Amazon Linux AMI : microcode_ctl (ALAS-2020-1396)

medium Nessus Plugin ID 138638

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Synopsis

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

Description

The version of microcode_ctl installed on the remote host is prior to 2.1-47.39. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2020-1396 advisory.

A new domain bypass transient execution attack known as Special Register Buffer Data Sampling (SRBDS) has been found. This flaw allows data values from special internal registers to be leaked by an attacker able to execute code on any core of the CPU. An unprivileged, local attacker can use this flaw to infer values returned by affected instructions known to be commonly used during cryptographic operations that rely on uniqueness, secrecy, or both. 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. (CVE-2020-0543)

Cleanup errors in some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2020-0548)

Cleanup errors in some data cache evictions for some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2020-0549)

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 'yum update microcode_ctl' to update your system.

Plugin Details

Severity: Medium

ID: 138638

File Name: ala_ALAS-2020-1396.nasl

Version: 1.4

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 7/20/2020

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

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

CVSS Score Source: CVE-2020-0549

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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:U/RL:O/RC:C

Vulnerability Information

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

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/15/2020

Vulnerability Publication Date: 1/28/2020

Reference Information

CVE: CVE-2020-0543, CVE-2020-0548, CVE-2020-0549

ALAS: 2020-1396

Detections

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