for driver-toolkit image addition to payload
1959766 - Problem in trying to connect through the service to a member that is the same as the caller.
1960275 - e2e fix for third-party network plugin conformance testing

5. References:


6. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
Version: GnuPG v1


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