Dovecot 2.0.x < 2.0.16 Man In The Middle Vulnerability

# Copyright (C) 2019 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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CPE = "cpe:/a:dovecot:dovecot";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.114170");
  script_version("2020-12-08T08:52:45+0000");
  script_tag(name:"last_modification", value:"2020-12-08 08:52:45 +0000 (Tue, 08 Dec 2020)");
  script_tag(name:"creation_date", value:"2019-12-30 12:31:27 +0100 (Mon, 30 Dec 2019)");
  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_cve_id("CVE-2011-4318");

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

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

  script_name("Dovecot 2.0.x < 2.0.16 Man In The Middle Vulnerability");

  script_category(ACT_GATHER_INFO);

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

  script_tag(name:"summary", value:"Dovecot is prone to a man-in-the-middle vulnerability.");

  script_tag(name:"insight", value:"When SSL or StartTLS is enabled and a hostname is used to define
  the proxy destination, Dovecot does not verify that the server hostname matches a domain name in
  the subject's Common Name(CN) of the X.509 certificate, which allows man-in-the-middle attackers
  to spoof SSL servers via a valid certificate for a different hostname.");

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

  script_tag(name:"affected", value:"Dovecot versions 2.0.x before 2.0.16.");

  script_tag(name:"solution", value:"Update to version 2.0.16 or later.");

  script_xref(name:"URL", value:"https://www.dovecot.org/list/dovecot-news/2011-November/000200.html");

  exit(0);
}

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_is_greater_equal(version: version, test_version: "2.0.0") &&
    version_is_less(version: version, test_version: "2.0.16")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.0.16", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);