Dovecot 2.0 < 2.3.11.3 DoS Vulnerability

# SPDX-FileCopyrightText: 2020 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:dovecot:dovecot";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.108848");
  script_version("2023-10-27T16:11:33+0000");
  script_tag(name:"last_modification", value:"2023-10-27 16:11:33 +0000 (Fri, 27 Oct 2023)");
  script_tag(name:"creation_date", value:"2020-08-13 12:10:59 +0000 (Thu, 13 Aug 2020)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-01-06 23:15:00 +0000 (Wed, 06 Jan 2021)");

  script_cve_id("CVE-2020-12100");

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

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

  script_name("Dovecot 2.0 < 2.3.11.3 DoS Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_dovecot_consolidation.nasl");
  script_mandatory_keys("dovecot/detected");

  script_tag(name:"summary", value:"Dovecot is prone to a denial of service (DoS) vulnerability.");

  script_tag(name:"insight", value:"Receiving mail with deeply nested MIME parts leads to resource
  exhaustion as Dovecot attempts to parse it.");

  script_tag(name:"impact", value:"Malicious actor can cause denial of service to mail delivery by
  repeatedly sending mails with bad content.");

  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 - 2.3.11.2.");

  script_tag(name:"solution", value:"Update to version 2.3.10.1 or later.");

  script_xref(name:"URL", value:"https://dovecot.org/pipermail/dovecot-news/2020-August/000441.html");
  script_xref(name:"URL", value:"https://dovecot.org/pipermail/dovecot-news/2020-August/000440.html");

  exit(0);
}

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

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

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

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

if (version_in_range(version: version, test_version: "2.0", test_version2: "2.3.11.2")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.3.11.3", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);