Security Bulletin
Summary
IBM Cloud Kubernetes Service is affected by security vulnerabilities in the net/http library of the Go language that affects all Kubernetes components. These vulnerabilities can result in a denial-of-service attack against a process with an HTTP or HTTPS listener (CVE-2019-9512 and CVE-2019-9514).
Vulnerability Details
CVE-ID: CVE-2019-9512
Description: Multiple vendors are vulnerable to a denial of service, caused by a Ping Flood attack. By sending continual pings to an HTTP/2 peer, a remote attacker could consume excessive CPU resources.
CVSS Base Score: 7.5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/164903 for more information
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVE-ID: CVE-2019-9514
Description: Multiple vendors are vulnerable to a denial of service, caused by a Reset Flood attack. By opening a number of streams and sending an invalid request over each stream, a remote attacker could consume excessive CPU resources.
CVSS Base Score: 7.5
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/164640 for more information
CVSS Environmental Score*: Undefined
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
IBM Cloud Kubernetes Service 1.14.0-1.14.5
IBM Cloud Kubernetes Service 1.13.0-1.13.9
IBM Cloud Kubernetes Service 1.5-1.12
Remediation/Fixes
Updates for IBM Cloud Kubernetes Service clusters at versions 1.13 and later are available that fix these vulnerabilities. IBM Cloud Kubernetes Service will attempt to automatically update your cluster master. However, in some situations, the update may not complete. In addition, you must update cluster worker nodes created before the fix was available to address these vulnerabilities.
To verify your clusters are no longer exposed, use the following IBM Cloud CLI commands to confirm the currently running versions:
ibmcloud ks clusters
ibmcloud ks workers --cluster <cluster name or ID>
If your cluster versions are at one of the following levels or later, your clusters are no longer exposed to these vulnerabilities:
If one or more of your clusters is at version 1.13, 1.14 or 1.15 and has not had its master automatically updated then use the following IBM Cloud CLI command to complete the cluster master update, replacing "1.##" with the target version.
ibmcloud ks cluster-update --cluster <cluster name or ID> --kube-version 1.##
Once your clusters have completed their master updates, see Updating worker nodes for details on updating worker nodes still exposed to these vulnerabilities.
Customers running IBM Cloud Kubernetes Service clusters at versions 1.11 or 1.12 must upgrade their affected clusters to version 1.13. Customers running IBM Cloud Kubernetes Service clusters at version 1.10 must upgrade first to version 1.12 and then to version 1.13. Please review the documentation before starting an upgrade since additional actions may be required.
If you are running IBM Cloud Kubernetes Service clusters at version 1.5, 1.7, 1.8 or 1.9, there is no migration path.
Note: IBM Cloud Kubernetes Service versions 1.5, 1.7, 1.8, 1.9, 1.10 and 1.11 are no longer supported, and version 1.12 is deprecated. See the IBM Cloud Kubernetes Service Version information and update actions documentation for more information about Kubernetes versions and version support policies.
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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:
04 September 2019
UID
ibm11072380