Samba 'DNS and LDAP' DoS Vulnerability (Aug 2018)

# Copyright (C) 2018 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("1.3.6.1.4.1.25623.1.0.813785");
  script_version("2021-09-29T12:07:39+0000");
  script_cve_id("CVE-2018-1140");
  script_tag(name:"cvss_base", value:"3.3");
  script_tag(name:"cvss_base_vector", value:"AV:A/AC:L/Au:N/C:N/I:N/A:P");
  script_tag(name:"last_modification", value:"2021-09-29 12:07:39 +0000 (Wed, 29 Sep 2021)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:A/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:"2019-10-09 23:38:00 +0000 (Wed, 09 Oct 2019)");
  script_tag(name:"creation_date", value:"2018-08-17 14:46:20 +0530 (Fri, 17 Aug 2018)");
  script_name("Samba 'DNS and LDAP' DoS Vulnerability (Aug 2018)");

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

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

  script_tag(name:"insight", value:"The flaw exists due to missing null pointer
  checks.");

  script_tag(name:"impact", value:"Successful exploitation will allow an attacker
  to conduct a denial of service attack.");

  script_tag(name:"affected", value:"Samba versions 4.8.0 onwards.");

  script_tag(name:"solution", value:"Update to version 4.8.4 or later. Please see the references for more information.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"remote_banner_unreliable");
  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2018-1140.html");
  script_xref(name:"URL", value:"https://www.samba.org/samba/history/samba-4.8.4.html");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2018 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");
  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(cpe:CPE, port:port, exit_no_version:TRUE))
  exit(0);

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

if(version_in_range(version:vers, test_version:"4.8.0", test_version2:"4.8.3"))
{
  report = report_fixed_ver( installed_version:vers, fixed_version: "4.8.4 or apply patch", install_path:loc);
  security_message( data:report, port:port);
  exit(0);
}
exit(99);