Network Security: Detailed info on [Full-Disclosure] Paper Release

Subject:	[Full-Disclosure] Paper Release
Date:	Thu, 29 Apr 2004 19:07:57 +0000

Hi all security experts,

We, IHC team, are security experts trying to secure the internet from
the inside.
That's why we often release papers about security and exploitation.
That time, we wrote from scratch another paper about udp smurfing.
We are pleased to teach you new things !

Regards,
for IHC team,
Lapeluche


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<div class=Section1>

<p class=MsoNormal align=right
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right'><span
style='font-family:Verdana;color:black'>Ecris par
<b>Lapeluche<o:p></o:p></b></span></p>

<p class=MsoNormal align=right
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right'><span
style='font-family:Verdana;color:black'>Membre de
l?association <b>IHCTEAM.org</b></span><b><span
style='font-family:Verdana;
color:white'> </span></b><b><span
style='font-size:8.0pt;mso-bidi-font-size:
12.0pt;font-family:Verdana;color:white'><o:p></o:p></span></b></p>

<div style='border-top:solid windowtext
3.0pt;border-left:none;border-bottom:
solid windowtext 3.0pt;border-right:none;padding:1.0pt 0cm 1.0pt 0cm'>

<h3 style='border:none;mso-border-top-alt:solid windowtext
3.0pt;mso-border-bottom-alt:
solid windowtext 3.0pt;padding:0cm;mso-padding-alt:1.0pt 0cm 1.0pt
0cm'>LE
SMURFING <span style='font-weight:normal'>?Etude attaque défense</span>
</h3>

</div>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal align=center
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:center'><span
style='font-size:8.0pt;font-family:Verdana;
color:gray'>-----------------------------------------------------------
-------------------------------------------------------------<o:p></o:p

</span></p>


<h2>Position d?attaque</h2>

<p class=MsoNormal align=center
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:center'><span
style='font-size:8.0pt;font-family:Verdana;
color:gray'>-----------------------------------------------------------
-------------------------------------------------------------<o:p></o:p

</span></p>


<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><u><span
style='mso-bidi-font-size:8.0pt;font-family:Verdana;color:gray'>I- La
théorie,
explication&nbsp;:</span></u></b><span
style='font-size:8.0pt;font-family:Verdana;
color:gray'><o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Aujourd?hui nous
allons
étudier ce qu?est le smurf.<span style="mso-spacerun: yes"> 
</span>Catégorisé
dans la rubrique du Denial of Services de pars ses méthodes de
«&nbsp;barbares&nbsp;».<o:p></o:p></span></p>

<table border=1 cellspacing=0 cellpadding=0 width=1230
style='width:922.4pt;

margin-left:3.5pt;border-collapse:collapse;border:none;mso-border-alt:s
olid windowtext .5pt;
 mso-padding-alt:0cm 3.5pt 0cm 3.5pt'>
 <tr style='height:33.65pt'>
  <td width=1230 style='width:922.4pt;border:solid windowtext
.5pt;background:
  #3366FF;padding:0cm 3.5pt 0cm 3.5pt;height:33.65pt'>
  <p class=MsoNormal align=center
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
  auto;text-align:center'><b><span
style='font-size:8.0pt;mso-bidi-font-size:
  12.0pt;font-family:Verdana;color:white'>DoS ou Denial of Service est
une
  forme d?attaque à distance qui consiste à envoyer et à submerger une
machine
  victime de paquets plus ou moins gros.</span></b><span
style='font-size:8.0pt;
  font-family:Verdana;color:white'><o:p></o:p></span></p>
  </td>
 </tr>
</table>

<p class=MsoBodyText>Beau terme que le «&nbsp;Smurf&nbsp;», mais que
veut-il
dire, et comment fonctionne-t-il, autant de questions que nous
essayerons
d?élucider dans ce petit article.</p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Le smurf consiste
à
envoyer une bonnes quantités d?informations ( paquets ) sous le nom de
la futur
victime à un réseau Broadcast. Ces paquets auront comme type un
8.<o:p></o:p></span></p>

<p class=MsoBodyText>Vous trouverez dans la RFC un tableau comme
celui-ci qui
vous permettra de comprendre les différents types de requêtes. </p>

