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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== 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 =========================================================================== 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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