Samba World Writable Files Vulnerability (CVE-2019-3870)

# 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("1.3.6.1.4.1.25623.1.0.142392");
  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:"2019-05-09 14:16:29 +0000 (Thu, 09 May 2019)");
  script_tag(name:"cvss_base", value:"3.6");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:L/Au:N/C:N/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-12-04 18:15:00 +0000 (Fri, 04 Dec 2020)");

  script_cve_id("CVE-2019-3870");

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

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

  script_name("Samba World Writable Files Vulnerability (CVE-2019-3870)");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2019 Greenbone AG");
  script_family("General");
  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 world writeable files vulnerability.");

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

  script_tag(name:"insight", value:"During the creation of a new Samba AD DC, files are created in a the private/
  subdirectory of our install location.  This directory is typically mode 0700, that is owner (root) only access.
  However in some upgraded installations it will have other permissions, such as 0755, because this was the
  default before Samba 4.8.

  Within this directory files are created with mode 0666, that is world-writable, including a sample krb5.conf and
  the list of DNS names and servicePrincipalName values to update.");

  script_tag(name:"affected", value:"Samba 4.9 and later.");

  script_tag(name:"solution", value:"Update to version 4.9.6, 4.10.2 or later.");

  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2019-3870.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: "4.9.0", test_version2: "4.9.5")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.9.6", install_path: path);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "4.10.0", test_version2: "4.10.1")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.10.2", install_path: path);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);