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             AUSCERT External Security Bulletin Redistribution

                USN-4385-1: Intel Microcode vulnerabilities
                               10 June 2020


        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-2020-0549 CVE-2020-0548 CVE-2020-0543

Reference:         ESB-2020.1994

Original Bulletin: 

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USN-4385-1: Intel Microcode vulnerabilities
9 June 2020

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

  o Ubuntu 20.04 LTS
  o Ubuntu 19.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 ESM


Several security issues were fixed in Intel Microcode.

Software Description

  o intel-microcode - Processor microcode for Intel CPUs


It was discovered that memory contents previously stored in microarchitectural
special registers after RDRAND, RDSEED, and SGX EGETKEY read operations on
Intel client and Xeon E3 processors may be briefly exposed to processes on the
same or different processor cores. A local attacker could use this to expose
sensitive information. (CVE-2020-0543)

It was discovered that on some Intel processors, partial data values previously
read from a vector register on a physical core may be propagated into unused
portions of the store buffer. A local attacker could possible use this to
expose sensitive information. (CVE-2020-0548)

It was discovered that on some Intel processors, data from the most recently
evicted modified L1 data cache (L1D) line may be propagated into an unused
(invalid) L1D fill buffer. A local attacker could possibly use this to expose
sensitive information. (CVE-2020-0549)

Update instructions

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

Ubuntu 20.04 LTS
    intel-microcode - 3.20200609.0ubuntu0.20.04.0
Ubuntu 19.10
    intel-microcode - 3.20200609.0ubuntu0.19.10.0
Ubuntu 18.04 LTS
    intel-microcode - 3.20200609.0ubuntu0.18.04.0
Ubuntu 16.04 LTS
    intel-microcode - 3.20200609.0ubuntu0.16.04.0
Ubuntu 14.04 ESM
    intel-microcode - 3.20200609.0ubuntu0.14.04.0

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.


  o CVE-2020-0543
  o CVE-2020-0548
  o CVE-2020-0549
  o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SRBDS

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