Samba 4.10.0 < 4.10.5 DoS Vulnerability (CVE-2019-12436)

# SPDX-FileCopyrightText: 2019 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:samba:samba";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.142521");
  script_version("2025-09-16T05:38:45+0000");
  script_tag(name:"last_modification", value:"2025-09-16 05:38:45 +0000 (Tue, 16 Sep 2025)");
  script_tag(name:"creation_date", value:"2019-06-28 07:57:39 +0000 (Fri, 28 Jun 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:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-06-19 15:15:00 +0000 (Wed, 19 Jun 2019)");

  script_cve_id("CVE-2019-12435");

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

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

  script_name("Samba 4.10.0 < 4.10.5 DoS Vulnerability (CVE-2019-12436)");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2019 Greenbone AG");
  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 (DoS) vulnerability.");

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

  script_tag(name:"insight", value:"A user with read access to the LDAP server can crash the LDAP server process.
  Depending on the Samba version and the choice of process model, this may crash only the user's own connection.

  Specifically, while in Samba 4.10 the default is for one process per connected client, site-specific
  configuration triggers can change this.");

  script_tag(name:"affected", value:"Samba versions 4.10.x.");

  script_tag(name:"solution", value:"Update to version 4.10.5 or later.");

  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2019-12436.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: "4.10.0", test_version2: "4.10.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.10.5", install_path: path);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);