Security Updates for Internet Explorer (March 2021) - Nessus

High Plugin ID: 147228

This page contains detailed information about the Security Updates for Internet Explorer (March 2021) 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: 147228
Name: Security Updates for Internet Explorer (March 2021)
Filename: smb_nt_ms21_mar_internet_explorer.nasl
Vulnerability Published: 2021-03-09
This Plugin Published: 2021-03-09
Last Modification Time: 2021-11-30
Plugin Version: 1.8
Plugin Type: local
Plugin Family: Windows : Microsoft Bulletins
Dependencies: ms_bulletin_checks_possible.nasl, smb_check_rollup.nasl, smb_hotfixes.nasl
Required KB Items [?]: SMB/MS_Bulletin_Checks/Possible

Vulnerability Information

Severity: High
Vulnerability Published: 2021-03-09
Patch Published: 2021-03-09
CVE [?]: CVE-2021-26411
CPE [?]: cpe:/o:microsoft:windows
Exploited by Malware: True

Synopsis

The Internet Explorer installation on the remote host is missing a security update.

Description

The Internet Explorer installation on the remote host is missing a security update. It is, therefore, affected by the following vulnerability:

- A memory corruption vulnerability exists. An attacker can exploit this to corrupt the memory and cause unexpected behaviors within the system/application. (CVE-2021-26411)

Solution

Microsoft has released the following security updates to address this issue: -KB5000800 -KB5000841 -KB5000844 -KB5000847 -KB5000848

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the Security Updates for Internet Explorer (March 2021) vulnerability:

GitHub: https://github.com/CrackerCat/CVE-2021-26411
[CVE-2021-26411]
GitHub: https://github.com/EdgeSecurityTeam/Vulnerability
[CVE-2021-26411]
GitHub: https://github.com/KAB8345/CVE-2021-26411
[CVE-2021-26411]

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-2021-26411
CVSS V2 Vector: AV:N/AC:H/Au:N/C:P/I:P/A:P/E:H/RL:OF/RC:C

CVSS Base Score:	5.1 (Medium)
Impact Subscore:	6.4
Exploitability Subscore:	4.9
CVSS Temporal Score:	4.4 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	4.4 (Medium)

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

CVSS Base Score:	7.5 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.6
CVSS Temporal Score:	7.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.2 (High)

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

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Plugin Source

#
# (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('compat.inc');

if (description)
{
  script_id(147228);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/11/30");

  script_cve_id("CVE-2021-26411");
  script_xref(name:"MSKB", value:"5000847");
  script_xref(name:"MSFT", value:"MS21-5000847");
  script_xref(name:"MSKB", value:"5000800");
  script_xref(name:"MSKB", value:"5000841");
  script_xref(name:"MSKB", value:"5000844");
  script_xref(name:"MSKB", value:"5000848");
  script_xref(name:"MSFT", value:"MS21-5000800");
  script_xref(name:"MSFT", value:"MS21-5000841");
  script_xref(name:"MSFT", value:"MS21-5000844");
  script_xref(name:"MSFT", value:"MS21-5000848");
  script_xref(name:"IAVA", value:"2021-A-0130-S");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/11/17");

  script_name(english:"Security Updates for Internet Explorer (March 2021)");

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

  - A memory corruption vulnerability exists. An attacker
    can exploit this to corrupt the memory and cause
    unexpected behaviors within the system/application.
    (CVE-2021-26411)");
  # https://support.microsoft.com/en-us/topic/kb5000800-cumulative-security-update-for-internet-explorer-march-9-2021-b7b43be0-e9ef-48b6-b102-ed28fd89e0f2
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e8426b33");
  # https://support.microsoft.com/en-us/topic/march-9-2021-kb5000841-monthly-rollup-3a2cced1-f436-40c3-a8a1-645f86759088
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8c5851d4");
  # https://support.microsoft.com/en-us/topic/march-9-2021-kb5000844-monthly-rollup-d90d0eb1-6319-4a7e-97f6-68fbd306fd5a
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?177a5bc6");
  # https://support.microsoft.com/en-us/topic/march-9-2021-kb5000847-monthly-rollup-8afa2933-e9da-4481-a0bc-18deb314974e
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?df958afd");
  # https://support.microsoft.com/en-us/topic/march-9-2021-kb5000848-monthly-rollup-52f23db9-e1b0-4829-81b9-198fc82891a3
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5ff1e9b3");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:  
  -KB5000800
  -KB5000841
  -KB5000844
  -KB5000847
  -KB5000848");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/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:H/PR:N/UI:R/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-2021-26411");

  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:"vuln_publication_date", value:"2021/03/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/03/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
  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) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}
include("smb_hotfixes_fcheck.inc");
include("smb_hotfixes.inc");
include("smb_func.inc");

