Microsoft .NET Framework DoS And Security Feature Bypass Vulnerability (KB4055000)

# 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("1.3.6.1.4.1.25623.1.0.812703");
  script_version("2025-01-21T05:37:33+0000");
  script_cve_id("CVE-2018-0764", "CVE-2018-0786");
  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:"2025-01-21 05:37:33 +0000 (Tue, 21 Jan 2025)");
  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:"2018-01-10 10:03:51 +0530 (Wed, 10 Jan 2018)");
  script_name("Microsoft .NET Framework DoS And Security Feature Bypass Vulnerability (KB4055000)");

  script_tag(name:"summary", value:"This host is missing a critical security
  update according to Microsoft Security Updates KB4055000.");

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

  script_tag(name:"insight", value:"Multiple flaws are due to:

  - .NET Framework (and .NET Core) components do not completely validate
    certificates.

  - .NET, and .NET core, improperly process XML documents.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote
  attackers to cause a denial of service against a .NET application and also
  to bypass certain security restrictions.");

  script_tag(name:"affected", value:"- Microsoft .NET Framework 4.6

  - Microsoft .NET Framework 4.6.1

  - Microsoft .NET Framework 4.6.2

  - Microsoft .NET Framework 4.7");

  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/4055000");
  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(win2012:1) <= 0){
  exit(0);
}

key = "SOFTWARE\Microsoft\ASP.NET\";
if(!registry_key_exists(key:key)){
  exit(0);
}

key2 = "SOFTWARE\Microsoft\.NETFramework\AssemblyFolders\";
foreach item (registry_enum_keys(key:key2))
{
  path = registry_get_sz(key:key2 + item, item:"All Assemblies In");
  if(path)
  {
    dllVer = fetch_file_version(sysPath:path, file_name:"system.identitymodel.dll");
    if(dllVer)
    {
      if(version_in_range(version:dllVer, test_version:"4.6", test_version2:"4.7.2611"))
      {
        report = 'File checked:     ' + path + "\system.identitymodel.dll" + '\n' +
                 'File version:     ' + dllVer  + '\n' +
                 'Vulnerable range: 4.6 - 4.7.2611\n' ;
        security_message(data:report);
        exit(0);
      }
    }
  }
}

exit(0);