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nessusThis script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS21_AUG_RDC.NASL
HistoryAug 19, 2021 - 12:00 a.m.

Remote Desktop client for Windows RCE (August 2021)

2021-08-1900:00:00
This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
38

6.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.1 High

AI Score

Confidence

High

0.052 Low

EPSS

Percentile

93.1%

The Windows Remote Desktop client for Windows installed on the remote host is affected by a remote code execution vulnerability. An attacker who successfully exploited the vulnerability could execute arbitrary code.

#%NASL_MIN_LEVEL 70300
##
# Tenable Network Security, Inc.
##
# The descriptive text and package checks in this plugin were
# extracted from the Microsoft Security Updates API. The text
# itself is copyright (C) Microsoft Corporation.
#

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

if (description)
{
  script_id(152669);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/04");

  script_cve_id("CVE-2021-34535");

  script_name(english:"Remote Desktop client for Windows RCE (August 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The Windows app installed on the remote host is affected by a remote code
execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The Windows Remote Desktop client for Windows installed on the remote
host is affected by a remote code execution vulnerability. An attacker who
successfully exploited the vulnerability could execute arbitrary code.");
  # https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34535
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d2a45a5b");
  # https://docs.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/windowsdesktop-whatsnew#updates-for-version-122223
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bb5c6218");
  script_set_attribute(attribute:"solution", value:
"Upgrade to client version 1.2.2223 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-34535");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  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:"2021/08/19");

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

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

  script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("remote_desktop_installed.nbin");
  script_require_keys("installed_sw/Microsoft Remote Desktop");

  exit(0);
}

include('vcf.inc');

var appname = "Microsoft Remote Desktop";

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

vcf::check_granularity(app_info:app_info, sig_segments:3);

var constraints = [
    { 'fixed_version' : '1.2.2223.0' }
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);
VendorProductVersionCPE
microsoftwindowscpe:/o:microsoft:windows

6.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.1 High

AI Score

Confidence

High

0.052 Low

EPSS

Percentile

93.1%