Security Bulletin
Summary
Red Hat OpenShift on IBM Cloud is affected by a security vulnerability in the Kubernetes API server that could lead to a denial of service vulnerability from malicious YAML payloads (CVE-2019-11254)
Vulnerability Details
CVEID: CVE-2019-11254
Description: Kubernetes is vulnerable to a denial of service, caused by a flaw in kube-apiserver. By sending a specially-crafted request using YAML payloads, a remote authenticated attacker could exploit this vulnerability to consume excessive CPU cycles.
CVSS Base Score: 7.5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/178935 for more information
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Affected Products and Versions
Remediation/Fixes
Updates for Red Hat OpenShift on IBM Cloud clusters at version 3.11 are available that fix this vulnerability. Red Hat OpenShift on IBM Cloud service will attempt to automatically apply the fix to your cluster master. There is no need to update cluster worker nodes for this vulnerability.
To verify your clusters are no longer exposed to this vulnerability, use the following IBM Cloud CLI command to confirm your cluster master versions:
ibmcloud oc clusters
If your cluster masters are at version 3.11.232 or later, they are no longer exposed to this vulnerability:
If one or more of your clusters has not had its master automatically updated then use the following IBM Cloud CLI command to complete the cluster master update.
ibmcloud oc cluster master update --cluster <cluster name or ID> --version 3.11_openshift
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
*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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Document Information
Modified date:
21 July 2020
UID
ibm16249873