Security Updates for Microsoft Office Compatibility Products (November 2018)

#
# (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(118924);
  script_version("1.6");
  script_cvs_date("Date: 2019/11/01");

  script_cve_id("CVE-2018-8577");
  script_bugtraq_id(105834);
  script_xref(name:"MSKB", value:"4461518");
  script_xref(name:"MSFT", value:"MS18-4461518");

  script_name(english:"Security Updates for Microsoft Office Compatibility Products (November 2018)");
  script_summary(english:"Checks for Microsoft security updates.");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Office Compatibility Products are missing a security update.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Office Compatibility 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. 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-2018-8577)");
  # https://support.microsoft.com/en-us/help/4461518/description-of-the-security-update-for-microsoft-office-compatibility
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?54812cc3");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released KB4461518 to address this issue.");
  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-2018-8577");

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

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

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

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

  script_copyright(english:"This script is Copyright (C) 2018-2019 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("misc_func.inc");
include("audit.inc");
include("smb_func.inc");
include("smb_hotfixes.inc");
include("smb_hotfixes_fcheck.inc");

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = "MS18-11";
kbs = make_list('4461518');

vuln = FALSE;

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

# only applies to Windows Embedded POSReady 2009
winver = get_kb_item_or_exit("SMB/WindowsVersion", exit_code:1);
productname = get_kb_item_or_exit("SMB/ProductName", exit_code:1);
if (winver != "5.1" || productname != "Windows Embedded POSReady")
  audit(AUDIT_OS_SP_NOT_VULN);

####################################################################
#  Office Compatibility Pack
####################################################################
installs = get_kb_list("SMB/Office/ExcelCnv/*/ProductPath");
foreach install (keys(installs))
{
  path = installs[install];
  path = ereg_replace(pattern:'^(.+)\\\\[^\\\\]+\\.exe$', replace:"\1\", string:path, icase:TRUE);

  kb = "4461518";
  file = "excelcnv.exe";
  version = "12.0.6804.5000";
  min_version = "12.0.0.0";
  product = "Microsoft Office Compatibility Pack";
  if (hotfix_check_fversion(path:path, file:file, version:version, kb:kb, min_version:min_version, product:product) == HCF_OLDER)
  {
    vuln = TRUE;
    break;
  }
}

if(vuln)
{
  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');
}