Microsoft .NET Framework RCE Vulnerability (KB4457034)

# 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("1.3.6.1.4.1.25623.1.0.814201");
  script_version("2023-07-20T05:05:17+0000");
  script_cve_id("CVE-2018-8421");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2018-11-05 15:46:00 +0000 (Mon, 05 Nov 2018)");
  script_tag(name:"creation_date", value:"2018-09-12 10:20:22 +0530 (Wed, 12 Sep 2018)");
  script_tag(name:"qod_type", value:"executable_version");
  script_name("Microsoft .NET Framework RCE Vulnerability (KB4457034)");

  script_tag(name:"summary", value:"This host is missing a critical security
  update according to Microsoft KB4457034.");

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

  script_tag(name:"insight", value:"The flaw exists due to an error within the
  application when Microsoft .NET Framework processes untrusted input.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote
  attackers to take control of an affected system. An attacker could then install
  programs, view, change, delete data or create new accounts with full user rights.");

  script_tag(name:"affected", value:"Microsoft .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Microsoft Windows 8.1 and Microsoft Windows Server 2012 R2.");

  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_xref(name:"URL", value:"https://support.microsoft.com/en-us/help/4457034");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/105222");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Windows : Microsoft Bulletins");
  script_dependencies("smb_reg_service_pack.nasl");
  script_mandatory_keys("SMB/WindowsVersion");
  script_require_ports(139, 445);
  exit(0);
}

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

if(hotfix_check_sp(win8_1:1, win8_1x64:1, win2012R2:1) <= 0)
  exit(0);

key = "SOFTWARE\Microsoft\.NETFramework";
if(!registry_key_exists(key:key))
  exit(0);

NetPath = registry_get_sz(key:key, item:"InstallRoot");
if(NetPath && "\Microsoft.NET\Framework" >< NetPath) {
  foreach item(registry_enum_keys(key:key)) {
    dotPath = NetPath + item;
    dllVer = fetch_file_version(sysPath:dotPath, file_name:"system.workflow.runtime.dll");

    if(!dllVer || dllVer !~ "^4\.[67]\.")
      continue;

    if(version_is_less(version:dllVer, test_version:"4.7.3180.0")) {
      report = report_fixed_ver(file_checked:dotPath + "\system.workflow.runtime.dll",
                                file_version:dllVer, vulnerable_range:"4.6 - 4.7.3180.0");
      security_message(port:0, data:report);
      exit(0);
    }
  }
  exit(99);
}

exit(0);