Security Update for Microsoft Office (Auguest 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(111682);
  script_version("1.7");
  script_cvs_date("Date: 2019/11/04");

  script_cve_id("CVE-2018-8375", "CVE-2018-8382", "CVE-2018-8412");

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

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote macOS or Mac OS X host is
affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office 2016 application installed on the remote macOS
or Mac OS X host is missing a security update. It is, therefore,
affected by the following vulnerabilities:

  - An elevation of privilege vulnerability exists when the
    Microsoft AutoUpdate (MAU) application for Mac improperly
    validates updates before executing them. An attacker who
    successfully exploited the vulnerability who already has
    the ability to execute code on a system could elevate
    privileges. (CVE-2018-8412)

  - 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. (CVE-2018-8375)

  - An information disclosure vulnerability exists when
    Microsoft Excel improperly discloses the contents of its
    memory. An attacker who exploited the vulnerability could
    use the information to compromise the user's computer or
    data. (CVE-2018-8382)");
  # https://docs.microsoft.com/en-us/officeupdates/release-notes-office-for-mac
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?17ce16bb");
  # https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2018-8412
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d9d90788");
  # https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2018-8375
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5ea3bae2");
  # https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2018-8382
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1d985ef1");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released a set of patches for Microsoft Office 2016 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-2018-8375");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/08/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/08/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/14");

  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_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("Host/MacOSX/Version");
if (!os) audit(AUDIT_OS_NOT, "Mac OS X");

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

report = "";

foreach app (apps)
{
  installs = get_installs(app_name:app);
  if (isnull(installs[1])) continue;
  foreach install (installs[1])
  {
    version = install['version'];
    app_label = app;
    fix = NULL;
    fix_disp = NULL;

    if (version =~ "^16\.")
    {
      app_label += " for Mac 2016";
      fix = '16.16.0';
      fix_disp = '16.16 (18081201)';
    }

    if (fix && ver_compare(ver:version, fix:fix, strict:FALSE) < 0)
    {
      report +=
        '\n  Product           : ' + app_label +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fix_disp;

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

# Report findings.
if (!empty(report))
  security_report_v4(severity:SECURITY_HOLE, port:0, extra:report);
else
  audit(AUDIT_HOST_NOT, "affected");