Microsoft Windows SMB Registry : Dial-In Enabled

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
 script_id(11458);
 script_version("$Revision: 1.15 $");
 script_cvs_date("$Date: 2015/01/12 17:12:48 $");

 script_name(english:"Microsoft Windows SMB Registry : Dial-In Enabled");
 script_summary(english:"Determines the value of a remote key");

 script_set_attribute(attribute:"synopsis", value:"Dial-in access is enabled.");
 script_set_attribute(attribute:"description", value:
"Dial-in access is enabled on the remote Windows host. Provided a modem
is installed, attackers may be able to dial into this host, bypassing
firewall restrictions, and gaining access to the internal network.");
 script_set_attribute(attribute:"solution", value:
"Edit the registry and set the value of the registry key
'HKLM\Software\Microsoft\Windows\Policies\Network\nodialin' to 1.");
 script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:S/C:P/I:P/A:P");

 script_set_attribute(attribute:"plugin_publication_date", value:"2003/03/24");

 script_set_attribute(attribute:"plugin_type", value:"local");
 script_end_attributes();

 script_category(ACT_GATHER_INFO);

 script_copyright(english:"This script is Copyright (C) 2003-2015 Tenable Network Security, Inc.");
 script_family(english:"Windows");
 script_dependencies("netbios_name_get.nasl", "smb_login.nasl", "smb_registry_access.nasl");
 script_require_keys("SMB/transport", "SMB/name", "SMB/login", "SMB/password", "SMB/registry_access");
 script_require_ports(139, 445);
 exit(0);
}


include("audit.inc");
include("smb_func.inc");

login	= kb_smb_login();
pass	= kb_smb_password();
domain  = kb_smb_domain();
port	= kb_smb_transport();

if(! smb_session_init()) audit(AUDIT_FN_FAIL, "smb_session_init");

r = NetUseAdd(login:login, password:pass, domain:domain, share:"IPC$");
if ( r != 1 )
{
 NetUseDel();
 audit(AUDIT_SHARE_FAIL, "IPC$");
}

hklm = RegConnectRegistry(hkey:HKEY_LOCAL_MACHINE);
if ( isnull(hklm) )
{
 NetUseDel();
 audit(AUDIT_REG_FAIL);
}


key = "Software\Microsoft\Windows\Policies\Network";
item = "NoDialIn";

key_h = RegOpenKey(handle:hklm, key:key, mode:MAXIMUM_ALLOWED);
if ( ! isnull(key_h) )
{
 value = RegQueryValue(handle:key_h, item:item);

 if (!isnull (value) && (value[1] == 0))
   security_warning(port);

 RegCloseKey (handle:key_h);
}

RegCloseKey (handle:hklm);
NetUseDel ();