net: incorrect parsing of extraneous zero characters at the beginning of an IP address octet
CVE: CVE-2021-29923
Component: golang
CWE: CWE-20
Severity: Moderate
CVSS v3: 7.3/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Release date: 2021-03-22T00:00:00+00:00

A flaw was found in golang. Extraneous zero characters at the beginning of an IP address octet are not properly considered which could allow an attacker to bypass IP-based access controls. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Statement: This vulnerability potentially affects any component written in Go that uses the net standard library and ParseIP / ParseCIDR functions. There are components which might not use these functions or might use them to parse IP addresses and not manage them in any way (only store information about the ip address) . This reduces the severity of this vulnerability to Low for the following offerings:
* OpenShift distributed tracing (formerly OpenShift Jaeger)
* OpenShift Migration Toolkit for Containers
* OpenShift Container Platform

Remediation:
For OpenShift Container Platform 4.9 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/4.9/release_notes/ocp-4-9-release-notes.html

Details on how to access this content are available at
https://docs.openshift.com/container-platform/4.9/updating/updating-cluster-cli.html
The OpenShift Service Mesh release notes provide information on the features and known issues:

https://docs.openshift.com/container-platform/latest/service_mesh/v2x/servicemesh-release-notes.html
See the Red Hat OpenShift Container Platform 4.6 documentation at:
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.6/html/serverless/index
See the Red Hat OpenShift Container Platform 4.7 documentation at:
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.7/html/serverless/index
See the Red Hat OpenShift Container Platform 4.8 documentation at:
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.8/html/serverless/index
See the Red Hat OpenShift Container Platform 4.9 documentation at:
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.9/html/serverless/index
See the Red Hat OpenShift Container Platform 4.6 documentation at:
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.6/html/serverless/index
See the Red Hat OpenShift Container Platform 4.7 documentation at:
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.7/html/serverless/index
See the Red Hat OpenShift Container Platform 4.8 documentation at:
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.8/html/serverless/index
See the Red Hat OpenShift Container Platform 4.9 documentation at:
https://access.redhat.com/documentation/en-us/openshift_container_platform/4.9/html/serverless/index
To take advantage of these new features, fixes and changes, please upgrade Red Hat Advanced Cluster Security for Kubernetes to version 3.67.
To take advantage of the new features, bug fixes and security patches issued in 3.68 you are advised to upgrade to patch release 3.68.0.
For Windows Machine Config Operator upgrades, see the following documentation: https://docs.openshift.com/container-platform/latest/windows_containers/windows-node-upgrades.html
For OpenShift Container Platform 4.9 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/4.9/release_notes/ocp-4-9-release-notes.html

Details on how to access this content are available at
https://docs.openshift.com/container-platform/4.9/updating/updating-cluster-cli.html
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.