Security Updates for Microsoft Word Products (April 2021)

#
# (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(148478);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/06/10");

  script_cve_id("CVE-2021-28453");
  script_xref(name:"MSKB", value:"4493208");
  script_xref(name:"MSKB", value:"4493218");
  script_xref(name:"MSKB", value:"4493198");
  script_xref(name:"MSFT", value:"MS21-4493208");
  script_xref(name:"MSFT", value:"MS21-4493218");
  script_xref(name:"MSFT", value:"MS21-4493198");
  script_xref(name:"IAVA", value:"2021-A-0177-S");

  script_name(english:"Security Updates for Microsoft Word Products (April 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Word Products are affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Word Products are missing security updates. It is, therefore, affected by a remote code execution
vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands.

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/4493208");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/4493218");
  script_set_attribute(attribute:"see_also", value:"https://support.microsoft.com/en-us/help/4493198");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:  
  -KB4493208
  -KB4493218
  -KB4493198
  
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: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-2021-28453");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/04/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/04/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:word");
  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) 2021-2022 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 = 'MS21-04';
var kbs = make_list(
  '4493208',
  '4493218',
  '4493198'
);

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 port = kb_smb_transport();

var checks = make_array(
  '14.0', make_array('sp', 2, 'version', '14.0.7268.5000', 'kb', '4493218'),
  '15.0', make_array('sp', 1, 'version', '15.0.5337.1000', 'kb', '4493208'),
  '16.0', make_nested_list(
    make_array('sp', 0, 'version', '16.0.5149.1000', 'channel', 'MSI', 'kb', '4493198')
  )
);

if (hotfix_check_office_product(product:'Word', checks:checks, bulletin:bulletin))
{
  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');
}