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Red Hat Enterprise Linux 6.6 RHSA-2018:2309-01 Critical: Cache Side-Channel

Calendar Jul 31, 2018 • User Avatar LinuxSecurity Advisories
3 - 6 min read
Redhat Large Esm H500
Topics%20covered

Topics Covered

security advisory red hat important kernel cache attack speculative execution
An update for kernel is now available for Red Hat Enterprise Linux 6.6 Advanced Update Support and Red Hat Enterprise Linux 6.6 Telco Extended Update Support. Red Hat Product Security has rated this update as having a security impact 
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====================================================================                   Red Hat Security Advisory

Synopsis:          Important: kernel security update
Advisory ID:       RHSA-2018:2309-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:2309
Issue date:        2018-07-31
CVE Names:         CVE-2018-3639 
====================================================================
1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.6
Advanced Update Support and Red Hat Enterprise Linux 6.6 Telco Extended
Update Support.

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 Server AUS (v. 6.6) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.6) - x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 6.6) - x86_64
Red Hat Enterprise Linux Server TUS (v. 6.6) - noarch, x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

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, x86 AMD)

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

The system must be rebooted 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 Server AUS (v. 6.6):

Source:
kernel-2.6.32-504.72.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-504.72.1.el6.noarch.rpm
kernel-doc-2.6.32-504.72.1.el6.noarch.rpm
kernel-firmware-2.6.32-504.72.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debug-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-504.72.1.el6.x86_64.rpm
kernel-devel-2.6.32-504.72.1.el6.x86_64.rpm
kernel-headers-2.6.32-504.72.1.el6.x86_64.rpm
perf-2.6.32-504.72.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server TUS (v. 6.6):

Source:
kernel-2.6.32-504.72.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-504.72.1.el6.noarch.rpm
kernel-doc-2.6.32-504.72.1.el6.noarch.rpm
kernel-firmware-2.6.32-504.72.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debug-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-504.72.1.el6.x86_64.rpm
kernel-devel-2.6.32-504.72.1.el6.x86_64.rpm
kernel-headers-2.6.32-504.72.1.el6.x86_64.rpm
perf-2.6.32-504.72.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.6):

x86_64:
kernel-debug-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-504.72.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
python-perf-2.6.32-504.72.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional TUS (v. 6.6):

x86_64:
kernel-debug-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-504.72.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
python-perf-2.6.32-504.72.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-504.72.1.el6.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.
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Red Hat Enterprise Linux 6.6 RHSA-2018:2309-01 Critical: Cache Side-Channel

red hat
Calendar Grey July 31, 2018
Dist Redhat Esm H88
Critical kernel security update for Red Hat Enterprise Linux 6.6 addressing cache side-channel vulnerabilities.
An update for kernel is now available for Red Hat Enterprise Linux 6.6 Advanced Update Support and Red Hat Enterprise Linux 6.6 Telco Extended Update Support

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

The system must be rebooted for this update to take effect.

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.
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, x86 AMD)
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 red hat important kernel cache attack speculative execution

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 Server AUS (v. 6.6):
Source: kernel-2.6.32-504.72.1.el6.src.rpm
noarch: kernel-abi-whitelists-2.6.32-504.72.1.el6.noarch.rpm kernel-doc-2.6.32-504.72.1.el6.noarch.rpm kernel-firmware-2.6.32-504.72.1.el6.noarch.rpm
x86_64: kernel-2.6.32-504.72.1.el6.x86_64.rpm kernel-debug-2.6.32-504.72.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-504.72.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-504.72.1.el6.x86_64.rpm kernel-devel-2.6.32-504.72.1.el6.x86_64.rpm kernel-headers-2.6.32-504.72.1.el6.x86_64.rpm perf-2.6.32-504.72.1.el6.x86_64.rpm perf-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm python-perf-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm
Red Hat Enterprise Linux Server TUS (v. 6.6):
Source: kernel-2.6.32-504.72.1.el6.src.rpm
noarch: kernel-abi-whitelists-2.6.32-504.72.1.el6.noarch.rpm kernel-doc-2.6.32-504.72.1.el6.noarch.rpm kernel-firmware-2.6.32-504.72.1.el6.noarch.rpm
x86_64: kernel-2.6.32-504.72.1.el6.x86_64.rpm kernel-debug-2.6.32-504.72.1.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm kernel-debug-devel-2.6.32-504.72.1.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.72.1.el6.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:2309-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2309
Issue date: 2018-07-31

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.6Advanced Update Support and Red Hat Enterprise Linux 6.6 Telco ExtendedUpdate Support.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 red hat important kernel cache attack speculative execution

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 6.6) - noarch, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 6.6) - x86_64

Red Hat Enterprise Linux Server Optional TUS (v. 6.6) - x86_64

Red Hat Enterprise Linux Server TUS (v. 6.6) - noarch, x86_64

Bugs Fixed

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

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