Security Bulletin: IBM Cloud Kubernetes Service is affected by a privilege escalation vulnerability in runc
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.
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.
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>
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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*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.
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
More support for:
IBM Cloud Kubernetes Service
Software version: All Versions
Operating system(s): Platform Independent
Reference #: 0871600
Modified date: 18 February 2019