ESB-2019.1260 - [Appliance] IBM Cloud Kubernetes Service: Reduced security - Remote/unauthenticated 2019-04-12

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1260
          IBM Security Bulletin: IBM Cloud Kubernetes Service is
                 affected by a CNI security vulnerability
                               12 April 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM Cloud Kubernetes Service
Publisher:         IBM
Operating System:  Network Appliance
Impact/Access:     Reduced Security -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-9946  

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=ibm10879585

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IBM Cloud Kubernetes Service is affected by a CNI security vulnerability

Product:             IBM Cloud Kubernetes Service

Component:           --

Software version:    All Versions

Operating system(s): Platform Independent

Reference #:         0879585

Security Bulletin

Summary

IBM Cloud Kubernetes Service is affected by a CNI security vulnerability which
could result in weaker than expected security.

Vulnerability Details

CVE-ID: CVE-2019-9946
Description: Kubernetes could provide weaker than expected security, caused by
an interaction when paired with the embedded CNI (Container Networking
Interface) that uses the portmap plugin. The portmap plugin inserts rules at
the front of the iptables nat chains which would take precedence over the KUBE-
SERVICES chain. The HostPort/portmap rule allows for matching of incoming
traffic even if there are better fitting, more specific service definition
rules like NodePorts later in the chain.
CVSS Base Score: 5.3
CVSS Temporal Score: https://exchange.xforce.ibmcloud.com/vulnerabilities/
158803 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:L/A:N)

Affected Products and Versions

IBM Cloud Kubernetes Service 1.13.0-1.13.4
IBM Cloud Kubernetes Service 1.12.0-1.12.6
IBM Cloud Kubernetes Service 1.11.0-1.11.8
IBM Cloud Kubernetes Service 1.5-1.10


Remediation/Fixes

IBM Cloud Kubernetes Service clusters at versions 1.11 and later have been
updated to address this vulnerability. To resolve any existing exposure to this
vulnerability, you must reboot or update your worker nodes. See Updating worker
nodes for details on updating worker nodes. To verify your clusters have been
updated, 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 master and worker node versions are at one of the following levels or
later, you are no longer exposed to this vulnerability:

1.11.9
1.12.7
1.13.5

If one or more of your clusters is at version 1.11, 1.12 or 1.13 and has not
been automatically updated then use the following IBM Cloud CLI command to
complete the update, replacing "1.##" with the target version. After the update
is complete, you must also reboot or update your worker nodes. See Updating
worker nodes for details on updating worker nodes.

ibmcloud ks cluster-update --cluster <cluster name or ID> --kube-version 1.##

Customers running IBM Cloud Kubernetes Service clusters at version 1.10 must
update their affected clusters to version 1.11 or 1.12. Customers running IBM
Cloud Kubernetes Service clusters at version 1.7, 1.8 or 1.9 must update first
to version 1.10 and then to version 1.11 or 1.12. Please review the update
documentation for more information.

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, and version 1.10 is deprecated. See the IBM Cloud Kubernetes Service
Version information and update actions documentation for more information about
Kubernetes versions and version support policies.

Reference

Complete CVSS v3 Guide
On-line Calculator v3

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

https://discuss.kubernetes.io/t/
announce-security-release-of-kubernetes-affecting-certain-network-configurations-with-cni-releases-1-11-9-1-12-7-1-13-5-and-1-14-0-cve-2019-9946
/5713

Change History

9 April 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

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.

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