RedHat: RHSA-2019-1197:01 Important: libvirt security update

    Date14 May 2019
    CategoryRed Hat
    339
    Posted ByLinuxSecurity Advisories
    An update for libvirt is now available for Red Hat Enterprise Linux 6.5 Advanced Update Support. 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: libvirt security update
    Advisory ID:       RHSA-2019:1197-01
    Product:           Red Hat Enterprise Linux
    Advisory URL:      https://access.redhat.com/errata/RHSA-2019:1197
    Issue date:        2019-05-14
    CVE Names:         CVE-2018-12126 CVE-2018-12127 CVE-2018-12130 
                       CVE-2019-11091 
    =====================================================================
    
    1. Summary:
    
    An update for libvirt is now available for Red Hat Enterprise Linux 6.5
    Advanced Update Support.
    
    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. Relevant releases/architectures:
    
    Red Hat Enterprise Linux Server AUS (v. 6.5) - x86_64
    Red Hat Enterprise Linux Server Optional AUS (v. 6.5) - x86_64
    
    3. Description:
    
    The libvirt library contains a C API for managing and interacting with the
    virtualization capabilities of Linux and other operating systems. In
    addition, libvirt provides tools for remote management of virtualized
    systems.
    
    Security Fix(es):
    
    * A flaw was found in the implementation of the "fill buffer", a mechanism
    used by modern CPUs when a cache-miss is made on L1 CPU cache. If an
    attacker can generate a load operation that would create a page fault, the
    execution will continue speculatively with incorrect data from the fill
    buffer while the data is fetched from higher level caches. This response
    time can be measured to infer data in the fill buffer. (CVE-2018-12130)
    
    * Modern Intel microprocessors implement hardware-level micro-optimizations
    to improve the performance of writing data back to CPU caches. The write
    operation is split into STA (STore Address) and STD (STore Data)
    sub-operations. These sub-operations allow the processor to hand-off
    address generation logic into these sub-operations for optimized writes.
    Both of these sub-operations write to a shared distributed processor
    structure called the 'processor store buffer'. As a result, an unprivileged
    attacker could use this flaw to read private data resident within the CPU's
    processor store buffer. (CVE-2018-12126)
    
    * Microprocessors use a ‘load port’ subcomponent to perform load operations
    from memory or IO. During a load operation, the load port receives data
    from the memory or IO subsystem and then provides the data to the CPU
    registers and operations in the CPU’s pipelines. Stale load operations
    results are stored in the 'load port' table until overwritten by newer
    operations. Certain load-port operations triggered by an attacker can be
    used to reveal data about previous stale requests leaking data back to the
    attacker via a timing side-channel. (CVE-2018-12127)
    
    * Uncacheable memory on some microprocessors utilizing speculative
    execution may allow an authenticated user to potentially enable information
    disclosure via a side channel with local access. (CVE-2019-11091)
    
    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.
    
    4. Solution:
    
    For details on how to apply this update, which includes the changes
    described in this advisory, refer to:
    
    https://access.redhat.com/articles/11258
    
    After installing the updated packages, libvirtd will be restarted
    automatically.
    
    5. Bugs fixed (https://bugzilla.redhat.com/):
    
    1646781 - CVE-2018-12126 hardware: Microarchitectural Store Buffer Data Sampling (MSBDS)
    1646784 - CVE-2018-12130 hardware: Microarchitectural Fill Buffer Data Sampling (MFBDS)
    1667782 - CVE-2018-12127 hardware: Micro-architectural Load Port Data Sampling - Information Leak (MLPDS)
    1705312 - CVE-2019-11091 hardware: Microarchitectural Data Sampling Uncacheable Memory (MDSUM)
    
    6. Package List:
    
    Red Hat Enterprise Linux Server AUS (v. 6.5):
    
    Source:
    libvirt-0.10.2-29.el6_5.18.src.rpm
    
    x86_64:
    libvirt-0.10.2-29.el6_5.18.x86_64.rpm
    libvirt-client-0.10.2-29.el6_5.18.i686.rpm
    libvirt-client-0.10.2-29.el6_5.18.x86_64.rpm
    libvirt-debuginfo-0.10.2-29.el6_5.18.i686.rpm
    libvirt-debuginfo-0.10.2-29.el6_5.18.x86_64.rpm
    libvirt-devel-0.10.2-29.el6_5.18.i686.rpm
    libvirt-devel-0.10.2-29.el6_5.18.x86_64.rpm
    libvirt-python-0.10.2-29.el6_5.18.x86_64.rpm
    
    Red Hat Enterprise Linux Server Optional AUS (v. 6.5):
    
    Source:
    libvirt-0.10.2-29.el6_5.18.src.rpm
    
    x86_64:
    libvirt-debuginfo-0.10.2-29.el6_5.18.x86_64.rpm
    libvirt-lock-sanlock-0.10.2-29.el6_5.18.x86_64.rpm
    
    These packages are GPG signed by Red Hat for security.  Our key and
    details on how to verify the signature are available from
    https://access.redhat.com/security/team/key/
    
    7. References:
    
    https://access.redhat.com/security/cve/CVE-2018-12126
    https://access.redhat.com/security/cve/CVE-2018-12127
    https://access.redhat.com/security/cve/CVE-2018-12130
    https://access.redhat.com/security/cve/CVE-2019-11091
    https://access.redhat.com/security/vulnerabilities/mds
    https://access.redhat.com/security/updates/classification/#important
    
    8. 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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