Samba DoS Vulnerability (CVE-2019-12435)

# 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("1.3.6.1.4.1.25623.1.0.142520");
  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 07:51:43 +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 DoS Vulnerability (CVE-2019-12435)");

  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:"The (poorly named) dnsserver RPC pipe provides administrative facilities to
  modify DNS records and zones.

  An authenticated user can crash the RPC server process via a NULL pointer de-reference.");

  script_tag(name:"affected", value:"Samba versions 4.9.x and 4.10.x.");

  script_tag(name:"solution", value:"Update to version 4.9.9, 4.10.5 or later.");

  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2019-12435.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: "4.9.8")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "4.9.9", install_path: path);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "4.10.0", test_version2: "4.10.4")) {
  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);