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Red Hat Product Errata RHSA-2018:1696 - Security Advisory
Issued:
2018-05-23
Updated:
2018-05-23

RHSA-2018:1696 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: redhat-virtualization-host security update

Type/Severity

Security Advisory: Important

Topic

An update for redhat-virtualization-host is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 7.

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

The ovirt-node-ng packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks.

Security Fix(es):

  • An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)

Note: This is the redhat-virtualization-host side of the CVE-2018-3639 mitigation.

Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting this issue.

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

Affected Products

  • Red Hat Virtualization Host 4 for RHEL 7 x86_64

Fixes

  • BZ - 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass

CVEs

  • CVE-2018-3639

References

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

    Red Hat Virtualization Host 4 for RHEL 7

    SRPM
    redhat-virtualization-host-4.2-20180518.2.el7_5.src.rpm SHA-256: bed1219fea976a801e7cc0144e744f0e0e181cb04a26d24ca7e2fc9df30cb725
    x86_64
    redhat-virtualization-host-image-update-4.2-20180518.2.el7_5.noarch.rpm SHA-256: d9032bf4cfb2257233a724698f8966ee9a89dc8635550579b0d5ca19beb2dab7

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

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