Microsoft .NET Framework Security Bypass Vulnerability (4019114)

# SPDX-FileCopyrightText: 2017 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("1.3.6.1.4.1.25623.1.0.811037");
  script_version("2026-04-28T06:28:06+0000");
  script_cve_id("CVE-2017-0248");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_tag(name:"last_modification", value:"2026-04-28 06:28:06 +0000 (Tue, 28 Apr 2026)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-10-03 00:03:00 +0000 (Thu, 03 Oct 2019)");
  script_tag(name:"creation_date", value:"2017-05-11 11:37:20 +0530 (Thu, 11 May 2017)");
  script_tag(name:"qod_type", value:"executable_version");
  script_name("Microsoft .NET Framework Security Bypass Vulnerability (4019114)");

  script_tag(name:"summary", value:"This host is missing an important security
  update according to Microsoft KB4019114");

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

  script_tag(name:"insight", value:"Flaw exists when Microsoft .NET Framework
  (and .NET Core) components do not completely validate certificates.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote
  attackers to bypass certain security restrictions and perform unauthorized
  actions.");

  script_tag(name:"affected", value:"- Microsoft .NET Framework 3.5

  - Microsoft .NET Framework 4.5.2

  - Microsoft .NET Framework 4.6 and 4.6.1

  - Microsoft .NET Framework 4.6.2");

  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/4019114");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/98117");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 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\ASP.NET\";
if(!registry_key_exists(key:key)){
  exit(0);
}

foreach item (registry_enum_keys(key:key))
{
  dotpath = registry_get_sz(key:key + item, item:"Path");
  if(dotpath && "\Microsoft.NET\Framework" >< dotpath)
  {
    dllVer = fetch_file_version(sysPath:dotpath, file_name:"System.dll");
    if(dllVer)
    {
      ## .NET Framework 3.5 Service Pack 1 for Windows 8.1 and Windows Server 2012 R2
      ## https://support.microsoft.com/en-us/help/4014505
      if(version_in_range(version:dllVer, test_version:"2.0.50727.5700", test_version2:"2.0.50727.8758"))
      {
        VULN = TRUE;
        vulnerable_range = "2.0.50727.5700 - 2.0.50727.8758";
      }

      ##.NET Framework 4.5.2 for Windows 8.1 and Windows Server 2012 R2
      ##https://support.microsoft.com/en-us/help/4014512
      else if(version_in_range(version:dllVer, test_version:"4.0.30319.000", test_version2:"4.0.30319.36388"))
      {
        VULN = TRUE ;
        vulnerable_range = "4.0.30319.000 - 4.0.30319.36388";
      }

      ##.NET Framework 4.6 and 4.6.1 for Windows 8.1 and Windows Server 2012 R2
      ##https://support.microsoft.com/en-us/help/4014510
      else if(version_in_range(version:dllVer, test_version:"4.6", test_version2:"4.6.1098"))
      {
        VULN = TRUE ;
        vulnerable_range = "4.6 - 4.6.1098";
      }

      ##.NET Framework 4.6.2 for Windows 8.1 and Windows Server 2012 R2
      ##https://support.microsoft.com/en-us/help/4014507
      key1 = "SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Client\";
      brkVer = registry_get_sz(key:key1, item:"Version");
      if((brkVer == "4.6.01590" || brkVer == "4.6.01586" ) && dllVer =~ "^4\.6")
      {
        if(version_in_range(version:dllVer, test_version:"4.6", test_version2:"4.6.1646"))
        {
          VULN = TRUE ;
          vulnerable_range = "4.6 - 4.6.1646";
        }
      }

      if(VULN)
      {
        report = 'File checked:     ' + dotpath + "\system.dll" + '\n' +
                 'File version:     ' + dllVer  + '\n' +
                 'Vulnerable range: ' + vulnerable_range + '\n' ;
        security_message(data:report);
        exit(0);
      }
    }
  }
}