Tests if all Registry entrys set to prevent SYN-Attacks at an IIS Server (win)

2010-04-27T00:00:00
ID OPENVAS:96027
Type openvas
Reporter Copyright (c) 2009 Greenbone Networks GmbH
Modified 2017-09-05T00:00:00

Description

Tests if all Registry entrys set to prevent SYN-Attacks at an IIS Server.

                                        
                                            ###############################################################################
# OpenVAS Vulnerability Test
# $Id: GSHB_WMI_IIS_Protect_SynAttack.nasl 7061 2017-09-05 11:50:40Z teissa $
#
# Tests if all Registry entrys set to prevent SYN-Attacks at an IIS Server (win)
#
# Authors:
# Thomas Rotter <T.Rotter@dn-systems.de>
#
# Copyright:
# Copyright (c) 2009 Greenbone Networks GmbH, http://www.greenbone.net
#
# Set in an Workgroup Environment under Vista with enabled UAC this DWORD to access WMI:
# HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\system\LocalAccountTokenFilterPolicy to 1
#
#
# 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.
###############################################################################

tag_summary = "Tests if all Registry entrys set to prevent SYN-Attacks at an IIS Server.";

if(description)
{
  script_id(96027);
  script_version("$Revision: 7061 $");
  script_tag(name:"last_modification", value:"$Date: 2017-09-05 13:50:40 +0200 (Tue, 05 Sep 2017) $");
  script_tag(name:"creation_date", value:"2010-04-27 10:02:59 +0200 (Tue, 27 Apr 2010)");
  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:N");
  script_tag(name:"qod_type", value:"registry");  
  script_name("Tests if all Registry entrys set to prevent SYN-Attacks at an IIS Server (win)");


  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (c) 2009 Greenbone Networks GmbH");
  script_family("IT-Grundschutz");
  script_mandatory_keys("Compliance/Launch/GSHB");
  script_mandatory_keys("Tools/Present/wmi");
   
#  script_require_ports(139, 445);
  script_dependencies("secpod_reg_enum.nasl", "GSHB_WMI_OSInfo.nasl");
  script_tag(name : "summary" , value : tag_summary);
  exit(0);
}

include("http_func.inc");

host    = get_host_ip();
usrname = get_kb_item("SMB/login");
domain  = get_kb_item("SMB/domain");
if (domain){
  usrname = domain + '\\' + usrname;
}
passwd  = get_kb_item("SMB/password");
OSVER = get_kb_item("WMI/WMI_OSVER");

if(!OSVER || OSVER >< "none"){
    val ="error";
    set_kb_item(name:"WMI/IISSynAttack", value:val);
    set_kb_item(name:"WMI/IISSynAttack/log", value:"No access to SMB host.\nFirewall is activated or there is not a Windows system.");
    set_kb_item(name:"WMI/TcpMaxConnectResponseRetransmissions", value:val);
    set_kb_item(name:"WMI/BacklogIncrement", value:val);
    set_kb_item(name:"WMI/MaxConnBackLog", value:val);
    set_kb_item(name:"WMI/EnableDynamicBacklog", value:val);
    set_kb_item(name:"WMI/MinimumDynamicBacklog", value:val);
    set_kb_item(name:"WMI/MaximumDynamicBacklog", value:val);
    set_kb_item(name:"WMI/DynamicBacklogGrowthDelta", value:val);
    exit(0);
}

handle = wmi_connect(host:host, username:usrname, password:passwd);
handlereg = wmi_connect_reg(host:host, username:usrname, password:passwd);

if(!handle){
    val ="error";
    set_kb_item(name:"WMI/IISSynAttack", value:val);
    set_kb_item(name:"WMI/IISSynAttack/log", value:"wmi_connect: WMI Connect failed.");
    set_kb_item(name:"WMI/TcpMaxConnectResponseRetransmissions", value:val);
    set_kb_item(name:"WMI/BacklogIncrement", value:val);
    set_kb_item(name:"WMI/MaxConnBackLog", value:val);
    set_kb_item(name:"WMI/EnableDynamicBacklog", value:val);
    set_kb_item(name:"WMI/MinimumDynamicBacklog", value:val);
    set_kb_item(name:"WMI/MaximumDynamicBacklog", value:val);
    set_kb_item(name:"WMI/DynamicBacklogGrowthDelta", value:val);
    wmi_close(wmi_handle:handle);
    wmi_close(wmi_handle:handlereg);
    exit(0);
}