<table border=0 cellspacing=0 cellpadding=0 width="100%"
bgcolor="#eff2fb"
 style='width:100.0%;mso-cellspacing:0cm;background:#EFF2FB'>
 <tr>
  <td style='padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span class=titre1><span
  style='font-size:9.0pt;font-family:Verdana;color:white'>Signification
des
  messages ICMP</span></span><span
style='font-size:8.5pt;font-family:Verdana;
  color:white'> <o:p></o:p></span></p>
  </td>
 </tr>
</table>

<p style='margin:0cm;margin-bottom:.0001pt;background:#3366FF'><span
style='font-size:8.5pt;font-family:Verdana;color:white;display:none;mso
-hide:
all'><![if !supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<table border=0 cellpadding=0 bgcolor="#afbbef"
style='mso-cellspacing:1.5pt;
 background:#AFBBEF'>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Type<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Code<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Message<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Signification du
message<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><b><span
style='font-size:8.5pt;
  font-family:Verdana;color:red'>8<o:p></o:p></span></b></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><b><span
style='font-size:8.5pt;
  font-family:Verdana;color:red'>0<o:p></o:p></span></b></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><b><span
style='font-size:8.5pt;
  font-family:Verdana;color:red'>Demande
d'ECHO<o:p></o:p></span></b></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><b><span
style='font-size:8.5pt;
  font-family:Verdana;color:red'>Ce message est utilisé lorsqu'on
utilise la
  commande <i>PING</i>. Cette commande, permettant de tester le réseau,
envoie
  un datagramme à un destinataire et lui demande de le
restituer<o:p></o:p></span></b></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Le réseau n'est pas
accessible<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>1<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>La machine n'est pas
accessible<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>2<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Le protocole n'est pas
accessible<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Le port n'est pas
accessible<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>4<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Fragmentation nécessaire mais
impossible à
  cause du drapeau (flag) DF<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>5<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Le routage a
échoué<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>6<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Réseau inconnu<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>7<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Machine
inconnue<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>8<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Machine non connectée au réseau
(inutilisé)<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>9<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Communication avec le réseau
interdite<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>10<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Communication avec la machine
interdite<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>11<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Réseau inaccessible pour ce
service<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>12<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Machine inaccessible pour ce
service<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>11<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>destinataire
inaccessible<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Communication interdite
(filtrage)<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>4<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Source Quench<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Le volume de données envoyé est trop
  important, le routeur envoie ce message pour prévenir qu'il sature
afin de
  demander de réduire la vitesse de transmission<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>5<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Redirection pour un
hôte<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Le routeur remarque que la route d'un
ordinateur
  n'est pas optimale et envoie l'adresse du routeur à rajouter dans la
table de
  routage de l'ordinateur<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>5<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>1<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Redirection pour un hôte et un
service donné<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Le routeur remarque que la route d'un
  ordinateur n'est pas optimale pour un service donné et envoie
l'adresse du
  routeur à rajouter dans la table de routage de
l'ordinateur<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>5<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>2<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Redirection pour un
réseau<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Le routeur remarque que la route d'un
réseau
  entier n'est pas optimale et envoie l'adresse du routeur à rajouter
dans la
  table de routage des ordinateurs du réseau<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>5<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>3<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Redirection pour un réseau et un
service
  donné<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Le routeur remarque que la route d'un
réseau
  entier n'est pas optimale pour un service donné et envoie l'adresse du
  routeur à rajouter dans la table de routage des ordinateurs du
réseau<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>11<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Temps dépassé<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Ce message est envoyé lorsque le
temps de
  vie d'un datagramme est dépassé. L'en-tête du datagramme est renvoyé
pour que
  l'utilisateur sache quel datagramme a été
détruit<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>11<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>1<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Temps de ré-assemblage de fragment
dépassé<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Ce message est envoyé lorsque le
temps de
  ré-assemblage des fragments d'un datagramme est
dépassé.<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='height:1.75pt'>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt
.75pt;height:1.75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>12<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt
.75pt;height:1.75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt
.75pt;height:1.75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>en-tête erronné<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt
.75pt;height:1.75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Ce message est envoyé lorsqu'un champ
d'un
  en-tête est erronné. La position de l'erreur est
retournée<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>13<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Timestamp
request<o:p></o:p></span></p>
  </td>
  <td style='background:#3366FF;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Une machine demande à une autre son
heure et
  sa date système (universelle)<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>14<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Timestamp reply<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>La machine réceptrice donne son heure
et sa
  date système afin que la machine émettrice puisse déterminer le temps
de
  transfert des données<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>15<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Demande d'adresse
réseau<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Ce message permet de demander au
réseau une
  adresse IP<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>16<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>réponse d'adresse
réseau<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Ce message répond au message
précédent<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>17<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Demande de masque de
sous-réseau<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Ce message permet de demander au
réseau
  unmasque de sous-réseau<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>18<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>réponse de masque de
sous-réseau<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Ce message répond au message
précédent<o:p></o:p></span></p>
  </td>
 </tr>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>17<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>Timestamp reply<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal style='background:#3366FF'><span
style='font-size:8.5pt;
  font-family:Verdana;color:white'>La machine réceptrice donne son heure
et sa
  date système afin que la machine émettrice puisse déterminer le temps
de
  transfert des données<o:p></o:p></span></p>
  </td>
 </tr>
</table>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Voici le type de
paquets
nous intéressants le n°8&nbsp;:<o:p></o:p></span></p>

