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Red Hat Security Advisory 2018-2363-01

Red Hat Security Advisory 2018-2363-01
Posted Aug 7, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-2363-01 - KVM is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm-rhev packages provide the user-space component for running virtual machines that use KVM in environments managed by Red Hat products. Security fix: An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions. 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. As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. Issues addressed include a bypass vulnerability.

tags | advisory, bypass
systems | linux, redhat
advisories | CVE-2018-3639
SHA-256 | 1731d8429d900bc059978895ccfc58bfea9c4a138abd0aea7e54f8eef5c602b4

Red Hat Security Advisory 2018-2363-01

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=====================================================================
Red Hat Security Advisory

Synopsis: Important: qemu-kvm-rhev security update
Advisory ID: RHSA-2018:2363-01
Product: Red Hat Enterprise Linux OpenStack Platform
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2363
Issue date: 2018-08-07
CVE Names: CVE-2018-3639
=====================================================================

1. Summary:

An update for qemu-kvm-rhev is now available for Red Hat OpenStack Platform
9.

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 OpenStack Platform 9.0 - x86_64

3. Description:

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

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)

Acknowledgements:

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

Note: This is the qemu-kvm-rhev side of the CVE-2018-3639 mitigation that
includes support for guests running on hosts with AMD processors.

For more details about the security issue(s), including the impact, a CVSS
score, 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

5. Bugs fixed (https://bugzilla.redhat.com/):

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

6. Package List:

Red Hat OpenStack Platform 9.0:

Source:
qemu-kvm-rhev-2.10.0-21.el7_5.4.src.rpm

x86_64:
qemu-img-rhev-2.10.0-21.el7_5.4.x86_64.rpm
qemu-kvm-common-rhev-2.10.0-21.el7_5.4.x86_64.rpm
qemu-kvm-rhev-2.10.0-21.el7_5.4.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.10.0-21.el7_5.4.x86_64.rpm
qemu-kvm-tools-rhev-2.10.0-21.el7_5.4.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-2018-3639
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2018 Red Hat, Inc.
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