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Red Hat Security Advisory 2018-2060-01

Red Hat Security Advisory 2018-2060-01
Posted Jun 27, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-2060-01 - 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. Issues addressed include a bypass vulnerability.

tags | advisory, bypass
systems | linux, redhat
advisories | CVE-2018-3639
MD5 | 77df0b2da0596d232645bd25da62d51d

Red Hat Security Advisory 2018-2060-01

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

Synopsis: Important: qemu-kvm-rhev security and bug fix update
Advisory ID: RHSA-2018:2060-01
Product: Red Hat Virtualization
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2060
Issue date: 2018-06-27
CVE Names: CVE-2018-3639
=====================================================================

1. Summary:

An update for qemu-kvm-rhev 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.

2. Relevant releases/architectures:

Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts - ppc64le, 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)

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.

Bug Fix(es):

* Previously, using device passthrough for a SCSI-2 device failed and
returned an "Illegal Request" error. With this update, the QEMU emulator
checks the SCSI version of the device when performing passthrough. As a
result, the described problem no longer occurs. (BZ#1571370)

* Under certain circumstances, resuming a paused guest generated redundant
"VIR_DOMAIN_PAUSED_UNKNOWN" error messages in the libvirt log. This update
corrects the event sending order when resuming guests, which prevents the
errors being logged. (BZ#1582122)

Enhancement(s):

* With this update, Ceph storage is supported by KVM virtualization on all
CPU architectures supported by Red Hat. (BZ#1588001)

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

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

1566890 - CVE-2018-3639 hw: cpu: speculative store bypass
1582122 - IOERROR pause code lost after resuming a VM while I/O error is still present [rhel-7.5.z]
1588001 - Enable Native Ceph support on non x86_64 CPUs [rhel-7.5.z]

6. Package List:

Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts:

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

ppc64le:
qemu-img-rhev-2.10.0-21.el7_5.4.ppc64le.rpm
qemu-kvm-common-rhev-2.10.0-21.el7_5.4.ppc64le.rpm
qemu-kvm-rhev-2.10.0-21.el7_5.4.ppc64le.rpm
qemu-kvm-rhev-debuginfo-2.10.0-21.el7_5.4.ppc64le.rpm
qemu-kvm-tools-rhev-2.10.0-21.el7_5.4.ppc64le.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
https://access.redhat.com/security/vulnerabilities/ssbd

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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