Security Bulletin: Red Hat OpenShift on IBM Cloud is affected by a cri-o/runc security vulnerability (CVE-2021-30465)

Security Bulletin

Summary

Red Hat OpenShift on IBM Cloud is affected by a security vulnerability found in cri-o/runc that could allow certain container configuration requests to actually result in the host filesystem being bind-mounted into the container (allowing for a container escape) (CVE-2021-30465).

Vulnerability Details

CVEID: CVE-2021-30465
Description: Open Container Initiative runc could allow a remote authenticated attacker to bypass security restrictions, caused by a symlink exchange attack. By sending a specially-crafted request, an attacker could exploit this vulnerability to allow host filesystem being bind-mounted into the container.
CVSS Base Score: 7.6
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/202132 for more information
CVSS Vector: (CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N)

Affected Products and Versions

Red Hat OpenShift on IBM Cloud 4.6-4.6.29_1544
Red Hat OpenShift on IBM Cloud 4.5-4.5.39_1540
Red Hat OpenShift on IBM Cloud 3.11-4.4

Remediation/Fixes

Updates for Red Hat OpenShift on IBM Cloud cluster worker nodes at versions 4.5 or later are available that fix this vulnerability. Customers must update worker nodes created before the fix was available to address the vulnerability. See updating worker nodes for details on updating worker nodes. To verify your cluster worker nodes have been updated, use the following IBM Cloud CLI command to confirm the currently running versions:

ibmcloud oc workers --cluster <cluster name or ID>

If the versions are at one of the following patch levels or later, the cluster worker nodes have the fix:

4.7.13_1521
4.6.31_1545
4.5.40_1541

Customers running Red Hat OpenShift on IBM Cloud Service clusters at version 4.4 must upgrade to version 4.5. Please review the documentation before starting an upgrade since additional actions may be required.

Customers running Red Hat OpenShift on IBM Cloud Service clusters at version 3.11 or 4.3 must create a new cluster and deploy their apps to the new cluster.

Red Hat OpenShift on IBM Cloud Service 4.4 and earlier are no longer supported, and versions 3.11 and 4.5 are deprecated. See the Red Hat OpenShift on IBM Cloud Service version information and update actions documentation for more information about Kubernetes versions and version support policies.

Monitor IBM Cloud Status for Future Security Bulletins

Monitor the security notifications on the IBM Cloud Status page to be advised of future security bulletins.

References

Complete CVSS v3 Guide
On-line Calculator v3

Off

Security advisory for runc

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

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Tips

Security Bulletin: Red Hat OpenShift on IBM Cloud is affected by a cri-o/runc security vulnerability (CVE-2021-30465)