Security Updates for Microsoft Visual Studio Products (March 2021) - Nessus

High Plugin ID: 147749

This page contains detailed information about the Security Updates for Microsoft Visual Studio Products (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: 147749
Name: Security Updates for Microsoft Visual Studio Products (March 2021)
Filename: smb_nt_ms21_mar_visual_studio.nasl
Vulnerability Published: 2021-03-09
This Plugin Published: 2021-03-12
Last Modification Time: 2021-08-30
Plugin Version: 1.6
Plugin Type: local
Plugin Family: Windows : Microsoft Bulletins
Dependencies: microsoft_visual_studio_installed.nbin, ms_bulletin_checks_possible.nasl
Required KB Items [?]: installed_sw/Microsoft Visual Studio, SMB/MS_Bulletin_Checks/Possible

Vulnerability Information

Severity: High
Vulnerability Published: 2021-03-09
Patch Published: 2021-03-09
CVE [?]: CVE-2021-21300
CPE [?]: cpe:/a:microsoft:visual_studio

Synopsis

The Microsoft Visual Studio Products are missing a security update.

Description

The Microsoft Visual Studio Products are missing a security update. It is, therefore, affected by the following vulnerability:

- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-21300)

Solution

Microsoft has released the following security updates to address this issue: - Update 15.9.34 for Visual Studio 2017 - Update 16.7.13 for Visual Studio 2019 - Update 16.8.7 for Visual Studio 2019 - Update 16.9.1 for Visual Studio 2019

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 Microsoft Visual Studio Products (March 2021) vulnerability:

Metasploit: exploit/multi/http/git_lfs_clone_command_exec
[Git LFS Clone Command Exec]
GitHub: https://github.com/AlkenePan/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/CppXL/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/ETOCheney/cve-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/Faisal78123/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/Jiang59991/cve-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/Jiang59991/cve-2021-21300-plus
[CVE-2021-21300]
GitHub: https://github.com/Kirill89/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/Maskhe/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/Mochican/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/SexyBeast233/SecBooks
[CVE-2021-21300]
GitHub: https://github.com/bollwarm/SecToolSet
[CVE-2021-21300]
GitHub: https://github.com/danshuizhangyu/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/erranfenech/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/fengzhouc/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/tao-sun2/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/xiaofeihahah/CVE-2021-21300
[CVE-2021-21300]
GitHub: https://github.com/1uanWu/CVE-2021-21300
[CVE-2021-21300: Remote code exec for git]

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-2021-21300
CVSS V2 Vector: AV:N/AC:H/Au:N/C:P/I:P/A:P/E:F/RL:OF/RC:C

CVSS Base Score:	5.1 (Medium)
Impact Subscore:	6.4
Exploitability Subscore:	4.9
CVSS Temporal Score:	4.2 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	4.2 (Medium)

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

CVSS Base Score:	7.5 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.6
CVSS Temporal Score:	7.0 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.0 (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(147749);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/08/30");

  script_cve_id("CVE-2021-21300");
  script_xref(name:"IAVA", value:"2021-A-0133-S");

  script_name(english:"Security Updates for Microsoft Visual Studio Products (March 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Visual Studio Products are missing a security update.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Visual Studio Products are missing a security
update. It is, therefore, affected by the following
vulnerability:

  - A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute
    unauthorized arbitrary commands. (CVE-2021-21300)");
  # https://docs.microsoft.com/en-us/visualstudio/releasenotes/vs2017-relnotes#15.9.34
  script_set_attribute(attribute:"see_also", value:"https://www.nessus.org/u?35639538");
  # https://docs.microsoft.com/en-us/visualstudio/releases/2019/release-notes-v16.7#16.7.13
  script_set_attribute(attribute:"see_also", value:"https://www.nessus.org/u?59306b22");
  # https://docs.microsoft.com/en-us/visualstudio/releases/2019/release-notes-v16.8#16.8.7
  script_set_attribute(attribute:"see_also", value:"https://www.nessus.org/u?ceb97f0f");
  # https://docs.microsoft.com/en-us/visualstudio/releases/2019/release-notes#16.9.1
  script_set_attribute(attribute:"see_also", value:"https://www.nessus.org/u?2e4fedc9");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
 - Update 15.9.34 for Visual Studio 2017
 - Update 16.7.13 for Visual Studio 2019
 - Update 16.8.7 for Visual Studio 2019
 - Update 16.9.1 for Visual Studio 2019");
  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:F/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:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-21300");

