RHSA-2021:4829 - Security Advisory

Topic

Red Hat OpenShift Container Platform release 4.8.22 is now available with updates to packages and images that fix several bugs and add enhancements.

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.

This advisory contains the RPM packages for Red Hat OpenShift Container Platform 4.8.22. See the following advisory for the container images for this release:

https://access.redhat.com/errata/RHBA-2021:4830

All OpenShift Container Platform 4.8 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/4.8/updating/updating-cluster-between-minor.html#understanding-upgrade-channels_updating-cluster-between-minor

Security Fix(es):

• jenkins-2-plugins/subversion: does not restrict the name of a file when looking up a subversion key (CVE-2021-21698)
• jenkins: FilePath#mkdirs does not check permission to create parent directories (CVE-2021-21685)
• jenkins: File path filters do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories (CVE-2021-21686)
• jenkins: FilePath#untar does not check permission to create symbolic links when unarchiving a symbolic link (CVE-2021-21687)
• jenkins: FilePath#reading(FileVisitor) does not reject any operations allowing users to have unrestricted read access (CVE-2021-21688)
• coreos-installer: restrict access permissions on /boot/ignition{,/config.ign} (CVE-2021-3917)
• jenkins: FilePath#unzip and FilePath#untar were not subject to any access control (CVE-2021-21689)
• jenkins: Agent processes are able to completely bypass file path filtering by wrapping the file operation in an agent file path (CVE-2021-21690)
• jenkins: Creating symbolic links is possible without the symlink permission (CVE-2021-21691)
• jenkins: The operations FilePath#renameTo and FilePath#moveAllChildrenTo only check read permission on the source path (CVE-2021-21692)
• jenkins: When creating temporary files, permission to create files is only checked after they’ve been created. (CVE-2021-21693)
• jenkins: FilePath#toURI, FilePath#hasSymlink, FilePath#absolutize, FilePath#isDescendant, and FilePath#get*DiskSpace do not check any permissions (CVE-2021-21694)
• jenkins: FilePath#listFiles lists files outside directories with agent read access when following symbolic links. (CVE-2021-21695)
• jenkins: Agent-to-controller access control allowed writing to sensitive directory used by Pipeline: Shared Groovy Libraries Plugin (CVE-2021-21696)
• jenkins: Agent-to-controller access control allows reading/writing most content of build directories (CVE-2021-21697)

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.

Solution

For OpenShift Container Platform 4.8 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/4.8/release_notes/ocp-4-8-release-notes.html

Details on how to access this content are available at
https://docs.openshift.com/container-platform/4.8/updating/updating-cluster-cli.html

Affected Products

• Red Hat OpenShift Container Platform 4.8 for RHEL 8 x86_64
• Red Hat OpenShift Container Platform 4.8 for RHEL 7 x86_64
• Red Hat OpenShift Container Platform for Power 4.8 for RHEL 8 ppc64le
• Red Hat OpenShift Container Platform for IBM Z and LinuxONE 4.8 for RHEL 8 s390x

Fixes

• BZ - 2018478 - CVE-2021-3917 coreos-installer: restrict access permissions on /boot/ignition{,/config.ign}
• BZ - 2020322 - CVE-2021-21685 jenkins: FilePath#mkdirs does not check permission to create parent directories
• BZ - 2020323 - CVE-2021-21686 jenkins: File path filters do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories
• BZ - 2020324 - CVE-2021-21687 jenkins: FilePath#untar does not check permission to create symbolic links when unarchiving a symbolic link
• BZ - 2020327 - CVE-2021-21688 jenkins: FilePath#reading(FileVisitor) does not reject any operations allowing users to have unrestricted read access
• BZ - 2020335 - CVE-2021-21689 jenkins: FilePath#unzip and FilePath#untar were not subject to any access control
• BZ - 2020336 - CVE-2021-21690 jenkins: Agent processes are able to completely bypass file path filtering by wrapping the file operation in an agent file path
• BZ - 2020338 - CVE-2021-21691 jenkins: Creating symbolic links is possible without the symlink permission
• BZ - 2020339 - CVE-2021-21692 jenkins: The operations FilePath#renameTo and FilePath#moveAllChildrenTo only check read permission on the source path
• BZ - 2020341 - CVE-2021-21693 jenkins: When creating temporary files, permission to create files is only checked after they’ve been created.
• BZ - 2020342 - CVE-2021-21694 jenkins: FilePath#toURI, FilePath#hasSymlink, FilePath#absolutize, FilePath#isDescendant, and FilePath#get*DiskSpace do not check any permissions
• BZ - 2020343 - CVE-2021-21695 jenkins: FilePath#listFiles lists files outside directories with agent read access when following symbolic links.
• BZ - 2020344 - CVE-2021-21696 jenkins: Agent-to-controller access control allowed writing to sensitive directory used by Pipeline: Shared Groovy Libraries Plugin
• BZ - 2020345 - CVE-2021-21697 jenkins: Agent-to-controller access control allows reading/writing most content of build directories
• BZ - 2020385 - CVE-2021-21698 jenkins-2-plugins/subversion: does not restrict the name of a file when looking up a subversion key

CVEs

• CVE-2021-3917
• CVE-2021-21685
• CVE-2021-21686
• CVE-2021-21687
• CVE-2021-21688
• CVE-2021-21689
• CVE-2021-21690
• CVE-2021-21691
• CVE-2021-21692
• CVE-2021-21693
• CVE-2021-21694
• CVE-2021-21695
• CVE-2021-21696
• CVE-2021-21697
• CVE-2021-21698

References

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