Microsoft Windows: Access to BitLocker-protected removable data drives (earlier Windows versions)

##############################################################################
# OpenVAS Vulnerability Test
# $Id: win_rm_access_bitlocker_earlier.nasl 11532 2018-09-21 19:07:30Z cfischer $
#
# Check value for Allow access to BitLocker-protected removable data drives
# from earlier versions of Windows
#
# Authors:
# Emanuel Moss <[email protected]>
#
# Copyright:
# Copyright (c) 2018 Greenbone Networks GmbH, http://www.greenbone.net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# 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.
###############################################################################

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.109409");
  script_version("$Revision: 11532 $");
  script_tag(name:"last_modification", value:"$Date: 2018-09-21 21:07:30 +0200 (Fri, 21 Sep 2018) $");
  script_tag(name:"creation_date", value:"2018-06-26 10:59:54 +0200 (Tue, 26 Jun 2018)");
  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:H/Au:S/C:N/I:N/A:N");
  script_tag(name:"qod", value:"97");
  script_name('Microsoft Windows: Access to BitLocker-protected removable data drives (earlier Windows versions)');
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (c) 2018 Greenbone Networks GmbH");
  script_family("Policy");
  script_dependencies("smb_reg_service_pack.nasl");
  script_add_preference(name:"Value", type:"entry", value:"Disabled");
  script_mandatory_keys("Compliance/Launch");
  script_tag(name:"summary", value:"This test checks the setting for policy
'Allow access to BitLocker-protected removable data drives from earlier versions
of Windows' on Windows hosts (at least Windows 7).

The setting configures whether or not removable data drives formatted with the
FAT file system can be unlocked and viewed on computers running Windows Server
2008, Windows Vista, Windows XP with Service Pack 3 (SP3), or Windows XP with
Service Pack 2 (SP2) operating systems.");
  exit(0);
}

include("smb_nt.inc");
include("policy_functions.inc");

if(!get_kb_item("SMB/WindowsVersion")){
  policy_logging(text:'Host is no Microsoft Windows System or it is not possible
to query the registry.');
  exit(0);
}

if(get_kb_item("SMB/WindowsVersion") < "6.1"){
  policy_logging(text:'Host is not at least a Microsoft Windows 7 system.
Older versions of Microsoft Windows are not supported any more.
Please update the system.');
  exit(0);
}

title = 'Allow access to BitLocker-protected removable data drives from earlier versions of Windows';
fixtext = 'Set following UI path accordingly:
Computer Configuration/Administrative Templates/Windows Components/
BitLocker Drive Encryption/Removable Data Drives/' + title;
type = 'HKLM';
key = 'Software\\Policies\\Microsoft\\FVE';
item = 'RDVDiscoveryVolumeType';
value = registry_get_sz(key:key, item:item, type:type);
default = script_get_preference('Value');

if(!value){
  value = 'Disabled';
}

if(value == default){
  compliant = 'yes';
}else{
  compliant = 'no';
}

policy_logging(text:'"' + title + '" is set to: ' + value);
policy_add_oid();
policy_set_dval(dval:default);
policy_fixtext(fixtext:fixtext);
policy_control_name(title:title);
policy_set_kb(val:value);
policy_set_compliance(compliant:compliant);

exit(0);