A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

The remote Redhat Enterprise Linux 7 / 8 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2021:3635 advisory.

    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 4.7.32. See the following     advisory for the container images for this release:

    https://access.redhat.com/errata/RHBA-2021:3636

    Security Fix(es):

    * [kubernetes: Symlink exchange can allow host filesystem access (CVE-2021-25741)]

    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.

    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 at     https://docs.openshift.com/container-platform/4.7/updating/updating-cluster-between-     minor.html#understanding-upgrade-channels_updating-cluster-between-minor

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 / 8 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2021:3642 advisory.

    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):

    * kubernetes: Symlink exchange can allow host filesystem access (CVE-2021-25741)

    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.

    All OpenShift Container Platform 4.6 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/4.6/updating/updating-cluster-between-     minor.html#understanding-upgrade-channels_updating-cluster-between-minor

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9546 advisory.

    - Update Kubernetes version to 1.20.11 to address CVE-2021-25741
    - Update Istio to 1.9.8, 1.10.4 to address CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780     & CVE-2021-32781
    - Bump release, addresses the following envoy CVEs,       CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 & CVE-2021-32781
    - Bump release, addresses the following envoy CVEs,       CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 & CVE-2021-32781
    - Bump release for CVE fix, addresses CVE-2021-25741

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9526 advisory.

    - Update Kubernetes version to 1.20.11 to address CVE-2021-25741
    - Update Istio to 1.9.8, 1.10.4 to address CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780     & CVE-2021-32781
    - Bump release, addresses the following envoy CVEs,       CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 & CVE-2021-32781
    - Bump release, addresses the following envoy CVEs,       CVE-2021-32777, CVE-2021-32778, CVE-2021-32779, CVE-2021-32780 & CVE-2021-32781
    - Bump release for CVE fix, addresses CVE-2021-25741

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the kubernetes package has been released.

The remote Redhat Enterprise Linux 7 / 8 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2021:3631 advisory.

    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 4.8.13. See the following advisory for the container images for     this release:

    https://access.redhat.com/errata/RHSA-2021:3632

    Security Fix(es):

    * kubernetes: Symlink exchange can allow host filesystem access (CVE-2021-25741)

    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.

    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

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:3646 advisory.

    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. See the following advisory for the container images for     this release:

    https://access.redhat.com/errata/RHBA-2021:3647

    All OpenShift Container Platform 3.11 users are advised to upgrade to these     updated packages and images.

    Security Fix(es):

    * kubernetes: Symlink exchange can allow host filesystem access (CVE-2021-25741)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
165142	RHEL 7 / 8 : OpenShift Container Platform 4.7.32 (RHSA-2021:3635)	Nessus	Red Hat Local Security Checks	high
165125	RHEL 7 / 8 : OpenShift Container Platform 4.6.46 (RHSA-2021:3642)	Nessus	Red Hat Local Security Checks	high
155011	Oracle Linux 8 : olcne / istio / istio / kubernetes (ELSA-2021-9546)	Nessus	Oracle Linux Local Security Checks	high
154970	Oracle Linux 7 : olcne (ELSA-2021-9526)	Nessus	Oracle Linux Local Security Checks	high
153927	Photon OS 4.0: Kubernetes PHSA-2021-4.0-0112	Nessus	PhotonOS Local Security Checks	high
153834	RHEL 7 / 8 : OpenShift Container Platform 4.8.13 (RHSA-2021:3631)	Nessus	Red Hat Local Security Checks	high
153833	RHEL 7 : OpenShift Container Platform 3.11.524 (RHSA-2021:3646)	Nessus	Red Hat Local Security Checks	high
153756	Photon OS 2.0: Kubernetes PHSA-2021-2.0-0394	Nessus	PhotonOS Local Security Checks	high
153753	Photon OS 3.0: Kubernetes PHSA-2021-3.0-0303	Nessus	PhotonOS Local Security Checks	high
153690	Photon OS 1.0: Kubernetes PHSA-2021-1.0-0435	Nessus	PhotonOS Local Security Checks	high

Detections

Analytics

CVE-2021-25741

high

Tenable Plugins

high

high

high

high

high

high

high

high

high

high