IISVER = wmi_reg_get_dword_val(wmi_handle:handlereg, key:"SOFTWARE\Microsoft\InetStp", val_name:"MajorVersion");

if(!IISVER){
    IISSynAttackval ="None";
    set_kb_item(name:"WMI/IISSynAttack", value:IISSynAttackval);
    set_kb_item(name:"WMI/IISSynAttack/log", value:"IT-Grundschutz: IIS ist not installed.");
#    set_kb_item(name:"WMI/TcpMaxConnectResponseRetransmissions", value:val);
#    set_kb_item(name:"WMI/BacklogIncrement", value:val);
#    set_kb_item(name:"WMI/MaxConnBackLog", value:val);
#    set_kb_item(name:"WMI/EnableDynamicBacklog", value:val);
#    set_kb_item(name:"WMI/MinimumDynamicBacklog", value:val);
#    set_kb_item(name:"WMI/MaximumDynamicBacklog", value:val);
#    set_kb_item(name:"WMI/DynamicBacklogGrowthDelta", value:val);
#    wmi_close(wmi_handle:handle);
#    wmi_close(wmi_handle:handlereg);
#    exit(0);
}


TCPMaxCon = wmi_reg_get_dword_val(wmi_handle:handlereg, key:"SYSTEM\CurrentControlSet\Services\Tcpip\Parameters", val_name:"TcpMaxConnectResponseRetransmissions");
if (TCPMaxCon != "0")TCPMaxCon = hex2dec(xvalue:TCPMaxCon);

Backlog = wmi_reg_get_dword_val(wmi_handle:handlereg, key:"SYSTEM\CurrentControlSet\Services\NetBT\Parameters", val_name:"BacklogIncrement");
if (Backlog != "0")Backlog = hex2dec(xvalue:Backlog);

MaxCon = wmi_reg_get_dword_val(wmi_handle:handlereg, key:"SYSTEM\CurrentControlSet\Services\NetBT\Parameters", val_name:"MaxConnBackLog");
if (MaxCon != "0")MaxCon = hex2dec(xvalue:MaxCon);

EnDyn = wmi_reg_get_dword_val(wmi_handle:handlereg, key:"SYSTEM\CurrentControlSet\Services\AFD\Parameters", val_name:"EnableDynamicBacklog");
if (EnDyn != "0")EnDyn = hex2dec(xvalue:EnDyn);

MinDyn = wmi_reg_get_dword_val(wmi_handle:handlereg, key:"SYSTEM\CurrentControlSet\Services\AFD\Parameters", val_name:"MinimumDynamicBacklog");
if (MinDyn != "0")MinDyn = hex2dec(xvalue:MinDyn);

MaxDyn = wmi_reg_get_dword_val(wmi_handle:handlereg, key:"SYSTEM\CurrentControlSet\Services\AFD\Parameters", val_name:"MaximumDynamicBacklog");
if (MaxDyn != "0")MaxDyn = hex2dec(xvalue:MaxDyn);

DynDelta = wmi_reg_get_dword_val(wmi_handle:handlereg, key:"SYSTEM\CurrentControlSet\Services\AFD\Parameters", val_name:"DynamicBacklogGrowthDelta");
if (DynDelta != "0")DynDelta = hex2dec(xvalue:DynDelta);

TcpMaxPortsExhausted = wmi_reg_get_dword_val(wmi_handle:handlereg, key:"SYSTEM\CurrentControlSet\Services\tcpip\Parameters", val_name:"TcpMaxPortsExhausted");
if (TcpMaxPortsExhausted != "0")TcpMaxPortsExhausted = hex2dec(xvalue:TcpMaxPortsExhausted);

val = "None";

if(!TCPMaxCon) TCPMaxCon = val;
if(!Backlog) Backlog = val;
if(!MaxCon) MaxCon = val;
if(!EnDyn) EnDyn = val;
if(!MinDyn) MinDyn = val;
if(!MaxDyn) MaxDyn = val;
if(!DynDelta) DynDelta = val;
if(!TcpMaxPortsExhausted) TcpMaxPortsExhausted = val;

set_kb_item(name:"WMI/TcpMaxConnectResponseRetransmissions", value:TCPMaxCon);
set_kb_item(name:"WMI/BacklogIncrement", value:Backlog);
set_kb_item(name:"WMI/MaxConnBackLog", value:MaxCon);
set_kb_item(name:"WMI/EnableDynamicBacklog", value:EnDyn);
set_kb_item(name:"WMI/MinimumDynamicBacklog", value:MinDyn);
set_kb_item(name:"WMI/MaximumDynamicBacklog", value:MaxDyn);
set_kb_item(name:"WMI/DynamicBacklogGrowthDelta", value:DynDelta);
set_kb_item(name:"WMI/TcpMaxPortsExhausted", value:TcpMaxPortsExhausted);
if (IISSynAttackval != "None") set_kb_item(name:"WMI/IISSynAttack", value:"tested");

wmi_close(wmi_handle:handle);
wmi_close(wmi_handle:handlereg);

exit(0);