Microsoft Office Word Viewer Information Disclosure Vulnerability (KB4092434)

# SPDX-FileCopyrightText: 2018 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.813293");
  script_version("2023-07-20T05:05:17+0000");
  script_cve_id("CVE-2018-8378");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_tag(name:"last_modification", value:"2023-07-20 05:05:17 +0000 (Thu, 20 Jul 2023)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-08-24 17:37:00 +0000 (Mon, 24 Aug 2020)");
  script_tag(name:"creation_date", value:"2018-08-15 11:39:50 +0530 (Wed, 15 Aug 2018)");
  script_name("Microsoft Office Word Viewer Information Disclosure Vulnerability (KB4092434)");

  script_tag(name:"summary", value:"This host is missing an important security
  update according to Microsoft KB4092434");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"The flaw exists when Microsoft Office software
  reads out of bound memory due to an uninitialized variable, which could disclose
  the contents of memory.");

  script_tag(name:"impact", value:"Successful exploitation will allow an attacker
  to view out of bound memory.");

  script_tag(name:"affected", value:"Microsoft Office Word Viewer.");

  script_tag(name:"solution", value:"The vendor has released updates. Please see the references for more information.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"executable_version");
  script_xref(name:"URL", value:"https://support.microsoft.com/en-us/help/4092434");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Windows : Microsoft Bulletins");
  script_dependencies("secpod_office_products_version_900032.nasl");
  script_mandatory_keys("SMB/Office/WordView/Version");
  script_require_ports(139, 445);
  exit(0);
}

include("smb_nt.inc");
include("host_details.inc");
include("version_func.inc");
include("secpod_smb_func.inc");

if(!os_arch = get_kb_item("SMB/Windows/Arch")){
  exit(0);
}

if("x86" >< os_arch){
  key_list = make_list("SOFTWARE\Microsoft\Windows\CurrentVersion");
}
else if("x64" >< os_arch){
  key_list =  make_list("SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion",
                        "SOFTWARE\Microsoft\Windows\CurrentVersion");
}

foreach key(key_list)
{
  propath = registry_get_sz(key:key, item:"CommonFilesDir");
  if(propath)
  {

    offPath = propath + "\Microsoft Shared\OFFICE11";
    exeVer = fetch_file_version(sysPath:offPath, file_name:"Mso.dll");
    if(exeVer && exeVer =~ "^(11\.)")
    {
      if(version_is_less(version:exeVer, test_version:"11.0.8450.0"))
      {
        report = report_fixed_ver(file_checked:offPath + "\Mso.dll",
                                  file_version:exeVer, vulnerable_range:"11.0 - 11.0.8449");
        security_message(data:report);
        exit(0);
      }
    }
  }
}