NTP.org 'ntpd' Zero Origin Timestamp Regression Vulnerability (Nov 2016)

# SPDX-FileCopyrightText: 2016 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:/a:ntp:ntp";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106406");
  script_version("2024-02-23T14:36:45+0000");
  script_cve_id("CVE-2016-7431");
  script_tag(name:"last_modification", value:"2024-02-23 14:36:45 +0000 (Fri, 23 Feb 2024)");
  script_tag(name:"creation_date", value:"2016-06-03 11:18:33 +0700 (Fri, 03 Jun 2016)");
  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:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-07-12 17:15:00 +0000 (Mon, 12 Jul 2021)");
  script_name("NTP.org 'ntpd' Zero Origin Timestamp Regression Vulnerability (Nov 2016)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2016 Greenbone AG");
  script_family("General");
  script_dependencies("ntp_open.nasl", "gb_ntp_detect_lin.nasl");
  script_mandatory_keys("ntpd/version/detected");

  script_xref(name:"URL", value:"https://www.kb.cert.org/vuls/id/633847");

  script_tag(name:"summary", value:"NTP.org's reference implementation of NTP server, ntpd is prone to a zero origin timestamp regression vulnerability.");

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

  script_tag(name:"insight", value:"Zero Origin timestamp problems were fixed in ntp-4.2.8p6. However,
  subsequent timestamp validation checks introduced a regression in the handling of some Zero origin
  timestamp checks.");

  script_tag(name:"affected", value:"NTPd version 4.2.8p8 and 4.3.93 only.");

  script_tag(name:"solution", value:"Update to version 4.2.8p9, 4.3.94 or later.");

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

  exit(0);
}

include("version_func.inc");
include("revisions-lib.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"];
location = infos["location"];
proto = infos["proto"];

if (revcomp(a: version, b: "4.2.8p8") == 0) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.2.8p9", install_path: location);
  security_message(port: port, proto: proto, data: report);
  exit(0);
}

if (revcomp(a: version, b: "4.3.93") == 0) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.3.94", install_path: location);
  security_message(port: port, proto: proto, data: report);
  exit(0);
}

exit(99);