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nessusThis script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS21_JUNE_OFFICE_SHAREPOINT_2019.NASL
HistoryJun 08, 2021 - 12:00 a.m.

Security Updates for Microsoft SharePoint Server 2019 (June 2021)

2021-06-0800:00:00
This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
52

6.6 Medium

AI Score

Confidence

High

The Microsoft SharePoint Server 2019 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

  • Microsoft SharePoint Server Remote Code Execution Vulnerability (CVE-2021-26420, CVE-2021-31963, CVE-2021-31964, CVE-2021-31966)

  • Microsoft SharePoint Server Spoofing Vulnerability (CVE-2021-31948, CVE-2021-31950)

  • Microsoft SharePoint Server Information Disclosure Vulnerability (CVE-2021-31965) Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.

#%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(150372);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/27");

  script_cve_id(
    "CVE-2021-26420",
    "CVE-2021-31948",
    "CVE-2021-31950",
    "CVE-2021-31963",
    "CVE-2021-31964",
    "CVE-2021-31965",
    "CVE-2021-31966"
  );
  script_xref(name:"MSKB", value:"5001944");
  script_xref(name:"MSFT", value:"MS21-5001944");
  script_xref(name:"IAVA", value:"2021-A-0277-S");

  script_name(english:"Security Updates for Microsoft SharePoint Server 2019 (June 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft SharePoint Server 2019 installation on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft SharePoint Server 2019 installation on the remote host is missing security updates. It is, therefore,
affected by multiple vulnerabilities:

  - Microsoft SharePoint Server Remote Code Execution Vulnerability 
    (CVE-2021-26420, CVE-2021-31963, CVE-2021-31964, CVE-2021-31966)

  - Microsoft SharePoint Server Spoofing Vulnerability (CVE-2021-31948, CVE-2021-31950) 

  - Microsoft SharePoint Server Information Disclosure Vulnerability (CVE-2021-31965)    
    
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/5001944");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:  
  -KB5001944");
  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:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-31966");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-31964");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/06/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/06/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/06/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:sharepoint_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) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("microsoft_sharepoint_installed.nbin", "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_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');
include('smb_reg_query.inc');
include('install_func.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

var bulletin = 'MS21-06';
var app_name = 'Microsoft SharePoint Server';

var kbs = make_list(
  '5001944'
);

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', exit_code:1);

# Get path information for Windows.
var windir = hotfix_get_systemroot();
if (isnull(windir)) exit(1, 'Failed to determine the location of %windir%.');

registry_init();
var install = get_single_install(app_name:app_name);
var kb_checks =
{
  '2019':
  { '0':
    {'Server':
      [
        {
         'kb'           : '5001944',
         'path'         : install['path'],
         'append'       : 'bin',
         'file'         : 'ascalc.dll',
         'version'      : '16.0.10375.20000',
         'product_name' : 'Microsoft SharePoint Server 2019 Core'
        }
      ]
    }
  }
};

# Get the specific product / path
var param_list = kb_checks[install['Product']][install['SP']][install['Edition']];
# audit if not affected
if(isnull(param_list)) audit(AUDIT_HOST_NOT, 'affected');
var port = kb_smb_transport();
# grab the path otherwise
var are_we_vuln = FALSE;
var vuln = FALSE;
foreach check (param_list)
{
  if (!isnull(check['version']))
  {
    var path = check['path'];
    if (!empty_or_null(check['append']))
      path = hotfix_append_path(path:check['path'], value:check['append']);
    are_we_vuln = hotfix_check_fversion(
      file:check['file'],
      version:check['version'],
      path:path,
      kb:check['kb'],
      product:check['product_name']
    );
  }
  else
  {
    var report = '\n';
    if (check['product_name'])
      report += '  Product : ' + check['product_name'] + '\n';
    if (check['kb'])
      report += '  KB : ' + check['kb'] + '\n';
    hotfix_add_report(report, kb:check['kb']);
  }

  if(are_we_vuln == HCF_OLDER) vuln = TRUE;

}
if (vuln)
{
  port = kb_smb_transport();
  replace_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);
  hotfix_security_warning();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_INST_VER_NOT_VULN, app_name);
}
VendorProductVersion
microsoftsharepoint_server