RedHat: RHSA-2019-3916:01 Important: OpenShift Container Platform 4.2.5

    Date19 Nov 2019
    CategoryRed Hat
    296
    Posted ByLinuxSecurity Advisories
    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,
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    =====================================================================
                       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 . More contact
    details at https://access.redhat.com/security/team/contact/
    
    Copyright 2019 Red Hat, Inc.
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