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ubuntuUbuntuUSN-4628-2
HistoryNov 12, 2020 - 12:00 a.m.

Intel Microcode regression

2020-11-1200:00:00
ubuntu.com
85

2.1 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

6.1 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

17.7%

Releases

  • Ubuntu 20.10
  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 ESM
  • Ubuntu 16.04 ESM
  • Ubuntu 14.04 ESM

Packages

  • intel-microcode - Processor microcode for Intel CPUs

Details

USN-4628-1 provided updated Intel Processor Microcode. Unfortunately,
that update prevented certain processors in the Intel Tiger Lake family
from booting successfully. This update reverts the microcode update for
the Tiger Lake processor family.

Please note that the ‘dis_ucode_ldr’ kernel command line option can be
added in the boot menu to disable microcode loading for system recovery.

We apologize for the inconvenience.

Original advisory details:

Moritz Lipp, Michael Schwarz, Andreas Kogler, David Oswald, Catherine
Easdon, Claudio Canella, and Daniel Gruss discovered that the Intel Running
Average Power Limit (RAPL) feature of some Intel processors allowed a side-
channel attack based on power consumption measurements. A local attacker
could possibly use this to expose sensitive information. (CVE-2020-8695)

Ezra Caltum, Joseph Nuzman, Nir Shildan and Ofir Joseff discovered that
some Intel® Processors did not properly remove sensitive information
before storage or transfer in some situations. A local attacker could
possibly use this to expose sensitive information. (CVE-2020-8696)

Ezra Caltum, Joseph Nuzman, Nir Shildan and Ofir Joseff discovered that
some Intel® Processors did not properly isolate shared resources in some
situations. A local attacker could possibly use this to expose sensitive
information. (CVE-2020-8698)

OSVersionArchitecturePackageVersionFilename
Ubuntu20.10noarchintel-microcode< 3.20201110.0ubuntu0.20.10.2UNKNOWN
Ubuntu20.04noarchintel-microcode< 3.20201110.0ubuntu0.20.04.2UNKNOWN
Ubuntu18.04noarchintel-microcode< 3.20201110.0ubuntu0.18.04.2UNKNOWN
Ubuntu16.04noarchintel-microcode< 3.20201110.0ubuntu0.16.04.2UNKNOWN
Ubuntu14.04noarchintel-microcode< 3.20201110.0ubuntu0.14.04.2UNKNOWN
Ubuntu14.04noarchintel-microcode< 3.20190618.0ubuntu0.14.04.1UNKNOWN

2.1 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

6.1 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

17.7%