<table border=0 cellpadding=0 bgcolor="#afbbef"
style='mso-cellspacing:1.5pt;
 background:#AFBBEF'>
 <tr>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal><span
style='font-size:8.5pt;font-family:Verdana'>8<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal><span
style='font-size:8.5pt;font-family:Verdana'>0<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal><span
style='font-size:8.5pt;font-family:Verdana'>Demande
  d'ECHO<o:p></o:p></span></p>
  </td>
  <td style='background:#ECF0FA;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal><span
style='font-size:8.5pt;font-family:Verdana'>Ce
  message est utilisé lorsqu'on utilise la commande <i>PING</i>. Cette
  commande, permettant de tester le réseau, envoie un datagramme à un
  destinataire et lui demande de le restituer<o:p></o:p></span></p>
  </td>
 </tr>
</table>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;mso-bidi-font-size:8.0pt;font-family:Verdana;
color:gray'>«&nbsp;Bon c?est bien mais je comprend toujours pas ce
qu?est le </span></b><b><span
style='font-size:10.0pt;mso-bidi-font-size:8.0pt;font-family:Verdana;
color:red'>Smurfing</span></b><b><span
style='font-size:10.0pt;mso-bidi-font-size:
8.0pt;font-family:Verdana;color:gray'>&nbsp;»,
explication&nbsp;:<o:p></o:p></span></b></p>

<p class=MsoBodyText3><b><u><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></u></b></p>

<p class=MsoBodyText3><b><u>Définition &nbsp;:</u></b>Le smurf consiste
à
envoyer un paquets d?informations spoofés c?est à dire au nom de la
victime </p>

<p class=MsoBodyText3 align=center style='text-align:center'>à une
adresse
broadcasts qui va entraîner une réponse de tous les ordinateurs du
réseau à la
victime. Résultat, bandes saturés, déconnexion rapide et concise?</p>

<p class=MsoBodyText3 align=center style='text-align:center'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></p>

<p class=MsoBodyText3 align=center style='text-align:center'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></p>

<p class=MsoBodyText3 align=center style='text-align:center'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></p>

