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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix for microcode_ctl) Intel CPU Data Cache Race Conditions Let Local Users Read Arbitrary Virtual CPU Memory
SecurityTracker Alert ID:  1040101
SecurityTracker URL:  http://securitytracker.com/id/1040101
CVE Reference:   CVE-2017-5715   (Links to External Site)
Date:  Jan 4 2018
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 6, 6.2, 6.4, 6.6, 6.7, 7, 7.2, 7.3
Description:   Several vulnerabilities were reported in Intel CPU. A local user can read arbitrary virtual memory on the target CPU device. microcode_ctl is affected.

A local user can exploit race conditions in CPU data cache processing to obtain potentially sensitive information on the target system. This can be exploited to read arbitrary virtual memory on the target system, including by a local user on a guest operating system of a virtual machine to read arbitrary memory from other guest systems, the host operating system, and the hypervisor.

In certain cases, a local user can run a specially crafted application to exploit several flaws in the CPU speculative branch instruction execution feature and leverage CPU data cache timing behavior to infer information or read information from various CPU caches.

A local user that can trigger an out-of-bounds index error in an application can read data from another process from the CPU virtual memory [CVE-2017-5753]. The eBPF interpreter or the eBPF JIT engine can be used to create vulnerable code.

A local user can run specially crafted code to cause the CPU to speculatively execute an indirect branch to leak memory contents from another process into a CPU cache and then read the contents of the cache [CVE-2017-5715].

A local user can run specially crafted code to cause the CPU to read memory from a CPU cache before an asynchronous permission check occurs [CVE-2017-5754]. AMD CPUs are reportedly not affected.

The Intel Core, Xeon, Atom, Celeron, and Pentium product lines are affected.

CPUs from AMD and ARM are also affected.

CPUs from other vendors may also affected.

The CVE-2017-5753 and CVE-2017-5715 vulnerabilities are referred to as "Spectre".

The CVE-2017-5754 vulnerability is referred to as "Meltdown".

The original advisories are available at:

https://spectreattack.com/spectre.pdf
https://meltdownattack.com/meltdown.pdf
https://googleprojectzero.blogspot.com/2018/01/reading-privileged-memory-with-side.html

Paul Kocher, Daniel Genkin, Daniel Gruss, Werner Haas, Mike Hamburg, Moritz Lipp, Stefan Mangard, Thomas Prescher, Michael Schwarz, Yuval Yarom, Anders Fogh, Jann Horn, the Google Project Zero Team, and others reported these vulnerabilities.

Impact:   A local user can view arbitrary virtual memory contents on the target CPU device [which can lead to elevated privileges on the target system].
Solution:   Red Hat has issued a fix for CVE-2017-5715 for microcode_ctl.

The Red Hat advisories are available at:

https://access.redhat.com/errata/RHSA-2018:0012
https://access.redhat.com/errata/RHSA-2018:0013
https://access.redhat.com/errata/RHSA-2018:0034
https://access.redhat.com/errata/RHSA-2018:0035
https://access.redhat.com/errata/RHSA-2018:0036
https://access.redhat.com/errata/RHSA-2018:0037
https://access.redhat.com/errata/RHSA-2018:0038

Vendor URL:  access.redhat.com/errata/RHSA-2018:0012 (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Jan 4 2018 Intel/AMD/ARM CPU Data Cache Race Conditions Let Local Users Read Arbitrary Virtual CPU Memory



 Source Message Contents

Subject:  [RHSA-2018:0012-01] Important: microcode_ctl security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: microcode_ctl security update
Advisory ID:       RHSA-2018:0012-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:0012
Issue date:        2018-01-03
=====================================================================

1. Summary:

An update for microcode_ctl 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 (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

The microcode_ctl packages provide microcode updates for Intel and AMD
processors.

Security Fix(es):

* An industry-wide issue was found in the way many modern microprocessor
designs have implemented speculative execution of instructions (a commonly
used performance optimization). There are three primary variants of the
issue which differ in the way the speculative execution can be exploited.
Variant CVE-2017-5715 triggers the speculative execution by utilizing
branch target injection. It relies on the presence of a precisely-defined
instruction sequence in the privileged code as well as the fact that memory
accesses may cause allocation 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 cross the syscall
and guest/host boundaries and read privileged memory by conducting targeted
cache side-channel attacks. (CVE-2017-5715)

Note: This is the microcode counterpart of the CVE-2017-5715 kernel
mitigation.

Red Hat would like to thank 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

Note: a system reboot is necessary for this update to take effect.

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

1519780 - CVE-2017-5715 hw: cpu: speculative execution branch target injection

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
microcode_ctl-2.1-22.2.el7.src.rpm

x86_64:
microcode_ctl-2.1-22.2.el7.x86_64.rpm
microcode_ctl-debuginfo-2.1-22.2.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
microcode_ctl-2.1-22.2.el7.src.rpm

x86_64:
microcode_ctl-2.1-22.2.el7.x86_64.rpm
microcode_ctl-debuginfo-2.1-22.2.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
microcode_ctl-2.1-22.2.el7.src.rpm

x86_64:
microcode_ctl-2.1-22.2.el7.x86_64.rpm
microcode_ctl-debuginfo-2.1-22.2.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
microcode_ctl-2.1-22.2.el7.src.rpm

x86_64:
microcode_ctl-2.1-22.2.el7.x86_64.rpm
microcode_ctl-debuginfo-2.1-22.2.el7.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/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/speculativeexecution
https://access.redhat.com/security/cve/CVE-2017-5715

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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