Security Bulletin
Summary
IBM Cloud Kubernetes Service is affected by a security vulnerability in runc which could allow an attacker that is authorized to run a process as root inside a container to execute arbitrary commands with root privileges on the container’s host system.
Vulnerability Details
CVSS Base Score: 7.7
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/156819 for more information
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H)
Affected Products and Versions
All versions of IBM Cloud Kubernetes Service are impacted.
To help mitigate this vulnerability, you are highly encouraged to Configure pod security policies in your cluster to prevent container processes from running as root.
Remediation/Fixes
Updates for IBM Cloud Kubernetes Service cluster worker nodes at versions 1.10 and later are available that fix this vulnerability. Customers must update their worker nodes 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 version:
ibmcloud ks workers --cluster <cluster name or ID>
1.10.12_1544
1.11.7_1544
1.12.5_1538
1.13.2_1508
Customers running IBM Cloud Kubernetes Service clusters at versions 1.7, 1.8 or 1.9 must upgrade their affected clusters to version 1.10. See Updating clusters for details on upgrading the cluster master and worker nodes.
Customers running IBM Cloud Kubernetes Service clusters at version 1.5 must create a new cluster and migrate their apps to it.
Note: IBM Cloud Kubernetes Service versions 1.5, 1.7, 1.8 and 1.9 are no longer supported. 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:
18 February 2019
UID
ibm10871600