Security Update for Microsoft Office (December 2018) (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(119614);
  script_version("1.6");
  script_cvs_date("Date: 2019/11/01");

  script_cve_id("CVE-2018-8597", "CVE-2018-8627", "CVE-2018-8628");
  script_bugtraq_id(106100, 106104, 106120);

  script_name(english:"Security Update for Microsoft Office (December 2018) (macOS)");
  script_summary(english:"Checks the version of Microsoft Office for macOS");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote macOS or Mac OS X host is
affected by remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office application installed on the remote macOS 
or Mac OS X host is missing a security update. It is, therefore, 
affected by the following vulnerability:

  - A remote code execution vulnerability exists in Microsoft Excel
  software when the software fails to properly handle objects in
  memory. An attacker who successfully exploited the vulnerability
  could run arbitrary code in the context of the current user. If
  the current user is logged on with administrative user rights, an
  attacker could take control of the affected system. An attacker
  could then install programs; view, change, or delete data; or
  create new accounts with full user rights. Users whose accounts
  are configured to have fewer user rights on the system could be
  less impacted than users who operate with administrative user
  rights.

  Exploitation of the vulnerability requires that a user
  open a specially crafted file with an affected version of
  Microsoft Excel. In an email attack scenario, an attacker could
  exploit the vulnerability by sending the specially crafted file
  to the user and convincing the user to open the file. In a
  web-based attack scenario, an attacker could host a website (or
  leverage a compromised website that accepts or hosts user-provided
  content) containing a specially crafted file designed to exploit
  the vulnerability. An attacker would have no way to force users
  to visit the website. Instead, an attacker would have to convince
  users to click a link, typically by way of an enticement in an
  email or instant message, and then convince them to open the
  specially crafted file. (CVE-2018-8597)

  - An information disclosure vulnerability exists when Microsoft
  Excel software reads out of bound memory due to an uninitialized
  variable, which could disclose the contents of memory. An attacker
  who successfully exploited the vulnerability could view out of
  bound memory.

  Exploitation of the vulnerability requires that a user open a
  specially crafted file with an affected version of Microsoft Excel
  software. (CVE-2018-8627)

  - A remote code execution vulnerability exists in Microsoft
  PowerPoint software when the software fails to properly handle
  objects in memory. An attacker who successfully exploited the
  vulnerability could run arbitrary code in the context of the
  current user. If the current user is logged on with administrative
  user rights, an attacker could take control of the affected system. 
  An attacker could then install programs; view, change, or delete
  data; or create new accounts with full user rights. Users whose
  accounts are configured to have fewer user rights on the system
  could be less impacted than users who operate with administrative
  user rights.

  Exploitation of the vulnerability requires that a user open a
  specially crafted file with an affected version of Microsoft
  Office PowerPoint software. In an email attack scenario, an
  attacker could exploit the vulnerability by sending the specially
  crafted file to the user and convincing the user to open the file.
  In a web-based attack scenario, an attacker could host a website
  (or leverage a compromised website that accepts or hosts
  user-provided content) that contains a specially crafted file
  designed to exploit the vulnerability. An attacker would have no
  way to force users to visit the website. Instead, an attacker
  would have to convince users to click a link, typically by way of
  an enticement in an email or instant message, and then convince
  them to open the specially crafted file. (CVE-2018-8628)");
  # https://docs.microsoft.com/en-us/officeupdates/release-notes-office-2016-mac#december-2018-release
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?31ee9db7");
  # https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2018-8597
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a57f509f");
  # https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2018-8627
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?25df89fa");
  # https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2018-8628
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e184b517");
  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:C/I:C/A:C");
  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-2018-8597");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/12/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/12/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/12/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:mac_os_x");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:office");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel_for_mac");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:excel");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:powerpoint");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:outlook");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:onenote");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2018-2019 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 Word", "installed_sw/Microsoft Excel", "installed_sw/Microsoft PowerPoint", "installed_sw/Microsoft OneNote", "installed_sw/Microsoft Outlook");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("install_func.inc");

os = get_kb_item_or_exit("Host/MacOSX/Version");

apps = make_list(
  "Microsoft Word",
  "Microsoft Excel",
  "Microsoft PowerPoint",
  "Microsoft OneNote",
  "Microsoft Outlook"
);

#2019
min_ver_19 = '16.17.0';
fix_ver_19 = '16.20.0';
fix_disp_19 = '16.20.0 (18120801)';

#2016
min_ver_16 = '16';
fix_ver_16 = '16.16.5';
fix_disp_16 = '16.16.5 (18120801)';
report = '';

for(i = 0; i < len(apps); i++)
{
  app = apps[i];
  installs = get_installs(app_name:app);
  if (isnull(installs[1])) continue;

  for(j = 0; j < len(installs[1]); j++)
  {
    install = installs[1][j];
    version = install['version'];
    
    if (ver_compare(ver:version, minver:min_ver_19, fix:fix_ver_19, strict:FALSE) < 0)
    {
      app_label = app + ' for Mac 2019';
      report +=
        '\n\n  Product           : ' + app_label +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix_disp_19;
    }
    else if (ver_compare(ver:version, minver:min_ver_16, fix:fix_ver_16, strict:FALSE) < 0)
    {
      app_label = app + ' for Mac 2016';
      report +=
        '\n\n  Product           : ' + app_label +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix_disp_16;
    }
  }
}

if (empty(report))
  audit(AUDIT_HOST_NOT, "affected");


if (os =~ "^Mac OS X 10\.[0-9](\.|$)")
  report += '\n  Note              : Update will require Mac OS X 10.10.0 or later.\n';

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