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             AUSCERT External Security Bulletin Redistribution

                              ESB-2019.1708.2
                    USN-3977-2: Intel Microcode update
                                23 May 2019

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           intel-microcode
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-11091 CVE-2018-12130 CVE-2018-12127
                   CVE-2018-12126  

Reference:         ASB-2019.0138
                   ESB-2019.1705

Original Bulletin: 
   https://usn.ubuntu.com/3977-1/

Revision History:  May 23 2019: Updated for Intel Cherry Trail and Bay Trail processor families
                   May 15 2019: Initial Release

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USN-3977-2: Intel Microcode update
22 May 2019

intel-microcode update
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 19.04
  o Ubuntu 18.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 ESM

Summary

The system could be made to expose sensitive information.

Software Description

  o intel-microcode - Processor microcode for Intel CPUs

Details

USN-3977-1 provided mitigations for Microarchitectural Data Sampling (MDS)
vulnerabilities in Intel Microcode for a large number of Intel processor
families. This update provides the corresponding updated microcode mitigations
for Intel Cherry Trail and Bay Trail processor families.

Original advisory details:

Ke Sun, Henrique Kawakami, Kekai Hu, Rodrigo Branco, Giorgi Maisuradze, Dan
Horea Lutas, Andrei Lutas, Volodymyr Pikhur, Stephan van Schaik, Alyssa
Milburn, Sebastian A sterlund, 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 A sterlund, 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 A sterlund, 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 19.04
    intel-microcode - 3.20190514.0ubuntu0.19.04.3
Ubuntu 18.10
    intel-microcode - 3.20190514.0ubuntu0.18.10.2
Ubuntu 18.04 LTS
    intel-microcode - 3.20190514.0ubuntu0.18.04.3
Ubuntu 16.04 LTS
    intel-microcode - 3.20190514.0ubuntu0.16.04.2
Ubuntu 14.04 ESM
    intel-microcode - 3.20190514.0ubuntu0.14.04.2

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

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

References

  o USN-3977-1
  o CVE-2018-12126
  o CVE-2018-12127
  o CVE-2018-12130
  o CVE-2019-11091
  o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/MDS

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