Samba Server 'CVE-2017-14746' Use-after-free Vulnerability

# SPDX-FileCopyrightText: 2017 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("1.3.6.1.4.1.25623.1.0.108294");
  script_version("2025-09-17T05:39:26+0000");
  script_cve_id("CVE-2017-14746");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"last_modification", value:"2025-09-17 05:39:26 +0000 (Wed, 17 Sep 2025)");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2022-08-16 13:01:00 +0000 (Tue, 16 Aug 2022)");
  script_tag(name:"creation_date", value:"2017-11-23 07:09:22 +0100 (Thu, 23 Nov 2017)");
  script_name("Samba Server 'CVE-2017-14746' Use-after-free Vulnerability");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("General");
  script_dependencies("smb_nativelanman.nasl", "gb_samba_detect.nasl", "gb_smb_version_detect.nasl");
  script_mandatory_keys("samba/smb_or_ssh/detected");

  script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2017-14746.html");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/101907");

  script_tag(name:"summary", value:"Samba is prone to a use-after-free 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 a client which may use an SMB1
  request to manipulate the contents of heap space.");

  script_tag(name:"impact", value:"A malicious SMB1 request can be used to control the contents
  of heap memory via a deallocated heap pointer. It is possible this may be used to compromise
  the SMB server.");

  script_tag(name:"affected", value:"Samba versions 4.0.0 to 4.5.14, 4.6.x prior to 4.6.11, 4.7.x
  prior to 4.7.3 with enabled SMBv1 support.");

  script_tag(name:"solution", value:"Update to Samba 4.5.15, 4.6.11, 4.7.3 or later.  Workaround:

  Prevent SMB1 access to the server by setting the parameter:

  server min protocol = SMB2

  to the [global] section of your smb.conf and restart smbd. This prevents a SMB1 access to the
  server. Note this could cause older clients to be unable to connect to the server.");

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

  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"];

# Workaround is to disable SMBv1 support
if( ! get_kb_item( "smb_v1/supported" ) ) exit( 0 );

if( version_in_range( version:vers, test_version:"4.0.0", test_version2:"4.5.14" ) ) {
  fix = "4.5.15";
} else if( version_in_range( version:vers, test_version:"4.6.0", test_version2:"4.6.10" ) ) {
  fix = "4.6.11";
} else if( version_in_range( version:vers, test_version:"4.7.0", test_version2:"4.7.2" ) ) {
  fix = "4.7.3";
}

if( fix ) {
  report = report_fixed_ver( installed_version:vers, fixed_version:fix, install_path:loc );
  security_message( port:port, data:report );
  exit( 0 );
}

exit( 99 );