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[SECURITY] [DLA 3511-1] amd64-microcode security update

Debian LTS Advisory DLA-3511-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                   Jochen Sprickerhof
July 31, 2023                                 https://wiki.debian.org/LTS

Package        : amd64-microcode
Version        : 3.20230719.1+deb10u1
CVE ID         : CVE-2023-20593
Debian Bug     : 1041863

Tavis Ormandy discovered that under specific microarchitectural
circumstances, a vector register in "Zen 2" CPUs may not be written to 0
correctly. This flaw allows an attacker to leak register contents across
concurrent processes, hyper threads and virtualized guests.

For details please refer to

The initial microcode release by AMD only provides updates for second
generation EPYC CPUs: Various Ryzen CPUs are also affected, but no
updates are available yet. Fixes will be provided in a later update once
they are released.

For more specific details and target dates please refer to the AMD
advisory at

For Debian 10 buster, this problem has been fixed in version
3.20230719.1+deb10u1. Additionally the update contains a fix
for CVE-2019-9836.

We recommend that you upgrade your amd64-microcode packages.

For the detailed security status of amd64-microcode please refer to
its security tracker page at:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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