AlmaLinux 8 : microcode_ctl (ALSA-2021:3027) - Nessus

High Plugin ID: 157646

This page contains detailed information about the AlmaLinux 8 : microcode_ctl (ALSA-2021:3027) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

hide

Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 157646
Name: AlmaLinux 8 : microcode_ctl (ALSA-2021:3027)
Filename: alma_linux_ALSA-2021-3027.nasl
Vulnerability Published: 2020-01-28
This Plugin Published: 2022-02-09
Last Modification Time: 2022-02-14
Plugin Version: 1.3
Plugin Type: local
Plugin Family: Alma Linux Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/AlmaLinux/release, Host/AlmaLinux/rpm-list, Host/cpu, Host/local_checks_enabled

Vulnerability Information

Severity: High
Vulnerability Published: 2020-01-28
Patch Published: 2021-08-09
CVE [?]: CVE-2020-0543, CVE-2020-0548, CVE-2020-0549, CVE-2020-8695, CVE-2020-8696, CVE-2020-8698, CVE-2020-24489, CVE-2020-24511, CVE-2020-24512
CPE [?]: cpe:/o:alma:linux:8, p-cpe:/a:alma:linux:microcode_ctl

Synopsis

The remote AlmaLinux host is missing one or more security updates.

Description

The remote AlmaLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ALSA-2021:3027 advisory.

- 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)

- Observable discrepancy in the RAPL interface for some Intel(R) Processors may allow a privileged user to potentially enable information disclosure via local access. (CVE-2020-8695)

- Improper removal of sensitive information before storage or transfer in some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2020-8696)

- Improper isolation of shared resources in some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2020-24511, CVE-2020-8698)

- Incomplete cleanup in some Intel(R) VT-d products may allow an authenticated user to potentially enable escalation of privilege via local access. (CVE-2020-24489)

- Observable timing discrepancy in some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via local access. (CVE-2020-24512)

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

Solution

Update the affected microcode_ctl package.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (GitHub)
Exploit Ease: Exploits (PoCs) are available

Here's the list of publicly known exploits and PoCs for verifying the AlmaLinux 8 : microcode_ctl (ALSA-2021:3027) vulnerability:

GitHub: https://github.com/Stefan-Radu/Speculative-execution-attacks
[CVE-2020-0543]
GitHub: https://github.com/codexlynx/hardware-attacks-state-of-the-art
[CVE-2020-0543]
GitHub: https://github.com/speed47/spectre-meltdown-checker
[CVE-2020-0543]
GitHub: https://github.com/codexlynx/hardware-attacks-state-of-the-art
[CVE-2020-0548]
GitHub: https://github.com/savchenko/windows10
[CVE-2020-0548]
GitHub: https://github.com/codexlynx/hardware-attacks-state-of-the-art
[CVE-2020-0549]
GitHub: https://github.com/savchenko/windows10
[CVE-2020-0549]
GitHub: https://github.com/AlAIAL90/CVE-2020-24511
[CVE-2020-24511: PoC for exploiting CVE-2020-24511]
GitHub: https://github.com/AlAIAL90/CVE-2020-24512
[CVE-2020-24512: PoC for exploiting CVE-2020-24512]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2020-24489
CVSS V2 Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P/E:U/RL:OF/RC:C

CVSS Base Score:	4.6 (Medium)
Impact Subscore:	6.4
Exploitability Subscore:	3.9
CVSS Temporal Score:	3.4 (Low)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	3.4 (Low)

CVSS V3 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS Base Score:	8.8 (High)
Impact Subscore:	6.0
Exploitability Subscore:	2.0
CVSS Temporal Score:	7.7 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.7 (High)

Go back to menu.

Plugin Source

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2021:3027.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(157646);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/14");

  script_cve_id(
    "CVE-2020-0543",
    "CVE-2020-0548",
    "CVE-2020-0549",
    "CVE-2020-8695",
    "CVE-2020-8696",
    "CVE-2020-8698",
    "CVE-2020-24489",
    "CVE-2020-24511",
    "CVE-2020-24512"
  );
  script_xref(name:"ALSA", value:"2021:3027");

  script_name(english:"AlmaLinux 8 : microcode_ctl (ALSA-2021:3027)");

  script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the
ALSA-2021:3027 advisory.

