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nessusThis script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS21_AUG_WIN_DEFENDER.NASL
HistoryAug 10, 2021 - 12:00 a.m.

Security Update for Windows Defender (August 2021)

2021-08-1000:00:00
This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
16

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

4.6 Medium

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:P/A:P

0.0004 Low

EPSS

Percentile

9.7%

The Malware Protection Engine version of Microsoft Windows Defender installed on the remote Windows host is equal or prior to 1.1.18400.4. It is, therefore, affected by a unspecified privilege escalation vulnerability. An authenticated, local attacker can exploit this to gain administrator access to the system.

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

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

if (description)
{
  script_id(152427);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/08/25");

  script_cve_id("CVE-2021-34471");
  script_xref(name:"IAVA", value:"2021-A-0372");

  script_name(english:"Security Update for Windows Defender (August 2021)");

  script_set_attribute(attribute:"synopsis", value:
"An antimalware application installed on the remote host is affected by privilege escalation vulnerability.");
  script_set_attribute(attribute:"description", value:
"The Malware Protection Engine version of Microsoft Windows Defender installed on the remote Windows host
is equal or prior to 1.1.18400.4. It is, therefore, affected by a unspecified privilege escalation vulnerability. An
authenticated, local attacker can exploit this to gain administrator access to the system.");
  # https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34471
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9c1e6309");
  # https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/manage-updates-baselines-microsoft-defender-antivirus?view=o365-worldwide
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3bed4ba6");
  script_set_attribute(attribute:"solution", value:
"Enable automatic updates to update the malware engine for the relevant antimalware applications. Refer to Knowledge Base
Article 2510781 for information on how to verify that MMPE has been updated.");
  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:U/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-2021-34471");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/08/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/08/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/08/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:windows_defender");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("microsoft_windows_defender_win_installed.nbin");
  script_require_keys("installed_sw/Windows Defender");

  exit(0);
}

include('vcf.inc');
include('vcf_extras.inc');

var app = 'Windows Defender';

var app_info = vcf::get_app_info(app:app, win_local:TRUE);

# Check if disabled
if (!isnull(app_info['Disabled']))
  exit(0,'Windows Defender is disabled.');

# Check if we got the Malware Engine Version
if (isnull(app_info['Engine Version']))
  exit(0,'Unable to get the Malware Engine Version.');

var constraints = [{'fixed_version':'1.1.18400.4'}];

vcf::av_checks::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING, check:'Engine Version');
VendorProductVersionCPE
microsoftwindowscpe:/o:microsoft:windows
microsoftwindows_defendercpe:/a:microsoft:windows_defender

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

4.6 Medium

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:P/A:P

0.0004 Low

EPSS

Percentile

9.7%

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