Dnsmasq < 2.26 DoS Vulnerability

# Copyright (C) 2021 Greenbone Networks GmbH
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#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
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# This program is distributed in the hope that it will be useful,
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CPE = "cpe:/a:thekelleys:dnsmasq";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.117472");
  script_version("2021-06-08T12:41:10+0000");
  script_tag(name:"last_modification", value:"2021-06-08 12:41:10 +0000 (Tue, 08 Jun 2021)");
  script_tag(name:"creation_date", value:"2021-06-08 12:37:30 +0000 (Tue, 08 Jun 2021)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");

  script_cve_id("CVE-2008-3214");

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

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

  script_name("Dnsmasq < 2.26 DoS Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Denial of Service");
  script_dependencies("gb_dnsmasq_consolidation.nasl");
  script_mandatory_keys("thekelleys/dnsmasq/detected");

  script_tag(name:"summary", value:"Dnsmasq is prone to a Denial of Service (DoS) vulnerability.");

  script_tag(name:"insight", value:"The flaw allows remote attackers to cause a denial of service
  (daemon crash) by renewing a nonexistent lease or sending a DHCPREQUEST for an IP address that is
  not in the same network, related to the DHCP NAK response from the daemon.");

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

  script_tag(name:"affected", value:"Dnsmasq prior to 2.26.");

  script_tag(name:"solution", value:"Update to version 2.26 or later.");

  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2008/06/30/7");
  script_xref(name:"URL", value:"https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/47438");
  script_xref(name:"URL", value:"https://www.thekelleys.org.uk/dnsmasq/CHANGELOG");

  exit(0);
}

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

if (isnull(port = get_app_port(cpe: CPE)))
  exit(0);

if (!infos = get_app_full(cpe: CPE, port: port, exit_no_version: TRUE))
  exit(0);

version = infos["version"];
proto = infos["proto"];
location = infos["location"];

if(version_is_less(version: version, test_version: "2.26")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.26", install_path: location);
  security_message(port: port, proto: proto, data: report);
  exit(0);
}

exit(99);