Security Bulletin: IBM Cloud Kubernetes Service is affected by a Kubernetes kubelet security vulnerability (CVE-2020-8551)

Summary

IBM Cloud Kubernetes Service is affected by a security vulnerability in the Kubernetes kubelet that could lead to a denial of service (CVE-2020-8551)

Vulnerability Details

CVEID: CVE-2020-8551 DESCRIPTION: Kubernetes kubelet API is vulnerable to a denial of service, caused by improper input validation. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause a denial of service condition.
CVSS Base Score: 4.3
CVSS Temporal Score: <https://exchange.xforce.ibmcloud.com/vulnerabilities/178253&gt; for more information
CVSS Vector: (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

IBM Cloud Kubernetes Service 1.18.0
IBM Cloud Kubernetes Service 1.17.0-1.17.4
IBM Cloud Kubernetes Service 1.16.0-1.16.8
IBM Cloud Kubernetes Service 1.15.0-1.15.11
IBM Cloud Kubernetes Service 1.5-1.14

Remediation/Fixes

Updates for IBM Cloud Kubernetes Service cluster worker nodes at versions 1.15 and 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 ks 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:

1.15.10
1.16.7
1.17.3

IBM Cloud Kubernetes Service versions 1.14 and earlier are not impacted by this vulnerability.

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References

Complete CVSS v3 Guide
On-line Calculator v3

Off

Kubernetes Security Announcement for CVE-2020-8551

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

DD MMM 2019: Original version published

*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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