  - 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)

  - Observable discrepancy in the RAPL interface for some Intel(R) Processors may allow a privileged user to
    potentially enable information disclosure via local access. (CVE-2020-8695)

  - Improper removal of sensitive information before storage or transfer in some Intel(R) Processors may allow
    an authenticated user to potentially enable information disclosure via local access. (CVE-2020-8696)

  - Improper isolation of shared resources in some Intel(R) Processors may allow an authenticated user to
    potentially enable information disclosure via local access. (CVE-2020-24511, CVE-2020-8698)

  - Incomplete cleanup in some Intel(R) VT-d products may allow an authenticated user to potentially enable
    escalation of privilege via local access. (CVE-2020-24489)

  - Observable timing discrepancy in some Intel(R) Processors may allow an authenticated user to potentially
    enable information disclosure via local access. (CVE-2020-24512)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://errata.almalinux.org/8/ALSA-2021-3027.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected microcode_ctl package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-24489");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/01/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/08/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:microcode_ctl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Alma Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");

  exit(0);
}


include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');
include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/AlmaLinux/release');
if (isnull(release) || 'AlmaLinux' >!< release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
var os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.x', 'AlmaLinux ' + os_ver);

if (!get_kb_item('Host/AlmaLinux/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);

var pkgs = [
    {'reference':'microcode_ctl-20210216-1.20210608.1.el8_4', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'4'}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var release = NULL;
  var sp = NULL;
  var cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) release = 'Alma-' + package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (reference && release && (!exists_check || rpm_exists(release:release, rpm:exists_check))) {
    if (rpm_check(release:release, sp:sp, cpu:cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'microcode_ctl');
}

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/alma_linux_ALSA-2021-3027.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\alma_linux_ALSA-2021-3027.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/alma_linux_ALSA-2021-3027.nasl

Go back to menu.

How to Run

Here is how to run the AlmaLinux 8 : microcode_ctl (ALSA-2021:3027) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Alma Linux Local Security Checks plugin family.
On the right side table select AlmaLinux 8 : microcode_ctl (ALSA-2021:3027) plugin ID 157646.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl alma_linux_ALSA-2021-3027.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a alma_linux_ALSA-2021-3027.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - alma_linux_ALSA-2021-3027.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state alma_linux_ALSA-2021-3027.nasl -t <IP/HOST>

Go back to menu.

References

See also:

Similar and related Nessus plugins:

152353 - RHEL 7 : microcode_ctl (RHSA-2021:3028)
152360 - CentOS 7 : microcode_ctl (CESA-2021:3028)
152364 - Scientific Linux Security Update : microcode_ctl on SL7.x x86_64 (2021:3028)
152365 - Oracle Linux 8 : microcode_ctl (ELSA-2021-3027)
152366 - Oracle Linux 7 : microcode_ctl (ELSA-2021-3028)
152367 - CentOS 8 : microcode_ctl (CESA-2021:3027)
152447 - RHEL 7 : microcode_ctl (RHSA-2021:3029)
152627 - RHEL 8 : microcode_ctl (RHSA-2021:3176)
152779 - RHEL 7 : microcode_ctl (RHSA-2021:3255)
152926 - RHEL 7 : microcode_ctl (RHSA-2021:3317)
152930 - RHEL 8 : microcode_ctl (RHSA-2021:3364)
152955 - RHEL 7 : microcode_ctl (RHSA-2021:3322)
152965 - RHEL 7 : microcode_ctl (RHSA-2021:3323)
154545 - NewStart CGSL CORE 5.04 / MAIN 5.04 : microcode_ctl Multiple Vulnerabilities (NS-SA-2021-0113)
154587 - NewStart CGSL CORE 5.05 / MAIN 5.05 : microcode_ctl Multiple Vulnerabilities (NS-SA-2021-0139)
155785 - RHEL 6 : microcode_ctl (RHSA-2021:2299)
157636 - AlmaLinux 8 : microcode_ctl (ALSA-2021:2308)
157747 - Rocky Linux 8 : microcode_ctl (RLSA-2021:2308)
160435 - Amazon Linux 2 : kernel (ALASKERNEL-5.4-2022-012)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file alma_linux_ALSA-2021-3027.nasl version 1.3. For more plugins, visit the Nessus Plugin Library.

Go back to menu.

AlmaLinux 8 : microcode_ctl (ALSA-2021:3027) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

Nessus Plugin Library

Solving Problems with Office 365 Email from GoDaddy

Empire Module Library

CrackMapExec Module Library

Metasploit Android Modules

Top 16 Active Directory Vulnerabilities

Top 10 Vulnerabilities: Internal Infrastructure Pentest

Terminal Escape Injection

Cisco Password Cracking and Decrypting Guide

Capture Passwords using Wireshark

SSH Brute Force Attack Tool using PuTTY / Plink (ssh-putty-brute.ps1)

SMB Brute Force Attack Tool in PowerShell (SMBLogin.ps1)

Port Scanner in PowerShell (TCP/UDP)

Nessus CSV Parser and Extractor

Default Password Scanner (default-http-login-hunter.sh)