Security Updates for Exchange (November 2021) (Remote) - Nessus

High Plugin ID: 155962

This page contains detailed information about the Security Updates for Exchange (November 2021) (Remote) 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: 155962
Name: Security Updates for Exchange (November 2021) (Remote)
Filename: smb_nt_ms21_nov_exchange_remote.nasl
Vulnerability Published: 2021-11-09
This Plugin Published: 2021-12-09
Last Modification Time: 2022-02-25
Plugin Version: 1.5
Plugin Type: remote
Plugin Family: Windows
Dependencies: exchange_detect.nbin
Required KB Items [?]: installed_sw/Exchange Server

Vulnerability Information

Severity: High
Vulnerability Published: 2021-11-09
Patch Published: 2021-11-09
CVE [?]: CVE-2021-41349, CVE-2021-42305, CVE-2021-42321
CPE [?]: cpe:/a:microsoft:exchange_server
Exploited by Malware: True

Synopsis

The Microsoft Exchange Server installed on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft Exchange Server installed on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

- A session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2021-41349, CVE-2021-42305)

- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-42321)

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

Solution

Microsoft has released KB5007409 to address this issue.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
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 (November 2021) (Remote) vulnerability:

Metasploit: exploit/windows/http/exchange_chainedserializationbinder_denylist_typo_rce
[Microsoft Exchange Server ChainedSerializationBinder Deny List Typo RCE]
GitHub: https://github.com/0x0021h/expbox
[CVE-2021-41349]
GitHub: https://github.com/cepxeo/pentest_notes
[CVE-2021-41349]
GitHub: https://github.com/exploit-io/CVE-2021-41349
[CVE-2021-41349: Exploiting: CVE-2021-41349]
GitHub: https://github.com/0x0021h/expbox
[CVE-2021-42321]
GitHub: https://github.com/FDlucifer/Proxy-Attackchain
[CVE-2021-42321]
GitHub: https://github.com/Mr-xn/Penetration_Testing_POC
[CVE-2021-42321]
GitHub: https://github.com/mandiant/heyserial
[CVE-2021-42321]
GitHub: https://github.com/timb-machine-mirrors/CVE-2021-42321_poc
[CVE-2021-42321]
GitHub: https://github.com/DarkSprings/CVE-2021-42321
[CVE-2021-42321: Microsoft Exchange Server Poc]

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-2021-42321
CVSS V2 Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P/E:H/RL:OF/RC:C

CVSS Base Score:	6.5 (Medium)
Impact Subscore:	6.4
Exploitability Subscore:	8.0
CVSS Temporal Score:	5.7 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.7 (Medium)

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

CVSS Base Score:	8.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	2.8
CVSS Temporal Score:	8.4 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.4 (High)

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(155962);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/25");

  script_cve_id("CVE-2021-41349", "CVE-2021-42305", "CVE-2021-42321");
  script_xref(name:"IAVA", value:"2021-A-0543-S");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/12/01");
  script_xref(name:"MSKB", value:"5007409");
  script_xref(name:"MSFT", value:"MS21-5007409");

  script_name(english:"Security Updates for Exchange (November 2021) (Remote)");

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

  - A session spoofing vulnerability exists. An attacker can
    exploit this to perform actions with the privileges of
    another user. (CVE-2021-41349, CVE-2021-42305)

  - A remote code execution vulnerability. An attacker can
    exploit this to bypass authentication and execute
    unauthorized arbitrary commands. (CVE-2021-42321)

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://support.microsoft.com/en-us/help/5007409");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released KB5007409 to address this issue.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-42321");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Microsoft Exchange Server ChainedSerializationBinder Deny List Typo RCE');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/11/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/11/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/12/09");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  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");

  script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("exchange_detect.nbin");
  script_require_keys("installed_sw/Exchange Server");

  exit(0);
}

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

var port = get_http_port(default:80);
var app = 'Exchange Server';
var app_info = vcf::get_app_info(app:app, port:port);

if (report_paranoia < 2)
  vcf::check_granularity(app_info:app_info, sig_segments:4);

var constraints = [
 {'min_version' : '15.0.1497', 'fixed_version':'15.0.1497.26'},
 {'min_version' : '15.1.2375', 'fixed_version':'15.1.2375.17'},
 {'min_version' : '15.1.2308', 'fixed_version':'15.1.2308.20'},
 {'min_version' : '15.2.986', 'fixed_version':'15.2.986.14'},
 {'min_version' : '15.2.922', 'fixed_version':'15.2.922.19'}
];

vcf::check_version_and_report(
  app_info:app_info,
  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_ms21_nov_exchange_remote.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\smb_nt_ms21_nov_exchange_remote.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/smb_nt_ms21_nov_exchange_remote.nasl

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How to Run

Here is how to run the Security Updates for Exchange (November 2021) (Remote) 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 plugin family.
On the right side table select Security Updates for Exchange (November 2021) (Remote) plugin ID 155962.
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_ms21_nov_exchange_remote.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a smb_nt_ms21_nov_exchange_remote.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_ms21_nov_exchange_remote.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_ms21_nov_exchange_remote.nasl -t <IP/HOST>

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References

MSKB | Microsoft Knowledge Base:

5007409

MSFT | Microsoft Security Bulletin:

MS21-5007409

IAVA | Information Assurance Vulnerability Alert:

2021-A-0543-S

See also:

Similar and related Nessus plugins:

154999 - Security Updates for Exchange (November 2021)
147724 - Security Update for Microsoft Visual Studio Code ESLint Extension (March 2021)
138523 - Security Update for Microsoft Visual Studio Code ESLint Extension (July 2020)
146417 - Security Update for Microsoft Visual Studio Code npm-script Extension (Feb 2021)
149384 - Security Update for Microsoft Visual Studio Code Remote Containers Extension (May 2021)
156113 - Security Update for Microsoft Visual Studio Code Remote WSL Extension (December 2021)
108408 - Security Update for .NET Core (March 2018)
126630 - Security Updates for Microsoft SQL Server (Uncredentialed Check) (July 2019)
125164 - Security Update for Microsoft ASP.NET Core (DoS) (May 2019)
125217 - Security Update for .NET Core (May 2019)
125225 - Security Update for .NET Core SDK (May 2019)
131318 - Security Update for Microsoft Visual Studio Code (CVE-2019-1414)
128770 - Security Update for Microsoft ASP.NET Core (Sep 2019)
128771 - Security Update for .NET Core (Sep 2019)
128772 - Security Update for .NET Core SDK (Sep 2019)
133718 - Security Updates for Microsoft SQL Server (Uncredentialed Check) (February 2020)
132993 - Security Update for .NET Core (January 2020)
132994 - Security Update for .NET Core SDK (January 2020)
138465 - Security Update for .NET Core (July 2020)
138466 - Security Update for .NET Core SDK (July 2020)
141931 - Security Update for Microsoft Visual Studio Code (CVE-2020-17023)
152428 - Security Update for Microsoft Azure Active Directory Connect (August 2021)
146332 - Security Update for Forefront Endpoint Protection (February 2021)
146334 - Security Update for Windows Defender (February 2021)
153214 - Security Updates for Microsoft Internet Explorer OOB (Sept 2021) (deprecated)
144886 - Security Update for Forefront Endpoint Protection (January 2021)
144876 - Security Update for Windows Defender (January 2021)
157879 - Security Update for .NET Core (February 2022)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file smb_nt_ms21_nov_exchange_remote.nasl version 1.5. For more plugins, visit the Nessus Plugin Library.

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Security Updates for Exchange (November 2021) (Remote) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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