Eclipse Jetty Vulnerability (CVE-2019-17638) - Linux

# Copyright (C) 2020 Greenbone Networks GmbH
# 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-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
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

CPE = "cpe:/a:eclipse:jetty";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.144238");
  script_version("2021-08-17T06:00:55+0000");
  script_tag(name:"last_modification", value:"2021-08-17 06:00:55 +0000 (Tue, 17 Aug 2021)");
  script_tag(name:"creation_date", value:"2020-07-15 06:13:23 +0000 (Wed, 15 Jul 2020)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-06-14 18:15:00 +0000 (Mon, 14 Jun 2021)");

  script_cve_id("CVE-2019-17638");

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

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

  script_name("Eclipse Jetty Vulnerability (CVE-2019-17638) - Linux");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
  script_family("Web Servers");
  script_dependencies("gb_jetty_detect.nasl", "os_detection.nasl");
  script_mandatory_keys("jetty/detected", "Host/runs_unixoide");

  script_tag(name:"summary", value:"Eclipse Jetty is prone to a vulnerability where sensitive information about
  clients could be obtained.");

  script_tag(name:"insight", value:"In case of too large response headers, Jetty throws an exception to produce
  an HTTP 431 error. When this happens, the ByteBuffer containing the HTTP response headers is released back to
  the ByteBufferPool twice. Because of this double release, two threads can acquire the same ByteBuffer from the
  pool and while thread1 is about to use the ByteBuffer to write response1 data, thread2 fills the ByteBuffer
  with response2 data. Thread1 then proceeds to write the buffer that now contains response2 data. This results
  in client1, which issued request1 and expects responses, to see response2 which could contain sensitive data
  belonging to client2 (HTTP session ids, authentication credentials, etc.).");

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

  script_tag(name:"affected", value:"Eclipse Jetty version 9.4.27.v20200227 prior to 9.4.30.v20200611.");

  script_tag(name:"solution", value:"Update to version 9.4.30.v20200611 or later.");

  script_xref(name:"URL", value:"https://bugs.eclipse.org/bugs/show_bug.cgi?id=564984");
  script_xref(name:"URL", value:"https://github.com/eclipse/jetty.project/issues/4936");

  exit(0);
}

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

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

if (!infos = get_app_version_and_location(cpe: CPE, port: port, version_regex: "^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+",
                                          exit_no_version: TRUE))
  exit(0);

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

if (version_is_greater_equal(version: version, test_version: "9.4.27.20200227") &&
    version_is_less(version: version, test_version: "9.4.30.20200611")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.4.30.20200611", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);