Dovecot 1.1.0 - 2.2.36 and 2.3.0 - 2.3.4 Authentication Bypass Vulnerability

# Copyright (C) 2019 Greenbone Networks GmbH
#
# 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.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.112510");
  script_version("2021-08-31T08:01:19+0000");
  script_tag(name:"last_modification", value:"2021-08-31 08:01:19 +0000 (Tue, 31 Aug 2021)");
  script_tag(name:"creation_date", value:"2019-02-07 10:10:10 +0100 (Thu, 07 Feb 2019)");
  script_tag(name:"cvss_base", value:"4.9");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:S/C:P/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-06-14 03:29:00 +0000 (Fri, 14 Jun 2019)");

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

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

  script_cve_id("CVE-2019-3814");

  script_name("Dovecot 1.1.0 - 2.2.36 and 2.3.0 - 2.3.4 Authentication Bypass Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2019 Greenbone Networks GmbH");
  script_family("Privilege escalation");
  script_dependencies("gb_dovecot_consolidation.nasl");
  script_mandatory_keys("dovecot/detected");

  script_tag(name:"summary", value:"Dovecot is prone to an authentication bypass vulnerability.");

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

  script_tag(name:"insight", value:"If the provided trusted SSL certificate is missing the username field,
  Dovecot should be failing the authentication. However, the earlier versions will take the username from
  the user provided authentication fields (e.g. LOGIN command).");

  script_tag(name:"impact", value:"If there is no additional password verification, this allows the attacker
  to login as anyone else in the system.");

  script_tag(name:"affected", value:"Dovecot versions 1.1.0 through 2.2.36 and 2.3.0 through 2.3.4.");

  script_tag(name:"solution", value:"Update to version 2.2.36.1 or 2.3.4.1 respectively.");

  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2019/02/05/1");

  exit(0);
}

CPE = "cpe:/a:dovecot:dovecot";

include("host_details.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: "1.1.0", test_version2: "2.2.36")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.2.36.1", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

else if (version_in_range(version: version, test_version: "2.3.0", test_version2: "2.3.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.3.4.1", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);