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AUSCERT External Security Bulletin Redistribution
ESB-2018.1862
Important: qemu-kvm security update
27 June 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: qemu-kvm
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
Red Hat Enterprise Linux WS/Desktop 7
Impact/Access: Access Privileged Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-3639
Reference: ASB-2018.0121
ESB-2018.1797
ESB-2018.1750
ESB-2018.1549
ESB-2018.1548.6
ESB-2018.1545
Original Bulletin:
https://access.redhat.com/errata/RHSA-2018:2001
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Red Hat Security Advisory
Synopsis: Important: qemu-kvm security update
Advisory ID: RHSA-2018:2001-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2001
Issue date: 2018-06-26
CVE Names: CVE-2018-3639
=====================================================================
1. Summary:
An update for qemu-kvm is now available 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 Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
3. 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):
* 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 qemu-kvm side of the CVE-2018-3639 mitigation that
includes support for guests running on hosts with AMD processors.
Red Hat would like to thank Ken Johnson (Microsoft Security Response
Center) and Jann Horn (Google Project Zero) for reporting this issue.
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
6. Package List:
Red Hat Enterprise Linux Client (v. 7):
Source:
qemu-kvm-1.5.3-156.el7_5.3.src.rpm
x86_64:
qemu-img-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-common-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-tools-1.5.3-156.el7_5.3.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
Source:
qemu-kvm-1.5.3-156.el7_5.3.src.rpm
x86_64:
qemu-img-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-common-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-tools-1.5.3-156.el7_5.3.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source:
qemu-kvm-1.5.3-156.el7_5.3.src.rpm
x86_64:
qemu-img-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-common-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-tools-1.5.3-156.el7_5.3.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source:
qemu-kvm-1.5.3-156.el7_5.3.src.rpm
x86_64:
qemu-img-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-common-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-156.el7_5.3.x86_64.rpm
qemu-kvm-tools-1.5.3-156.el7_5.3.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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