Microsoft Windows Web Media Extensions Library RCE (May 2021) - Nessus

High Plugin ID: 149388

This page contains detailed information about the Microsoft Windows Web Media Extensions Library RCE (May 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: 149388
Name: Microsoft Windows Web Media Extensions Library RCE (May 2021)
Filename: smb_nt_ms21_may_web_media.nasl
Vulnerability Published: 2021-05-11
This Plugin Published: 2021-05-11
Last Modification Time: 2021-05-12
Plugin Version: 1.3
Plugin Type: local
Plugin Family: Windows
Dependencies: smb_hotfixes.nasl, wmi_enum_windows_app_store.nbin
Required KB Items [?]: SMB/Registry/Enumerated, WMI/Windows App Store/Enumerated

Vulnerability Information

Severity: High
Vulnerability Published: 2021-05-11
Patch Published: 2021-05-11
CVE [?]: CVE-2021-28465
CPE [?]: cpe:/o:microsoft:windows

Synopsis

The Windows app installed on the remote host is affected by a remote code execution vulnerability.

Description

The Windows 'Web Media Extensions' app installed on the remote host is affected by a remote code execution vulnerability. An attacker who successfully exploited the vulnerability could execute arbitrary code. Exploitation of the vulnerability requires that a program process a specially crafted file. (CVE-2021-28465)

Solution

Upgrade to app version 1.0.40831.0, or later via the Microsoft Store.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the Microsoft Windows Web Media Extensions Library RCE (May 2021) vulnerability:

GitHub: https://github.com/JamesGeee/CVE-2021-28465
[CVE-2021-28465: PoC for exploiting CVE-2021-28465]

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-2021-28465
CVSS V2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P/E:U/RL:OF/RC:C

CVSS Base Score:	6.8 (Medium)
Impact Subscore:	6.4
Exploitability Subscore:	8.6
CVSS Temporal Score:	5.0 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.0 (Medium)

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

CVSS Base Score:	7.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.8
CVSS Temporal Score:	6.8 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.8 (Medium)

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Plugin Source

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

include('deprecated_nasl_level.inc');

include('compat.inc');

if (description)
{
  script_id(149388);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/05/12");

  script_cve_id("CVE-2021-28465");

  script_name(english:"Microsoft Windows Web Media Extensions Library RCE (May 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 'Web Media Extensions' app installed on the remote host is affected by a remote code execution
vulnerability. An attacker who successfully exploited the vulnerability could execute arbitrary code.  Exploitation of
the vulnerability requires that a program process a specially crafted file. (CVE-2021-28465)");
  script_set_attribute(attribute:"see_also", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-28465");
  script_set_attribute(attribute:"solution", value:
"Upgrade to app version 1.0.40831.0, or later via the Microsoft Store.");
  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:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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-2021-28465");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/05/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/11");

  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 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("smb_hotfixes.nasl", "wmi_enum_windows_app_store.nbin");
  script_require_keys("SMB/Registry/Enumerated", "WMI/Windows App Store/Enumerated");
  script_require_ports(139, 445);

  exit(0);
}

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

apps = ['Microsoft.WebMediaExtensions'];

app_info = vcf::microsoft_appstore::get_app_info(app_list:apps);

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

constraints = [
    { 'fixed_version' : '1.0.40831.0'}
];

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_may_web_media.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\smb_nt_ms21_may_web_media.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/smb_nt_ms21_may_web_media.nasl

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How to Run

Here is how to run the Microsoft Windows Web Media Extensions Library RCE (May 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 plugin family.
On the right side table select Microsoft Windows Web Media Extensions Library RCE (May 2021) plugin ID 149388.
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_may_web_media.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a smb_nt_ms21_may_web_media.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_may_web_media.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_may_web_media.nasl -t <IP/HOST>

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References

See also:

Similar and related Nessus plugins:

149384 - Security Update for Microsoft Visual Studio Code Remote Containers Extension (May 2021)
149383 - KB5003169: Windows 10 version 1909 Security Update (May 2021)
149382 - KB5003171: Windows 10 version 1809 / Windows Server 2019 Security Update (May 2021)
149396 - KB5003172: Windows 10 version 1507 LTS Security Update (May 2021)
149398 - KB5003173: Windows 10 version 2004 / Windows 10 version 20H2 Security Update (May 2021)
149391 - KB5003174: Windows 10 version 1803 Security Update (May 2021)
149390 - KB5003197: Windows 10 1607 / Windows Server 2016 Security Update (May 2021)
149440 - KB5003208: Windows Server 2012 Security Update (May 2021)
149389 - KB5003210: Windows Server 2008 Security Update (May 2021)
149392 - KB5003233: Windows Server 2008 R2 Security Update (May 2021)
149397 - Security Updates for Microsoft Excel Products (May 2021)
149393 - Security Updates for Exchange (May 2021)
149386 - Security Updates for Internet Explorer (May 2021)
149401 - Security Updates for Microsoft Office Products (May 2021)
149395 - Security Updates for Microsoft SharePoint Foundation Server 2013 (May 2021)
149385 - Security Updates for Microsoft Sharepoint 2016 (May 2021)
149400 - Security Updates for Microsoft SharePoint Server 2019 (May 2021)
149387 - Security Updates for Microsoft Office Web Apps (May 2021)
149399 - Security Updates for Microsoft Word Products (May 2021)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file smb_nt_ms21_may_web_media.nasl version 1.3. For more plugins, visit the Nessus Plugin Library.

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Microsoft Windows Web Media Extensions Library RCE (May 2021) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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