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Red Hat Product Errata RHSA-2019:1195 - Security Advisory
Issued:
2019-05-14
Updated:
2019-05-14

RHSA-2019:1195 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: qemu-kvm security update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.6 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.

Description

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.

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.

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 this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Affected Products

  • Red Hat Enterprise Linux Server - AUS 6.6 x86_64

Fixes

  • BZ - 1646781 - CVE-2018-12126 hardware: Microarchitectural Store Buffer Data Sampling (MSBDS)
  • BZ - 1646784 - CVE-2018-12130 hardware: Microarchitectural Fill Buffer Data Sampling (MFBDS)
  • BZ - 1667782 - CVE-2018-12127 hardware: Micro-architectural Load Port Data Sampling - Information Leak (MLPDS)
  • BZ - 1705312 - CVE-2019-11091 hardware: Microarchitectural Data Sampling Uncacheable Memory (MDSUM)

CVEs

  • CVE-2018-12126
  • CVE-2018-12127
  • CVE-2018-12130
  • CVE-2019-11091

References

  • https://access.redhat.com/security/updates/classification/#important
  • https://access.redhat.com/security/vulnerabilities/mds
  • Note: More recent versions of these packages may be available. Click a package name for more details.

    Red Hat Enterprise Linux Server - AUS 6.6

    SRPM
    qemu-kvm-0.12.1.2-2.448.el6_6.8.src.rpm SHA-256: 63ae80e4e900293a3980c9f3d752ddf8021849dcfde9c2d5c029202bab44ed8f
    x86_64
    qemu-guest-agent-0.12.1.2-2.448.el6_6.8.x86_64.rpm SHA-256: 163e4a74a79d2c3276aaa88d4f19af0bfe90a7e96a09e49d993530e8f9194db8
    qemu-img-0.12.1.2-2.448.el6_6.8.x86_64.rpm SHA-256: 54652477047e5c67112bb094b5a1a77f0b48f5a3628c63a1f5b5cbf63d525f60
    qemu-kvm-0.12.1.2-2.448.el6_6.8.x86_64.rpm SHA-256: 27460d56679223369ecd7affe8cc0831c4ff8b7c0d84285baeb91b40abd057ce
    qemu-kvm-debuginfo-0.12.1.2-2.448.el6_6.8.x86_64.rpm SHA-256: 78961c5667246ef5803f7df673224a9b38131eb507e6b5040a45f29bc81b41b9
    qemu-kvm-tools-0.12.1.2-2.448.el6_6.8.x86_64.rpm SHA-256: ebc86834c3433c7fcdc7c32c634132b5106668dd71bea687b6f5dbd3160bf98a

    The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.

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