ProFTPD < 1.3.6b and 1.3.7rc < 1.3.7rc2 Unauthenticated Denial of Service Vulnerability

# Copyright (C) 2019 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:proftpd:proftpd";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.107734");
  script_version("2021-08-30T10:01:19+0000");
  script_cve_id("CVE-2019-18217");
  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:"last_modification", value:"2021-08-30 10:01:19 +0000 (Mon, 30 Aug 2021)");
  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:"2019-10-27 21:15:00 +0000 (Sun, 27 Oct 2019)");
  script_tag(name:"creation_date", value:"2019-10-23 11:13:50 +0200 (Wed, 23 Oct 2019)");

  script_name("ProFTPD < 1.3.6b and 1.3.7rc < 1.3.7rc2 Unauthenticated Denial of Service Vulnerability");

  script_tag(name:"summary", value:"ProFTPD is prone to a unauthenticated denial-of-service vulnerability.");

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

  script_tag(name:"insight", value:"ProFTPD allows remote unauthenticated denial-of-service due to incorrect
  handling of overly long commands because main.c in a child process enters an infinite loop.");

  script_tag(name:"affected", value:"ProFTPD before version 1.3.6b and 1.3.7rc before version 1.3.7rc2.");

  script_tag(name:"solution", value:"Update to ProFTPD version 1.3.6b / 1.3.7rc2 or later.");

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

  script_xref(name:"URL", value:"https://github.com/proftpd/proftpd/issues/846");
  script_xref(name:"URL", value:"https://github.com/proftpd/proftpd/blob/1.3.6/RELEASE_NOTES");
  script_xref(name:"URL", value:"https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2019 Greenbone Networks GmbH");
  script_family("Denial of Service");
  script_dependencies("secpod_proftpd_server_detect.nasl");
  script_mandatory_keys("ProFTPD/Installed");
  exit(0);
}

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

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

version = infos['version'];
location = infos['location'];

if( version_is_less( version:version, test_version:"1.3.6b" ) ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"1.3.6b", install_path:location );
  security_message( data:report, port:0 );
  exit( 0 );
}
else if( version =~ "^1\.3\.7rc1" ) {
  report = report_fixed_ver( installed_version:version, fixed_version:"1.3.7rc2", install_path:location );
  security_message( data:report, port:0 );
  exit( 0 );
}

exit( 99 );