  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:'Git LFS Clone Command Exec');
  script_set_attribute(attribute:"exploit_framework_metasploit", 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:"2021/03/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:visual_studio");
  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("ms_bulletin_checks_possible.nasl", "microsoft_visual_studio_installed.nbin");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible", "installed_sw/Microsoft Visual Studio");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include('install_func.inc');
include('smb_func.inc');
include('smb_hotfixes.inc');

get_kb_item_or_exit('installed_sw/Microsoft Visual Studio');

port = kb_smb_transport();
appname = 'Microsoft Visual Studio';
installs = get_installs(app_name:appname, exit_if_not_found:TRUE);
report = '';

foreach install (installs[1])
{
  version = install['version'];
  path = install['path'];
  prod = install['Product'];
  fix = '';

  # https://docs.microsoft.com/en-us/visualstudio/install/visual-studio-build-numbers-and-release-dates?view=vs-2017
  #
  # VS 2017
  if (prod == '2017')
  {
    fix = '15.9.28307.1440';

    if (ver_compare(ver: version, fix: fix, strict:FALSE) < 0)
    {
      report +=
        '\n  Path              : ' + path +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix +
        '\n';
    }
  }
  # https://docs.microsoft.com/en-us/visualstudio/install/visual-studio-build-numbers-and-release-dates?view=vs-2019
  #
  # VS 2019 Version 16.4
  else if (prod == '2019' && version =~ "^16\.[0-4]\.")
  {
    fix = '16.4.31026.101';
    if (ver_compare(ver: version, fix: fix, strict:FALSE) < 0)
    {
      report +=
        '\n  Path              : ' + path +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix +
        '\n';
    }
  }
  # VS 2019 Version 16.7
  else if (prod == '2019' && version =~ "^16\.[5-7]\.")
  {
    fix = '16.7.31026.100';
    if (ver_compare(ver: version, fix: fix, strict:FALSE) < 0)
    {
      report +=
        '\n  Path              : ' + path +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix +
        '\n';
    }
  }
  # VS 2019 Version 16.8
  else if (prod == '2019' && version =~ "^16\.8\.")
  {
    fix = '16.8.31025.109';
    if (ver_compare(ver: version, fix: fix, strict:FALSE) < 0)
    {
      report +=
        '\n  Path              : ' + path +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix +
        '\n';
    }
  }
  # VS 2019 Version 16.9
  else if (prod == '2019' && version =~ "^16\.9\.")
  {
    fix = '16.9.31105.61';
    if (ver_compare(ver: version, fix: fix, strict:FALSE) < 0)
    {
      report +=
        '\n  Path              : ' + path +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix +
        '\n';
    }
  }
}

hotfix_check_fversion_end();

if (empty(report))
  audit(AUDIT_INST_VER_NOT_VULN, appname);

security_report_v4(port:port, severity:SECURITY_WARNING, extra: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_visual_studio.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\smb_nt_ms21_mar_visual_studio.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/smb_nt_ms21_mar_visual_studio.nasl

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How to Run

Here is how to run the Security Updates for Microsoft Visual Studio Products (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 Microsoft Visual Studio Products (March 2021) plugin ID 147749.
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_visual_studio.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a smb_nt_ms21_mar_visual_studio.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_visual_studio.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_visual_studio.nasl -t <IP/HOST>

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References

IAVA | Information Assurance Vulnerability Alert:

2021-A-0133-S

See also:

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149540 - EulerOS 2.0 SP5 : git (EulerOS-SA-2021-1897)
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147742 - Fedora 33 : git (2021-63fcbd126e)
147815 - Fedora 32 : git (2021-ffd0b2108d)
149221 - GLSA-202104-01 : Git: User-assisted execution of arbitrary code
152154 - openSUSE 15 Security Update : git (openSUSE-SU-2021:2555-1)
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147825 - Photon OS 1.0: Git PHSA-2021-1.0-0369
147824 - Photon OS 2.0: Git PHSA-2021-2.0-0327
147821 - Photon OS 3.0: Git PHSA-2021-3.0-0207
148030 - Photon OS 4.0: Git PHSA-2021-4.0-0004
147737 - Slackware 14.0 / 14.1 / 14.2 / current : git (SSA:2021-070-01)
147436 - SUSE SLES12 Security Update : git (SUSE-SU-2021:0756-1)
147564 - SUSE SLED15 / SLES15 Security Update : git (SUSE-SU-2021:0757-1)
152157 - SUSE SLED15 / SLES15 Security Update : git (SUSE-SU-2021:2555-1)
148010 - Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : Git vulnerability (USN-4761-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file smb_nt_ms21_mar_visual_studio.nasl version 1.6. For more plugins, visit the Nessus Plugin Library.

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Security Updates for Microsoft Visual Studio Products (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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