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Debian DSA-5459-1 : amd64-microcode - security update

critical Nessus Plugin ID 178916

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 / 12 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-5459 advisory.

 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 https://lock.cmpxchg8b.com/zenbleed.html https://github.com/google/security- research/security/advisories/GHSA-v6wh-rxpg-cmm8 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 https://www.amd.com/en/resources/product- security/bulletin/amd-sb-7008.html For the oldstable distribution (bullseye), this problem has been fixed in version 3.20230719.1~deb11u1. Additionally the update contains a fix for CVE-2019-9836. For the stable distribution (bookworm), this problem has been fixed in version 3.20230719.1~deb12u1. 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: https://security-tracker.debian.org/tracker/amd64-microcode

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the amd64-microcode packages.

For the stable distribution (bookworm), this problem has been fixed in version 3.20230719.1~deb12u1.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1041863

http://www.nessus.org/u?75dfdaf9

https://www.debian.org/security/2023/dsa-5459

https://security-tracker.debian.org/tracker/CVE-2019-9836

https://security-tracker.debian.org/tracker/CVE-2023-20593

https://packages.debian.org/source/bullseye/amd64-microcode

https://packages.debian.org/source/bookworm/amd64-microcode

Plugin Details

Severity: Critical

ID: 178916

File Name: debian_DSA-5459.nasl

Version: 1.3

Type: local

Agent: unix

Published: 7/27/2023

Updated: 1/24/2025

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2019-9836

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2023-20593

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.5

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS Score Source: CVE-2023-20593

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:amd64-microcode

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/25/2023

Vulnerability Publication Date: 6/25/2019

Reference Information

CVE: CVE-2019-9836, CVE-2023-20593