20 November 2019
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4386 OpenShift Container Platform 4.2.5 machine-os-content-container security update 20 November 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: OpenShift Container Platform 4.2.5 Publisher: Red Hat Operating System: Red Hat Impact/Access: Root Compromise -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-14287 CVE-2018-12207 Reference: ESB-2019.4359 ESB-2019.4339 ESB-2019.4301 ESB-2019.4288 ESB-2019.4286 Original Bulletin: https://access.redhat.com/errata/RHSA-2019:3916 - --------------------------BEGIN INCLUDED TEXT-------------------- ====================================================================== Red Hat Security Advisory Synopsis: Important: OpenShift Container Platform 4.2.5 machine-os-content-container security update Advisory ID: RHSA-2019:3916-01 Product: Red Hat OpenShift Enterprise Advisory URL: https://access.redhat.com/errata/RHSA-2019:3916 Issue date: 2019-11-19 CVE Names: CVE-2018-12207 CVE-2019-14287 ====================================================================== 1. Summary: An update for machine-os-content-container is now available for Red Hat OpenShift Container Platform 4.2. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Description: Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This is a text-only advisory for the machine-os-content container image, which includes RPM packages for Red Hat Enterprise Linux CoreOS. Security Fix(es): * A flaw was found in the way Intel CPUs handled inconsistency between virtual to physical memory address translations in the CPU's local cache and the system software's Paging structure entries. A privileged guest user can exploit this flaw to induce a hardware Machine Check Error (MCE) on the host processor, resulting in a severe DoS scenario by halting the processor. System software like the OS OR Virtual Machine Monitor (VMM) use the virtual memory system for storing program instructions and data in memory. The virtual memory system uses Paging structures like Page Tables and Page Directories to manage system memory. The processor's Memory Management Unit (MMU) uses Paging structure entries to translate a program's virtual memory addresses to physical memory addresses. The processor stores these address translations into its local cache buffer, called the Translation Lookaside Buffer (TLB). TLB has two parts, one for instructions and the other for data addresses. System software can modify its Paging structure entries to change address mappings or certain attributes like page size, etc. Upon such Paging structure alterations in memory, system software must invalidate the corresponding address translations in the processor's TLB cache. Before this TLB invalidation takes place, however, a privileged guest user could trigger an instruction fetch operation, which could use an already cached, but now invalid, virtual to physical address translation from Instruction TLB (ITLB). This would access an invalid physical memory address, resulting in halting the processor due to the MCE on Page Size Change. (CVE-2018-12207) * A flaw was found in the way sudo implemented running commands with an arbitrary user ID. If a sudoers entry is written to allow users to run a command as any user except root, this flaw can be used by an attacker to bypass that restriction. (CVE-2019-14287) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. 3. Solution: See the following documentation, which will be updated shortly for release 4.2.5, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.2/release_notes/ocp-4-2-rel ease-notes.html 4. Bugs fixed (https://bugzilla.redhat.com/): 1646768 - CVE-2018-12207 hw: Machine Check Error on Page Size Change (IFU) 1760531 - CVE-2019-14287 sudo: Privilege escalation via 'Runas' specification with 'ALL' keyword 5. References: https://access.redhat.com/security/cve/CVE-2018-12207 https://access.redhat.com/security/cve/CVE-2019-14287 https://access.redhat.com/security/vulnerabilities/ifu-page-mce https://access.redhat.com/security/updates/classification/#important 6. Contact: The Red Hat security contact is <email@example.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2019 Red Hat, Inc. - --------------------------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 firstname.lastname@example.org 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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