Security Updates for Exchange (September 2020) - Nessus

High Plugin ID: 140427

This page contains detailed information about the Security Updates for Exchange (September 2020) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 140427
Name: Security Updates for Exchange (September 2020)
Filename: smb_nt_ms20_sep_exchange.nasl
Vulnerability Published: 2020-09-08
This Plugin Published: 2020-09-08
Last Modification Time: 2022-04-04
Plugin Version: 1.8
Plugin Type: local
Plugin Family: Windows : Microsoft Bulletins
Dependencies: microsoft_exchange_installed.nbin, ms_bulletin_checks_possible.nasl
Required KB Items [?]: SMB/MS_Bulletin_Checks/Possible

Vulnerability Information

Severity: High
Vulnerability Published: 2020-09-08
Patch Published: 2020-09-08
CVE [?]: CVE-2020-16875
CPE [?]: cpe:/a:microsoft:exchange_server

Synopsis

The Microsoft Exchange Server installed on the remote host is missing a security update.

Description

The Microsoft Exchange Server installed on the remote host is missing a security update. It is, therefore, affected by the following vulnerability :

- A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user. An attacker could then install programs; view, change, or delete data; or create new accounts. Exploitation of the vulnerability requires that a specially crafted email be sent to a vulnerable Exchange server. The security update addresses the vulnerability by correcting how Microsoft Exchange handles objects in memory. (CVE-2020-16875)

Solution

Microsoft has released KB4577352 to address this issue.

Public Exploits

Target Network Port(s): 139, 445
Target Asset(s): Host/patch_management_checks
Exploit Available: True (Metasploit Framework, GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Security Updates for Exchange (September 2020) vulnerability:

Metasploit: exploit/windows/http/exchange_ecp_dlp_policy
[Microsoft Exchange Server DlpUtils AddTenantDlpPolicy RCE]
GitHub: https://github.com/EdgeSecurityTeam/Vulnerability
[CVE-2020-16875]
GitHub: https://github.com/EvilAnne/2020-Read-article
[CVE-2020-16875]
GitHub: https://github.com/SexyBeast233/SecBooks
[CVE-2020-16875]
GitHub: https://github.com/mdisec/mdisec-twitch-yayinlari
[CVE-2020-16875]
GitHub: https://github.com/r0eXpeR/redteam_vul
[CVE-2020-16875]

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-2020-16875
CVSS V2 Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	9.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	8.0
CVSS Temporal Score:	7.4 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.4 (High)

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

CVSS Base Score:	7.2 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.2
CVSS Temporal Score:	6.7 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.7 (Medium)

STIG Severity [?]: I
STIG Risk Rating: High

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Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) 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(140427);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/04");

  script_cve_id("CVE-2020-16875");
  script_xref(name:"MSKB", value:"4577352");
  script_xref(name:"MSFT", value:"MS20-4577352");
  script_xref(name:"IAVA", value:"2020-A-0413-S");

  script_name(english:"Security Updates for Exchange (September 2020)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Exchange Server installed on the remote host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Exchange Server installed on the remote host
is missing a security update. It is, therefore, affected by
the following vulnerability :

  - A remote code execution vulnerability exists in
    Microsoft Exchange software when the software fails to
    properly handle objects in memory. An attacker who
    successfully exploited the vulnerability could run
    arbitrary code in the context of the System user. An
    attacker could then install programs; view, change, or
    delete data; or create new accounts. Exploitation of the
    vulnerability requires that a specially crafted email be
    sent to a vulnerable Exchange server. The security
    update addresses the vulnerability by correcting how
    Microsoft Exchange handles objects in memory.
    (CVE-2020-16875)");
  # https://support.microsoft.com/en-us/help/4577352/security-update-for-exchange-server-2019-and-2016
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9455d8ba");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released KB4577352 to address this issue.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  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:H/UI:N/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-2020-16875");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Microsoft Exchange Server DlpUtils AddTenantDlpPolicy RCE');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/09/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/09/08");

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

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

  script_copyright(english:"This script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ms_bulletin_checks_possible.nasl", "microsoft_exchange_installed.nbin");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include('vcf_extras_microsoft.inc');

var app_info = vcf::microsoft::exchange::get_app_info();

var constraints =
[
  {
    'product': '2016',
    'unsupported_cu': 15,
    'cu' : 16,
    'min_version': '15.01.1979.0',
    'fixed_version': '15.01.1979.6',
    'kb': '4577352'
  },
  {
    'product' : '2016',
    'unsupported_cu' : 15,
    'cu' : 17,
    'min_version': '15.01.2044.0',
    'fixed_version': '15.01.2044.6',
    'kb': '4577352'
  },
 {
    'product' : '2019',
    'unsupported_cu' : 4,
    'cu' : 5,
    'min_version': '15.02.595.0',
    'fixed_version': '15.02.595.6',
    'kb': '4577352'
  },
  {
    'product' : '2019',
    'unsupported_cu' : 4,
    'cu' : 6,
    'min_version': '15.02.659.0',
    'fixed_version': '15.02.659.6',
    'kb': '4577352'
  }
];

vcf::microsoft::exchange::check_version_and_report
(
  app_info:app_info,
  bulletin:'MS20-09',
  constraints:constraints,
  severity:SECURITY_WARNING
);

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/smb_nt_ms20_sep_exchange.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\smb_nt_ms20_sep_exchange.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/smb_nt_ms20_sep_exchange.nasl

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How to Run

Here is how to run the Security Updates for Exchange (September 2020) 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 Windows : Microsoft Bulletins plugin family.
On the right side table select Security Updates for Exchange (September 2020) plugin ID 140427.
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 smb_nt_ms20_sep_exchange.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a smb_nt_ms20_sep_exchange.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - smb_nt_ms20_sep_exchange.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 smb_nt_ms20_sep_exchange.nasl -t <IP/HOST>

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References

MSKB | Microsoft Knowledge Base:

4577352

MSFT | Microsoft Security Bulletin:

MS20-4577352

IAVA | Information Assurance Vulnerability Alert:

2020-A-0413-S

See also:

Similar and related Nessus plugins:

140627 - FreeBSD : Node.js -- September 2020 Security Releases (4ca5894c-f7f1-11ea-8ff8-0022489ad614)
140795 - Node.js Multiple Vulnerabilities (September 2020 Security Releases)
140414 - KB4570333: Windows 10 Version 1809 and Windows Server 2019 September 2020 Security Update
140415 - KB4571756: Windows 10 Version 2004 September 2020 Security Update
140416 - KB4574727: Windows 10 Version 1903 and Windows 10 Version 1909 September 2020 Security Update
140417 - KB4577015: Windows 10 Version 1607 and Windows Server 2016 September 2020 Security Update
140418 - KB4577032: Windows 10 Version 1803 September 2020 Security Update
140419 - KB4577048: Windows Server 2012 September 2020 Security Update
140420 - KB4577041: Windows 10 Version 1709 September 2020 Security Update
140421 - KB4577049: Windows 10 September 2020 Security Update
140422 - KB4577053: Windows 7 and Windows Server 2008 R2 September 2020 Security Update
140423 - KB4577070: Windows Server 2008 September 2020 Security Update
140424 - KB4577071: Windows 8.1 and Windows Server 2012 R2 September 2020 Security Update

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file smb_nt_ms20_sep_exchange.nasl version 1.8. For more plugins, visit the Nessus Plugin Library.

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Security Updates for Exchange (September 2020) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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