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = 'MS21-03';
kbs = make_list(
  '5000800',
  '5000841',
  '5000844',
  '5000847',
  '5000848'
);

if (get_kb_item("Host/patch_management_checks")) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_WARNING);

get_kb_item_or_exit("SMB/Registry/Enumerated");
os = get_kb_item_or_exit("SMB/WindowsVersion", exit_code:1);

if (hotfix_check_sp_range(vista:'2', win7:'1', win8:'0',  win81:'0') <= 0) audit(AUDIT_OS_SP_NOT_VULN);

productname = get_kb_item_or_exit("SMB/ProductName", exit_code:1);
if ("Windows 8" >< productname && "8.1" >!< productname)
 audit(AUDIT_OS_SP_NOT_VULN);
if ("Vista" >< productname) audit(AUDIT_OS_SP_NOT_VULN);

if (hotfix_check_server_core() == 1) audit(AUDIT_WIN_SERVER_CORE);

share = hotfix_get_systemdrive(as_share:TRUE, exit_on_fail:TRUE);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);

if (
  # Windows 8.1 / Windows Server 2012 R2
  # Internet Explorer 11
  hotfix_is_vulnerable(os:"6.3", sp:0, file:"mshtml.dll", version:"11.0.9600.19963", min_version:"11.0.9600.16000", dir:"\system32", bulletin:bulletin, kb:"5000800") ||

  # Windows Server 2012
  # Internet Explorer 11
  hotfix_is_vulnerable(os:"6.2", sp:0, file:"mshtml.dll", version:"11.0.9600.19963", min_version:"11.0.9600.16000", dir:"\system32", bulletin:bulletin, kb:"5000800") ||

  # Windows 7 / Server 2008 R2
  # Internet Explorer 11
  hotfix_is_vulnerable(os:"6.1", sp:1, file:"mshtml.dll", version:"11.0.9600.19963", min_version:"11.0.9600.16000", dir:"\system32", bulletin:bulletin, kb:"5000800") ||

  # Windows Server 2008
  # Internet Explorer 9
  hotfix_is_vulnerable(os:"6.0", sp:2, file:"mshtml.dll", version:"9.0.8112.21532", min_version:"9.0.8112.16000", dir:"\system32", bulletin:bulletin, kb:"5000800")
)
{
  report =  '\nNote: The fix for this issue is available in either of the following updates:\n';
  report += '  - KB5000800 : Cumulative Security Update for Internet Explorer\n';

  if(os == "6.3")
  {
    report += '  - KB5000848 : Windows 8.1 / Server 2012 R2 Monthly Rollup\n';
    hotfix_add_report(bulletin:'MS21-03', kb:'5000848', report);
  }
  else if(os == "6.2")
  {
    report += '  - KB5000847 : Windows Server 2012 Monthly Rollup\n';
    hotfix_add_report(bulletin:'MS21-03', kb:'5000847', report);
  }
  else if(os == "6.1")
  {
    report += '  - KB5000841 : Windows 7 / Server 2008 R2 Monthly Rollup\n';
    hotfix_add_report(bulletin:'MS21-03', kb:'5000841', report);
  }
  else if(os == "6.0")
  {
    report += '  - KB5000844 : Windows Server 2008 Monthly Rollup\n';
    hotfix_add_report(bulletin:'MS21-03', kb:'5000844', report);
  }

  set_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);

  port = kb_smb_transport();

  hotfix_security_warning();
  hotfix_check_fversion_end();
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, hotfix_get_audit_report());
}

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_mar_internet_explorer.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\smb_nt_ms21_mar_internet_explorer.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/smb_nt_ms21_mar_internet_explorer.nasl

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How to Run

Here is how to run the Security Updates for Internet Explorer (March 2021) 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 Internet Explorer (March 2021) plugin ID 147228.
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_mar_internet_explorer.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a smb_nt_ms21_mar_internet_explorer.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_mar_internet_explorer.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_mar_internet_explorer.nasl -t <IP/HOST>

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References

MSKB | Microsoft Knowledge Base:

5000800, 5000841, 5000844, 5000847, 5000848

MSFT | Microsoft Security Bulletin:

MS21-5000800, MS21-5000841, MS21-5000844, MS21-5000847, MS21-5000848

IAVA | Information Assurance Vulnerability Alert:

2021-A-0130-S

See also:

Similar and related Nessus plugins:

147226 - KB5000802: Windows Security Update (March 2021)
147222 - KB5000803: Windows Security Update (March 2021)
147230 - KB5000807: Windows 10 March 2021 Security Update
147220 - KB5000808: Windows 10 Version 1909 March 2021 Security Update
147224 - KB5000809: Windows 10 Version 1803 March 2021 Security Update
147223 - KB5000822: Windows 10 Version 1809 and Windows Server 2019 March 2021 Security Update
147231 - KB5000851: Windows 7 and Windows Server 2008 R2 March 2021 Security Update
147217 - KB5000856: Windows Server 2008 March 2021 Security Update
147221 - KB5000840: Windows Server 2012 March 2021 Security Update
147229 - KB5000853: Windows 8.1 and Windows Server 2012 R2 March 2021 Security Update
147724 - Security Update for Microsoft Visual Studio Code ESLint Extension (March 2021)
147024 - Security Update for Microsoft Exchange Server 2010 SP 3 (March 2021)
147003 - Security Updates for Microsoft Exchange Server (March 2021)
147227 - Microsoft Windows Codecs Library Multiple Vulnerabilities (March 2021)
147750 - Security Updates for Microsoft SharePoint Server 2010 (March 2021)
147753 - Security Updates for Microsoft SharePoint Server 2013 (March 2021)
147751 - Security Updates for Microsoft Sharepoint 2016 (March 2021)
147752 - Security Updates for Microsoft SharePoint Server 2019 (March 2021)
147749 - Security Updates for Microsoft Visual Studio Products (March 2021)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file smb_nt_ms21_mar_internet_explorer.nasl version 1.8. For more plugins, visit the Nessus Plugin Library.

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Security Updates for Internet Explorer (March 2021) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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