QNAP QTS XSS Vulnerability (QSA-21-04)

# SPDX-FileCopyrightText: 2021 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

CPE = "cpe:/o:qnap:qts";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.145778");
  script_version("2026-02-04T05:55:03+0000");
  script_tag(name:"last_modification", value:"2026-02-04 05:55:03 +0000 (Wed, 04 Feb 2026)");
  script_tag(name:"creation_date", value:"2021-04-19 04:37:10 +0000 (Mon, 19 Apr 2021)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-06-21 16:57:00 +0000 (Mon, 21 Jun 2021)");

  script_cve_id("CVE-2018-19942");

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

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

  script_name("QNAP QTS XSS Vulnerability (QSA-21-04)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_qnap_nas_http_detect.nasl");
  script_mandatory_keys("qnap/nas/qts/detected");

  script_tag(name:"summary", value:"QNAP QTS is prone to a cross-site scripting (XSS) vulnerability in
  File Station.");

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

  script_tag(name:"insight", value:"An XSS vulnerability has been reported to affect earlier versions
  of File Station. If exploited, this vulnerability allows remote attackers to inject malicious code.");

  script_tag(name:"solution", value:"See the referenced vendor advisory for a solution.");

  script_xref(name:"URL", value:"https://www.qnap.com/en/security-advisory/qsa-21-04");

  exit(0);
}

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

if(!version = get_app_version(cpe: CPE, nofork: TRUE))
  exit(0);

build = get_kb_item("qnap/nas/qts/build");

if(version_is_less(version: version, test_version: "4.2.6")) {
  report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.2.6", fixed_build: "20210327");
  security_message(port: 0, data: report);
  exit(0);
}

if(version_is_equal(version: version, test_version: "4.2.6") &&
          (!build || version_is_less(version: build, test_version: "20210327"))) {
  report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.2.6", fixed_build: "20210327");
  security_message(port: 0, data: report);
  exit(0);
}

if(version =~ "^4\.3") {
  if(version_is_less(version: version, test_version: "4.3.3.1432")) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.3.3.1432", fixed_build: "20201006");
    security_message(port: 0, data: report);
    exit(0);
  }

  if(version_is_equal(version: version, test_version: "4.3.3.1432") &&
            (!build || version_is_less(version: build, test_version: "20201006"))) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.3.3.1432", fixed_build: "20201006");
    security_message(port: 0, data: report);
    exit(0);
  }
}

if(version =~ "^4\.3\.4") {
  if(version_is_less(version: version, test_version: "4.3.4.1463")) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.3.4.1463", fixed_build: "20201006");
    security_message(port: 0, data: report);
    exit(0);
  }

  if(version_is_equal(version: version, test_version: "4.3.4.1463") &&
            (!build || version_is_less(version: build, test_version: "20201006"))) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.3.4.1463", fixed_build: "20201006");
    security_message(port: 0, data: report);
    exit(0);
  }
}

if(version =~ "^4\.3\.[56]") {
  if(version_is_less(version: version, test_version: "4.3.6.1446")) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.3.6.1446", fixed_build: "20200929");
    security_message(port: 0, data: report);
    exit(0);
  }

  if(version_is_equal(version: version, test_version: "4.3.6.1446") &&
            (!build || version_is_less(version: build, test_version: "20200929"))) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.3.6.1446", fixed_build: "20200929");
    security_message(port: 0, data: report);
    exit(0);
  }
}

if(version =~ "^4\.5\.1") {
  if(version_is_less(version: version, test_version: "4.5.1.1456")) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.5.1.1456", fixed_build: "20201015");
    security_message(port: 0, data: report);
    exit(0);
  }

  if(version_is_equal(version: version, test_version: "4.5.1.1456") &&
            (!build || version_is_less(version: build, test_version: "20201015"))) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.5.1.1456", fixed_build: "20201015");
    security_message(port: 0, data: report);
    exit(0);
  }
}

if(version =~ "^4\.5\.2") {
  if(version_is_less(version: version, test_version: "4.5.2.1566")) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.5.2.1566", fixed_build: "20210202");
    security_message(port: 0, data: report);
    exit(0);
  }

  if(version_is_equal(version: version, test_version: "4.5.2.1566") &&
            (!build || version_is_less(version: build, test_version: "20210202"))) {
    report = report_fixed_ver(installed_version: version, installed_build: build, fixed_version: "4.5.2.1566", fixed_build: "20210202");
    security_message(port: 0, data: report);
    exit(0);
  }
}

exit(99);