Security Updates for Microsoft Excel Products (December 2020)

#
# (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(143564);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/06");

  script_cve_id(
    "CVE-2020-17123",
    "CVE-2020-17125",
    "CVE-2020-17126",
    "CVE-2020-17127",
    "CVE-2020-17128",
    "CVE-2020-17129",
    "CVE-2020-17130"
  );
  script_xref(name:"MSKB", value:"4493148");
  script_xref(name:"MSKB", value:"4493139");
  script_xref(name:"MSKB", value:"4486754");
  script_xref(name:"MSFT", value:"MS20-4493148");
  script_xref(name:"MSFT", value:"MS20-4493139");
  script_xref(name:"MSFT", value:"MS20-4486754");
  script_xref(name:"IAVA", value:"2020-A-0556-S");
  script_xref(name:"IAVA", value:"2021-A-0017-S");
  script_xref(name:"CEA-ID", value:"CEA-2020-0138");

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

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Excel Products are affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Excel Products are missing security updates.
It is, therefore, affected by multiple vulnerabilities:

  - A remote code execution vulnerability. An attacker can
    exploit this to bypass authentication and execute
    unauthorized arbitrary commands. (CVE-2020-17123,
    CVE-2020-17125, CVE-2020-17127, CVE-2020-17128,
    CVE-2020-17129)

  - An information disclosure vulnerability. An attacker can
    exploit this to disclose potentially sensitive
    information. (CVE-2020-17126)

  - A security feature bypass vulnerability exists. An
    attacker can exploit this and bypass the security
    feature and perform unauthorized actions compromising
    the integrity of the system/application.
    (CVE-2020-17130)");
  # https://support.microsoft.com/en-us/help/4493148/security-update-for-excel-2010-december-8-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?68d763c5");
  # https://support.microsoft.com/en-us/help/4486754/security-update-for-excel-2016-december-8-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?64d44384");
  # https://support.microsoft.com/en-us/help/4493139/security-update-for-excel-2013-december-8-2020
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7ded81b7");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:  
  -KB4493148
  -KB4486754
  -KB4493139

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: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-2020-17129");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/12/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/12/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/12/08");

  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:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020-2024 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');

get_kb_item_or_exit('SMB/MS_Bulletin_Checks/Possible');

bulletin = 'MS20-12';

kbs = make_list(
  'kb4493148', //14
  'kb4493139', //15
  'kb4486754' //16
);

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', '14.0.7263.5000', 'kb', '4493148'),
  '15.0', make_array('sp', 1, 'version', '15.0.5301.1000', 'kb', '4493139'),
  '16.0', make_nested_list(make_array('sp', 0, 'version', '16.0.5095.1000', 'channel', 'MSI', 'kb', '4486754')
  )
);

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');
}