Samba DoS Vulnerability (CVE-2019-14847)

# 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:samba:samba";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.108694");
  script_version("2021-09-06T11:01:35+0000");
  script_tag(name:"last_modification", value:"2021-09-06 11:01:35 +0000 (Mon, 06 Sep 2021)");
  script_tag(name:"creation_date", value:"2019-10-30 13:40:29 +0000 (Wed, 30 Oct 2019)");
  script_tag(name:"cvss_base", value:"4.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:N/I:N/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-05-29 13:15:00 +0000 (Sat, 29 May 2021)");

  script_cve_id("CVE-2019-14847");

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

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

  script_name("Samba DoS Vulnerability (CVE-2019-14847)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2019 Greenbone Networks GmbH");
  script_family("Denial of Service");
  script_dependencies("smb_nativelanman.nasl", "gb_samba_detect.nasl");
  script_mandatory_keys("samba/smb_or_ssh/detected");

  script_tag(name:"summary", value:"Samba is prone to a 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:"Since Samba 4.0.0 Samba has implemented, in the AD DC, the 'dirsync'
  LDAP control specified in MS-ADTS '3.1.1.3.4.1.3 LDAP_SERVER_DIRSYNC_OID'.

  However, when combined with the ranged results feature specified in MS-ADTS '3.1.1.3.1.3.3 Range Retrieval
  of Attribute Values' a NULL pointer is can be de-referenced.

  This is a Denial of Service only, no further escalation of privilege is associated with this issue.");

  script_tag(name:"affected", value:"Samba 4.0.0 until Samba 4.10.9.

  Samba 4.11 is not affected as the issue was fixed as a result of Coverity static analysis, before the potential
  for denial of service became apparent.");

  script_tag(name:"solution", value:"Update to version 4.9.15, 4.10.10 or later.");

  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2019-14847.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'];
path = infos['location'];

if (version_in_range(version: version, test_version: "4.0.0", test_version2: "4.9.14")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.9.15", install_path: path);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "4.10.0", test_version2: "4.10.9")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.10.10", install_path: path);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);