Security Updates for Microsoft Office (April 2021) (macOS)

##
# (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(148539);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/06/03");

  script_cve_id("CVE-2021-28451", "CVE-2021-28453", "CVE-2021-28456");
  script_xref(name:"IAVA", value:"2021-A-0174-S");
  script_xref(name:"IAVA", value:"2021-A-0170-S");
  script_xref(name:"IAVA", value:"2021-A-0177-S");

  script_name(english:"Security Updates for Microsoft Office (April 2021) (macOS)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Office product installed on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office product installed on the remote host is missing security updates. It is, therefore, affected by
remote code execution vulnerabilities in Word and Excel as well as an information disclosure in Excel.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version   
number.");
  # https://docs.microsoft.com/en-us/officeupdates/release-notes-office-for-mac#april-13-2021
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?03c94526");
  # https://docs.microsoft.com/en-us/officeupdates/update-history-office-for-mac
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?43ed1b90");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Microsoft Office for Mac.");
  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:"2021/04/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:word");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"MacOS X Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("macosx_office_installed.nbin");
  script_require_keys("Host/MacOSX/Version");
  script_require_ports("installed_sw/Microsoft Excel", "installed_sw/Microsoft Word");

  exit(0);
}

include('vcf.inc');

var os = get_kb_item_or_exit('Host/MacOSX/Version');
var apps = make_list('Microsoft Word', 'Microsoft Excel');
var report = '';

#2019
var min_ver_19 = '16.17.0';
var fix_ver_19 = '16.48';
var fix_disp_19 = '16.48 (21041102)';

foreach var app (apps)
{
  var installs = get_installs(app_name:app);
  if (isnull(installs[1]))
    continue;

  foreach var install (installs[1])
  {
    var version = install['version'];

    if (ver_compare(ver:version, minver:min_ver_19, fix:fix_ver_19, strict:FALSE) < 0)
    {
      var app_label = app + ' for Mac 2019';
      report +=
        '\n\n  Product           : ' + app_label +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix_disp_19;
    }
  }
}
if (empty(report))
  audit(AUDIT_HOST_NOT, 'affected');

if (os =~ "^Mac OS X 10\.([0-9]([^0-9]|$)|1[0-3])")
  report += '\n  Note              : Update will require Mac OS X 10.14.0 or later.\n';

security_report_v4(severity:SECURITY_WARNING, port:0, extra:report);