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Debian DSA-4934-1 : intel-microcode - security update

high Nessus Plugin ID 151037

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Synopsis

The remote Debian host is missing a security-related update.

Description

This update ships updated CPU microcode for some types of Intel CPUs and provides mitigations for security vulnerabilities which could result in privilege escalation in combination with VT-d and various side channel attacks.

Solution

Upgrade the intel-microcode packages.

For the stable distribution (buster), these problems have been fixed in version 3.20210608.2~deb10u1.

Note that there are two reported regressions; for some CoffeeLake CPUs this update may break iwlwifi (https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/i ssues/56) and some for Skylake R0/D0 CPUs on systems using a very outdated firmware/BIOS, the system may hang on boot:
(https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/i ssues/31)

If you are affected by those issues, you can recover by disabling microcode loading on boot (as documented in README.Debian, also available online at https://salsa.debian.org/hmh/intel-microcode/-/blob/master/debian/READ ME.Debian)

See Also

http://www.nessus.org/u?8b9d243a

http://www.nessus.org/u?019586d4

https://packages.debian.org/source/buster/intel-microcode

https://www.debian.org/security/2021/dsa-4934

Plugin Details

Severity: High

ID: 151037

File Name: debian_DSA-4934.nasl

Version: 1.24

Type: local

Agent: unix

Published: 6/28/2021

Updated: 10/18/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2020-24489

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:intel-microcode

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/26/2021

Vulnerability Publication Date: 6/9/2021

Reference Information

CVE: CVE-2020-24489, CVE-2020-24511, CVE-2020-24512, CVE-2020-24513

DSA: 4934