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CVE-2020-0543

Published: 9 June 2020

Incomplete cleanup from specific special register read operations in some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via local access.

From the Ubuntu Security Team

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.

Notes

AuthorNote
tyhicks
This issue only affects Intel client and Xeon E3 processors
sbeattie
also known as "CrossTalk"
sbeattie
Affected processor families:
=============  ============  ========
common name    Family_Model  Stepping
=============  ============  ========
IvyBridge      06_3AH        All
Haswell        06_3CH        All
Haswell_L      06_45H        All
Haswell_G      06_46H        All
Broadwell_G    06_47H        All
Broadwell      06_3DH        All
Skylake_L      06_4EH        All
Skylake        06_5EH        All
Kabylake_L     06_8EH        <= 0xC
Kabylake       06_9EH        <= 0xD
=============  ============  ========

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
intel-microcode
Launchpad, Ubuntu, Debian
focal
Released (3.20200609.0ubuntu0.20.04.0)
groovy
Released (3.20200609.0ubuntu0.20.04.0)
jammy Not vulnerable

bionic
Released (3.20200609.0ubuntu0.18.04.0)
disco Ignored
(end of life)
eoan
Released (3.20200609.0ubuntu0.19.10.0)
kinetic Not vulnerable

lunar Not vulnerable

trusty
Released (3.20200609.0ubuntu0.14.04.0)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needed

xenial
Released (3.20200609.0ubuntu0.16.04.0)
mantic Not vulnerable

xen
Launchpad, Ubuntu, Debian
bionic Needed

jammy Not vulnerable
(4.14)
upstream
Released (4.14)
focal
Released (4.11.3+24-g14b62ab3e5-1ubuntu2.3)
kinetic Not vulnerable
(4.14)
lunar Not vulnerable
(4.14)
trusty Does not exist

xenial Needs triage

mantic Not vulnerable
(4.14)
Binaries built from this source package are in Universe and so are supported by the community.

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N