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Ubuntu Security Notice USN-3983-1

Ubuntu Security Notice USN-3983-1
Posted May 15, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3983-1 - Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Giorgi Maisuradze, Dan Horea Lutas, Andrei Lutas, Volodymyr Pikhur, Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Moritz Lipp, Michael Schwarz, and Daniel Gruss discovered that memory previously stored in microarchitectural fill buffers of an Intel CPU core may be exposed to a malicious process that is executing on the same CPU core. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, local
systems | linux, ubuntu
advisories | CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2019-11091
MD5 | 8d2bae2374faf88e255173c33f6b5f2d

Ubuntu Security Notice USN-3983-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3983-1
May 14, 2019

linux vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel

Details:

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Giorgi Maisuradze, Dan
Horea Lutas, Andrei Lutas, Volodymyr Pikhur, Stephan van Schaik, Alyssa
Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos,
Cristiano Giuffrida, Moritz Lipp, Michael Schwarz, and Daniel Gruss
discovered that memory previously stored in microarchitectural fill buffers
of an Intel CPU core may be exposed to a malicious process that is
executing on the same CPU core. A local attacker could use this to expose
sensitive information. (CVE-2018-12130)

Brandon Falk, Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Stephan
van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo, Kaveh
Razavi, Herbert Bos, and Cristiano Giuffrida discovered that memory
previously stored in microarchitectural load ports of an Intel CPU core may
be exposed to a malicious process that is executing on the same CPU core. A
local attacker could use this to expose sensitive information.
(CVE-2018-12127)

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Marina Minkin, Daniel
Moghimi, Moritz Lipp, Michael Schwarz, Jo Van Bulck, Daniel Genkin, Daniel
Gruss, Berk Sunar, Frank Piessens, and Yuval Yarom discovered that memory
previously stored in microarchitectural store buffers of an Intel CPU core
may be exposed to a malicious process that is executing on the same CPU
core. A local attacker could use this to expose sensitive information.
(CVE-2018-12126)

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Volodrmyr Pikhur,
Moritz Lipp, Michael Schwarz, Daniel Gruss, Stephan van Schaik, Alyssa
Milburn, Sebastian Österlund, Pietro Frigo, Kaveh Razavi, Herbert Bos, and
Cristiano Giuffrida discovered that uncacheable memory previously stored in
microarchitectural buffers of an Intel CPU core may be exposed to a
malicious process that is executing on the same CPU core. A local attacker
could use this to expose sensitive information. (CVE-2019-11091)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 ESM:
linux-image-3.13.0-170-generic 3.13.0-170.220
linux-image-3.13.0-170-generic-lpae 3.13.0-170.220
linux-image-3.13.0-170-lowlatency 3.13.0-170.220
linux-image-3.13.0-170-powerpc-e500 3.13.0-170.220
linux-image-3.13.0-170-powerpc-e500mc 3.13.0-170.220
linux-image-3.13.0-170-powerpc-smp 3.13.0-170.220
linux-image-3.13.0-170-powerpc64-emb 3.13.0-170.220
linux-image-3.13.0-170-powerpc64-smp 3.13.0-170.220
linux-image-generic 3.13.0.170.181
linux-image-generic-lpae 3.13.0.170.181
linux-image-lowlatency 3.13.0.170.181
linux-image-powerpc-e500 3.13.0.170.181
linux-image-powerpc-e500mc 3.13.0.170.181
linux-image-powerpc-smp 3.13.0.170.181
linux-image-powerpc64-emb 3.13.0.170.181
linux-image-powerpc64-smp 3.13.0.170.181
linux-image-virtual 3.13.0.170.181

After a standard system update you need to reboot your computer to make
all the necessary changes.

Please note that fully mitigating the Microarchitectural Data Sampling
(MDS) issues (CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, and
CVE-2019-11091) requires corresponding processor microcode/firmware
updates or, in virtual environments, hypervisor updates.

References:
https://usn.ubuntu.com/usn/usn-3983-1
CVE-2018-12126, CVE-2018-12127, CVE-2018-12130, CVE-2019-11091,
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/MDS

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