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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0679 IBM Security Bulletin: IBM Cloud Kubernetes Service is affected by a privilege escalation vulnerability in runc 5 March 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM Cloud Kubernetes Service Publisher: IBM Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Root Compromise -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-5736 Reference: ESB-2019.0642 ESB-2019.0606 ESB-2019.0488.2 ESB-2019.0466 ESB-2019.0458 Original Bulletin: http://www.ibm.com/support/docview.wss?uid=ibm10871600 - --------------------------BEGIN INCLUDED TEXT-------------------- IBM Cloud Kubernetes Service is affected by a privilege escalation vulnerability in runc Product: IBM Cloud Kubernetes Service Component: -- Software version: All Versions Operating system(s): Platform Independent Reference #: 0871600 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 CVE-ID: CVE-2019-5736 Description: Runc could allow a local attacker to execute arbitrary commands on the system, cause by the improper handling of system file descriptors when running containers. An attacker could exploit this vulnerability using a malicious container to overwrite the contents of the host runc binary and execute arbitrary commands with root privileges on the 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. Authenticated users on all versions that are authorized to run a process as root (UID 0) inside a container can exploit the vulnerability in runc. This can be done by running a container with a malicious image, or by any other means by which commands can be executed in a container, for example, kubectl exec . This exploit enables a malicious user to gain root privileges on the host running the container. Containers that cannot run processes as root are not exploitable. 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> If the Kubernetes version is at one of the following patch levels or later the cluster worker node update has completed successfully: 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. Reference Complete CVSS v3 Guide On-line Calculator v3 Runc and CVE-2019-5736 Related Information IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog *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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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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