PRTG Network Monitor <=18.2.40.1683 Denial of Service Vulnerability

# 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("1.3.6.1.4.1.25623.1.0.113300");
  script_version("2025-12-11T05:46:19+0000");
  script_tag(name:"last_modification", value:"2025-12-11 05:46:19 +0000 (Thu, 11 Dec 2025)");
  script_tag(name:"creation_date", value:"2018-11-13 15:39:34 +0200 (Tue, 13 Nov 2018)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/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:"2020-08-24 17:37:00 +0000 (Mon, 24 Aug 2020)");

  script_tag(name:"qod_type", value:"remote_banner");

  script_tag(name:"solution_type", value:"VendorFix");

  script_cve_id("CVE-2018-19203");

  script_name("PRTG Network Monitor <=18.2.40.1683 Denial of Service Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_prtg_network_monitor_detect.nasl");
  script_mandatory_keys("prtg_network_monitor/installed");

  script_tag(name:"summary", value:"PRTG Network Monitor is prone to a denial of service (DoS) vulnerability.");
  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
  script_tag(name:"insight", value:"Remote authenticated attackers can terminate the PRTG Core Server
  via a specially crafted HTTP request.");
  script_tag(name:"affected", value:"PRTG Network Monitor through version 18.2.40.1683.");
  script_tag(name:"solution", value:"Update to version 18.2.41.1652.");

  script_xref(name:"URL", value:"https://www.ptsecurity.com/ww-en/analytics/threatscape/pt-2018-22/");
  script_xref(name:"URL", value:"http://en.securitylab.ru/lab/PT-2018-22");

  exit(0);
}

CPE = "cpe:/a:paessler:prtg_network_monitor";

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

if( ! port = get_app_port( cpe: CPE ) ) exit( 0 );
if( ! version = get_app_version( cpe: CPE, port: port ) ) exit( 0 );

if( version_is_less( version: version, test_version: "18.2.41.1652" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "18.2.41.1652" );
  security_message( data: report, port: port );
  exit( 0 );
}

exit( 99 );