Amazon Linux 2023 : microcode_ctl (ALAS2023-2023-436)

high Nessus Plugin ID 185722

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Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-436 advisory.

2024-03-27: CVE-2023-23908 was added to this advisory.

An issue was found in redundant REX instruction prefix values affecting third generation Intel Xeon Scalable (Icelake) processors. The issue may allow a local third-party actor using such instructions to cause a denial of service (DOS) or achieve privilege escalation. CVE-2023-23583 only affects Amazon Linux customers on EC2 metal platforms. Please refer to the AWS Security Bulletin for more information on the affected instance families and the impacts on AWS services:
(https://aws.amazon.com/security/security-bulletins/AWS-2023-013) (CVE-2023-23583)

Improper access control in some 3rd Generation Intel(R) Xeon(R) Scalable processors may allow a privileged user to potentially enable information disclosure via local access. (CVE-2023-23908)

Tenable has extracted the preceding description block directly from the tested product 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

Run 'dnf update microcode_ctl --releasever 2023.2.20231113' to update your system.

Plugin Details

Severity: High

ID: 185722

File Name: al2023_ALAS2023-2023-436.nasl

Version: 1.6

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 11/15/2023

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2023-23583

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:microcode_ctl, cpe:/o:amazon:linux:2023

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 11/9/2023

Vulnerability Publication Date: 11/9/2023

Reference Information

CVE: CVE-2023-23583, CVE-2023-23908

Detections

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