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nessusThis script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.SMB_NT_MS21_MAY_OFFICE.NASL
HistoryMay 11, 2021 - 12:00 a.m.

Security Updates for Microsoft Office Products (May 2021)

2021-05-1100:00:00
This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
115

7.5 High

AI Score

Confidence

High

The Microsoft Office Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

  • A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2021-28455, CVE-2021-31175, CVE-2021-31176, CVE-2021-31177, CVE-2021-31179, CVE-2021-31180)

  • An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive information. (CVE-2021-31174, CVE-2021-31178)

Note that Nessus has not tested for these issues 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(149401);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/02");

  script_cve_id(
    "CVE-2021-28455",
    "CVE-2021-31174",
    "CVE-2021-31175",
    "CVE-2021-31176",
    "CVE-2021-31178",
    "CVE-2021-31179",
    "CVE-2021-31180"
  );
  script_xref(name:"MSKB", value:"4464542");
  script_xref(name:"MSKB", value:"4493197");
  script_xref(name:"MSKB", value:"4493206");
  script_xref(name:"MSKB", value:"5001920");
  script_xref(name:"MSKB", value:"5001923");
  script_xref(name:"MSKB", value:"5001925");
  script_xref(name:"MSKB", value:"5001927");
  script_xref(name:"MSFT", value:"MS21-4464542");
  script_xref(name:"MSFT", value:"MS21-4493206");
  script_xref(name:"MSFT", value:"MS21-4493197");
  script_xref(name:"MSFT", value:"MS21-5001920");
  script_xref(name:"MSFT", value:"MS21-5001923");
  script_xref(name:"MSFT", value:"MS21-5001925");
  script_xref(name:"MSFT", value:"MS21-5001927");
  script_xref(name:"IAVA", value:"2021-A-0225-S");

  script_name(english:"Security Updates for Microsoft Office Products (May 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Office Products are affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office Products are missing security updates. It is, therefore, affected by multiple vulnerabilities:

  - A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute
    unauthorized arbitrary commands. (CVE-2021-28455, CVE-2021-31175, CVE-2021-31176, CVE-2021-31177,
    CVE-2021-31179, CVE-2021-31180)

  - An information disclosure vulnerability. An attacker can exploit this to disclose potentially sensitive
    information. (CVE-2021-31174, CVE-2021-31178)

Note that Nessus has not tested for these issues 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/4464542");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/4493197");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/4493206");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5001920");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5001923");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5001925");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/5001927");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address these issues:  
  -KB4464542
  -KB4493206
  -KB4493197
  -KB5001920
  -KB5001923
  -KB5001925
  -KB5001927
  
For Office 365, Office 2016 C2R, or Office 2019, ensure automatic updates are enabled or open any office app and
manually perform an update.");
  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:F/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:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-31180");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-28455");

  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:"2021/05/11");
  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:/a:microsoft:office");
  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) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("office_installed.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_func.inc');
include('smb_hotfixes.inc');
include('smb_hotfixes_fcheck.inc');
include('smb_reg_query.inc');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

var bulletin = 'MS21-05';
var kbs = make_list(
  '4464542',
  '4493197',
  '4493206',
  '5001920',
  '5001923',
  '5001925',
  '5001927'
);

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);

var vuln = FALSE;
var port = kb_smb_transport();

var office_vers = hotfix_check_office_version();
var office_sp, prod, path, kb, file, version;

# Office 2013 SP1
if (office_vers['15.0'])
{
  office_sp = get_kb_item('SMB/Office/2013/SP');
  if (!isnull(office_sp) && office_sp == 1)
  {
    prod = 'Microsoft Office 2013 SP1';

    path = hotfix_get_officecommonfilesdir(officever:'15.0');
    path = hotfix_append_path(path:path, value:'Microsoft Shared\\Office15');
    kb = '5001925';
    file = 'mso.dll';
    version = '15.0.5345.1002';
    if (hotfix_check_fversion(file:file, version:version, path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER )
      vuln = TRUE;

    path = hotfix_get_officeprogramfilesdir(officever:'15.0');
    path = hotfix_append_path(path:path, value:'Microsoft Office\\Office15');
    kb = '5001927';
    file = 'graph.exe';
    version = '15.0.5345.1000';
    if (hotfix_check_fversion(file:file, version:version, path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER )
      vuln = TRUE;

    path = hotfix_get_officecommonfilesdir(officever:'15.0');
    path = hotfix_append_path(path:path, value:'Microsoft Shared\\Office15');
    kb = '4493206';
    file = 'acecore.dll';
    version = '15.0.5345.1001';
    if (hotfix_check_fversion(file:file, version:version, path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER )
      vuln = TRUE;

    path = hotfix_get_officeprogramfilesdir(officever:'15.0');
    path = hotfix_append_path(path:path, value:'Microsoft Office\\Office15');
    kb = '4464542';
    file = 'oart.dll';
    version = '15.0.5345.1000';
    if (hotfix_check_fversion(file:file, version:version, path:path, kb:kb, bulletin:bulletin, product:prod) == HCF_OLDER )
      vuln = TRUE;
  }
}

# Office 2016
if (office_vers['16.0'])
{
  office_sp = get_kb_item('SMB/Office/2016/SP');
  if (!isnull(office_sp) && office_sp == 0)
  {
    prod = 'Microsoft Office 2016';
    
    # MSI graph.exe
    path = hotfix_get_officeprogramfilesdir(officever:'16.0');
    path = hotfix_append_path(path:path, value:'Microsoft Office\\Office16');
    if (hotfix_check_fversion(file:'graph.exe', version:'16.0.5161.1000', channel:'MSI', channel_product:'Office', path:path, kb:'5001923', bulletin:bulletin, product:prod) == HCF_OLDER)
      vuln = TRUE;
    
    # MSI mso.dll
    path = hotfix_get_officecommonfilesdir(officever:'16.0');
    path = hotfix_append_path(path:path, value:'Microsoft Shared\\Office16');
    if (hotfix_check_fversion(file:'mso.dll', version:'16.0.5161.1002', channel:'MSI', channel_product:'Office', path:path, kb:'5001920', bulletin:bulletin, product:prod) == HCF_OLDER)
      vuln = TRUE;
    
    # MSI acecore.dll
    path = hotfix_get_officecommonfilesdir(officever:'16.0');
    path = hotfix_append_path(path:path, value:'Microsoft Shared\\Office16');
    if (hotfix_check_fversion(file:'acecore.dll', version:'16.0.5161.1001', channel:'MSI', channel_product:'Office', path:path, kb:'4493197', bulletin:bulletin, product:prod) == HCF_OLDER)
      vuln = TRUE;
  }
}

if (vuln)
{
  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_HOST_NOT, 'affected');
}
VendorProductVersion
microsoftoffice

7.5 High

AI Score

Confidence

High

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