Alerts This Week
Warning Icon 1 646
Alerts This Week
Warning Icon 1 646

Red Hat Enterprise Linux 6: RHSA-2018-1660-01 Important: KVM Cache Attack

Calendar May 21, 2018 • User Avatar LinuxSecurity Advisories
3 - 6 min read
Redhat Large Esm H500
Topics%20covered

Topics Covered

security advisory security update Red Hat KVM medium threat cache attack
An update for qemu-kvm is now available for Red Hat Enterprise Linux 6. 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 
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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

Synopsis:          Important: qemu-kvm security update
Advisory ID:       RHSA-2018:1660-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:1660
Issue date:        2018-05-21
CVE Names:         CVE-2018-3639 
====================================================================
1. Summary:

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.

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 Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, 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.

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 Desktop (v. 6):

Source:
qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.i686.rpm

ppc64:
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.ppc64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.ppc64.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.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 . More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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4FRp
-----END PGP SIGNATURE-----

--
RHSA-announce mailing list
This email address is being protected from spambots. You need JavaScript enabled to view it.

Red Hat Enterprise Linux 6: RHSA-2018-1660-01 Important: KVM Cache Attack

red hat
Calendar Grey May 21, 2018
Dist Redhat Esm H88
A crucial qemu-kvm patch has been released for Red Hat Enterprise Linux 6 that resolves major security vulnerabilities.
An update for qemu-kvm is now available for Red Hat Enterprise Linux 6

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.

Summary

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

Topics%20covered

Topics Covered

security advisory security update Red Hat KVM medium threat cache attack

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

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm
i386: qemu-guest-agent-0.12.1.2-2.503.el6_9.6.i686.rpm qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.i686.rpm
x86_64: qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm
x86_64: qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-kvm-tools-0.12.1.2-2.503.el6_9.6.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source: qemu-kvm-0.12.1.2-2.503.el6_9.6.src.rpm
i386: qemu-guest-agent-0.12.1.2-2.503.el6_9.6.i686.rpm qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.i686.rpm
ppc64: qemu-guest-agent-0.12.1.2-2.503.el6_9.6.ppc64.rpm qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.ppc64.rpm
x86_64: qemu-guest-agent-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-img-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-kvm-0.12.1.2-2.503.el6_9.6.x86_64.rpm qemu-kvm-debuginfo-0.12.1.2-2.503.el6_9.6.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:1660-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1660
Issue date: 2018-05-21

Topic

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security update Red Hat KVM medium threat cache attack

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Bugs Fixed

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

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here