Apache Tomcat JNDI Realm Authentication Weakness Vulnerability (Jul 2021) - Linux

# Copyright (C) 2021 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:apache:tomcat";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.146264");
  script_version("2021-08-24T06:00:58+0000");
  script_tag(name:"last_modification", value:"2021-08-24 06:00:58 +0000 (Tue, 24 Aug 2021)");
  script_tag(name:"creation_date", value:"2021-07-13 05:12:04 +0000 (Tue, 13 Jul 2021)");
  script_tag(name:"cvss_base", value:"5.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-07-26 17:00:00 +0000 (Mon, 26 Jul 2021)");

  script_cve_id("CVE-2021-30640");

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

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

  script_name("Apache Tomcat JNDI Realm Authentication Weakness Vulnerability (Jul 2021) - Linux");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Web Servers");
  script_dependencies("gb_apache_tomcat_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("apache/tomcat/detected", "Host/runs_unixoide");

  script_tag(name:"summary", value:"Apache Tomcat is prone to an authentication weakness
  vulnerability in the JNDI Realm.");

  script_tag(name:"insight", value:"Queries made by the JNDI Realm do not always correctly escape
  parameters. Parameter values could be sourced from user provided data (eg user names) as well as
  configuration data provided by an administrator. In limited circumstances it is possible for
  users to authenticate using variations of their user name and/or to bypass some of the protection
  provided by the LockOut Realm.");

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

  script_tag(name:"affected", value:"Apache Tomcat 7.0.x through 7.0.108, 8.5.x through 8.5.65,
  9.0.0.M1 through 9.0.45 and 10.0.0-M1 through 10.0.5.");

  script_tag(name:"solution", value:"Update to version 7.0.109, 8.5.66, 9.0.46, 10.0.6 or later.");

  script_xref(name:"URL", value:"https://lists.apache.org/thread.html/r59f9ef03929d32120f91f4ea7e6e79edd5688d75d0a9b65fd26d1fe8%40%3Cannounce.tomcat.apache.org%3E");
  script_xref(name:"URL", value:"https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.0.6");
  script_xref(name:"URL", value:"https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.46");
  script_xref(name:"URL", value:"https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.66");
  script_xref(name:"URL", value:"https://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.109");

  exit(0);
}

include("host_details.inc");
include("revisions-lib.inc");
include("version_func.inc");

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

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

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

if (version_in_range(version: version, test_version: "7.0.0", test_version2: "7.0.108")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "7.0.109", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "8.5.0", test_version2: "8.5.65")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "8.5.66", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if ((revcomp(a: version, b: "9.0.0.M1") >= 0) && (revcomp(a: version, b: "9.0.45") <= 0)) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.0.46", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if ((revcomp(a: version, b: "10.0.0.M1") >= 0) && (revcomp(a: version, b: "10.0.5") <= 0)) {
  report = report_fixed_ver(installed_version: version, fixed_version: "10.0.6", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);