Vulnerabilities > CVE-2020-0901 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Microsoft 365 Apps and Office

#
# (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(136559);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/27");

  script_cve_id("CVE-2020-0901");
  script_xref(name:"IAVA", value:"2020-A-0199");

  script_name(english:"Security Updates for Microsoft Office Products (May 2020) (macOS)");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote macOS or Mac OS X host is affected by a 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.  (CVE-2020-0901)");
  # 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://docs.microsoft.com/en-us/officeupdates/release-notes-office-2016-mac
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?dae26676");
  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:L/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:N/AC:L/PR:N/UI:N/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-2020-0901");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/05/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/13");

  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");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:word");
  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_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020 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 Excel'
);
report = '';
#2016
min_ver_16 = '16';
fix_ver_16 = '16.16.22';
fix_disp_16 = '16.16.22 (20050901)';
#2019
min_ver_19 = '16.17.0';
fix_ver_19 = '16.37';
fix_disp_19 = '16.37 (20051002)';
foreach app (apps)
{
  installs = get_installs(app_name:app);
  if (isnull(installs[1]))
    continue;
  foreach install (installs[1])
  {
    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);

#
# (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(136511);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/27");

  script_cve_id("CVE-2020-0901");
  script_xref(name:"MSKB", value:"4484365");
  script_xref(name:"MSKB", value:"4484384");
  script_xref(name:"MSKB", value:"4484338");
  script_xref(name:"MSFT", value:"MS20-4484365");
  script_xref(name:"MSFT", value:"MS20-4484384");
  script_xref(name:"MSFT", value:"MS20-4484338");
  script_xref(name:"IAVA", value:"2020-A-0199");

  script_name(english:"Security Updates for Microsoft Excel Products (May 2020)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Excel Products are missing a security update.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Excel Products are 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.  (CVE-2020-0901)");
  # https://support.microsoft.com/en-us/help/4484365/security-update-for-excel-2013-may-12-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f5c82e2d");
  # https://support.microsoft.com/en-us/help/4484384/security-update-for-excel-2010-may-12-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?78e971c1");
  # https://support.microsoft.com/en-us/help/4484338/security-update-for-excel-2016-may-12-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?50b5bb3a");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:  
  -KB4484365
  -KB4484384
  -KB4484338

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:L/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:N/AC:L/PR:N/UI:N/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-2020-0901");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/05/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/12");

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

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("office_installed.nasl", "microsoft_office_compatibility_pack_installed.nbin", "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');
include('install_func.inc');

global_var vuln;

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

bulletin = 'MS20-05';
kbs = make_list(
  '4484365',
  '4484384',
  '4484338'
);

if (get_kb_item('Host/patch_management_checks'))
  hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE);

get_kb_item_or_exit('SMB/Registry/Enumerated', exit_code:1);

port = kb_smb_transport();

checks = make_array(
  '14.0', make_array('sp', 2, 'version', '14.0.7249.5000', 'kb', '4484384'),
  '15.0', make_array('sp', 1, 'version', '15.0.5241.1000', 'kb', '4484365'),
  '16.0', make_nested_list(make_array('sp', 0, 'version', '16.0.5005.1000', 'channel', 'MSI', 'kb', '4484338'),
    make_array('sp', 0, 'version', '16.0.4993.1001', 'channel', 'MSI', 'kb', '4484338'),
    # C2R
    make_array('version', '16.0.11328.20586', 'channel', 'Deferred'),
    make_array('version', '16.0.11929.20776', 'channel', 'Deferred', 'channel_version', '1908'),
    make_array('version', '16.0.12527.20612', 'channel', 'First Release for Deferred'),
  #  make_array('version', '16.0.12624.20588', 'channel', 'Enterprise Deferred'),
    make_array('version', '16.0.12730.20270', 'channel', 'Current'),
    # 2019
    make_array('version', '16.0.12730.20270', 'channel', '2019 Retail'),
    make_array('version', '16.0.10359.20023', 'channel', '2019 Volume')
    )
  );

if (hotfix_check_office_product(product:'Excel', checks:checks, bulletin:bulletin))
{
  replace_kb_item(name:'SMB/Missing/'+bulletin, value:TRUE);
  hotfix_security_hole();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}