Microsoft Windows DNS Server Denial of Service Vulnerability (KB4018196)

# 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("1.3.6.1.4.1.25623.1.0.811115");
  script_version("2026-04-28T06:28:06+0000");
  script_cve_id("CVE-2017-0171");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:N/A:P");
  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:H/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2017-05-25 15:33:00 +0000 (Thu, 25 May 2017)");
  script_tag(name:"creation_date", value:"2017-05-10 12:41:18 +0530 (Wed, 10 May 2017)");
  script_tag(name:"qod_type", value:"executable_version");
  script_name("Microsoft Windows DNS Server Denial of Service Vulnerability (KB4018196)");

  script_tag(name:"summary", value:"This host is missing an important security
  update according to Microsoft KB4018196");

  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 the server is
  configured to answer version queries. An attacker who successfully exploited
  this vulnerability could cause the DNS Server service to become nonresponsive.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote
  attcker to send malicious DNS queries, which results in denial of service.");

  script_tag(name:"affected", value:"Microsoft Windows Server 2008 x32/x64 Edition Service Pack 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-gb/help/4018196");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/98097");
  script_xref(name:"URL", value:"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0171");

  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_require_ports(139, 445);
  script_mandatory_keys("SMB/WindowsVersion");
  exit(0);
}


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

if(hotfix_check_sp(win2008:3, win2008x64:3) <= 0){
  exit(0);
}

sysPath = smb_get_system32root();
if(!sysPath ){
  exit(0);
}

if(!asVer = fetch_file_version(sysPath:sysPath, file_name:"Dns.exe")){
  exit(0);
}

if(version_is_less(version:asVer, test_version:"6.0.6002.19765"))
{
  Vulnerable_range = "Less than 6.0.6002.19765";
  VULN = TRUE ;
}

else if(version_in_range(version:asVer, test_version:"6.0.6002.23000", test_version2:"6.0.6002.24088"))
{
  Vulnerable_range = "6.0.6002.23000 - 6.0.6002.24088";
  VULN = TRUE ;
}


if(VULN)
{
  report = 'File checked:     ' + sysPath + "\Dns.exe" + '\n' +
           'File version:     ' + asVer  + '\n' +
           'Vulnerable range: ' + Vulnerable_range + '\n' ;
  security_message(data:report);
  exit(0);
}
exit(0);