<table border=0 cellspacing=1 cellpadding=0 width="99%"
bgcolor="#00ccff"
 style='width:99.8%;mso-cellspacing:.7pt;background:#00CCFF'>
 <tr>
  <td width="99%" style='width:99.84%;background:#3366FF;padding:.75pt
.75pt .75pt .75pt'>
  <p class=MsoNormal align=center
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
  auto;text-align:center'><b><i><span
style='font-size:14.0pt;mso-bidi-font-size:
  9.0pt;color:white'>RAPPEL&nbsp;:<o:p></o:p></span></i></b></p>
  <p class=MsoNormal align=center
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
  auto;text-align:center'><b><span
style='font-size:8.0pt;mso-bidi-font-size:
  9.0pt;font-family:Verdana;mso-bidi-font-family:"Courier
New";color:white'>le
  protocole TCP/IP, dans son adressage a ce qu'on appelle un broadcast
sur le
  réseau, il s'agit en général de la dernière adresse IP du réseau
parfois
  appelée 255.255.255.255. Lorsqu'un paquet est émis vers une adresse de
  broadcast, toutes les machines répondent à ce signal, par exemple un
ping
  ICMP vers cette adresse entraîne plusieurs
réponses.<o:p></o:p></span></b></p>
  <p class=MsoNormal align=center
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
  auto;text-align:center'><b><span
style='font-size:8.0pt;mso-bidi-font-size:
  12.0pt;font-family:Verdana;color:white'>Nous avons besoin sur réseau
  informatique comme audio, d?un amplificateur et distributeur, qui
redirige et
  amplifie les données entrantes sur tout le
réseau.<o:p></o:p></span></b></p>
  </td>
 </tr>
</table>

<p class=MsoBodyText3 align=center style='text-align:center'><span
style='color:white'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoBodyText3 align=center
style='text-align:center;background:#3366FF'><span
style='color:white'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoBodyText3 align=center
style='text-align:center;background:#3366FF'><span
style='mso-bidi-font-size:8.0pt;color:white'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<table border=0 cellspacing=1 cellpadding=0 width="99%"
bgcolor="#00ccff"
 style='width:99.8%;mso-cellspacing:.7pt;background:#00CCFF'>
 <tr>
  <td width="99%" style='width:99.84%;padding:.75pt .75pt .75pt .75pt'>
  <p class=MsoNormal align=center
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
  auto;text-align:center;background:#3366FF'><b><span
style='font-size:8.0pt;
  mso-bidi-font-size:7.5pt;font-family:Verdana;color:white'>Le smurf est
donc
  une attaque ICMP Flood sauf qu'ici avec un seul paquet vous créez une
masse
  extrêmement importante de <u>datagrammes reponse ICMP</u> et vous
profitez de
  la bande passante des broadcast !</span></b><b><span
style='font-size:8.0pt;
 
mso-bidi-font-size:12.0pt;font-family:Verdana;color:white'><o:p></o:p><
/span></b></p>
  </td>
 </tr>
</table>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Mais ce qui est
magnifique avec cette attaque c?est non seulement qu?elle est peut être
désastreuse pour un serveur, une personne mais aussi qu?elle allie, le
denial
of service et l?envoi de paquets ping, <o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>le spoofing au
sein de
l?émetteurs de paquets et la gestion des
broadcasts.<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Le meilleur moyen
ainsi
de faire crasher une personne, un serveur en restant
protégé.<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><u><span
style='mso-bidi-font-size:8.0pt;font-family:Verdana;color:gray'>II- La
pratique, explication&nbsp;:<o:p></o:p></span></u></b></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Tout d?abord vous
comprendrez qu?il nous faut l?adresse ip de la victime, pour cela le
hacker la
récupèrera comme il le souhaite. Ensuite, il vous faut à votre
disposition des
adresses de Broadcasts nécessaires pour l?attaque, notre hacker pourra
s?en
procurer sur différents site web notamment celui-ci (<a
href="http://www.powertech.no/smurf/";>http://www.powertech.no/smurf/</a>
).<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal align=center
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:center'><span
style='font-size:8.0pt;font-family:Verdana;
color:gray'>-----------------------------------------------------------
-------------------------------------------------------------<o:p></o:p

</span></p>


<h2>Position de défense</h2>

<p class=MsoNormal align=center
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:center'><span
style='font-size:8.0pt;font-family:Verdana;
color:gray'>-----------------------------------------------------------
-------------------------------------------------------------<o:p></o:p

</span></p>


<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p style='text-align:justify'><b><u><span
style='mso-bidi-font-size:8.0pt;
font-family:Verdana;color:gray'>I- Les parades?</span></u></b></p>

<p class=MsoBodyText>Il n'existe malheureusement pas de parade pour ce
genre
d'attaque, en effet on peut facilement détecter une attaque provenant
d'une
machine unique (correspondant à une même adresse) et bloquer le flux
d'information en provenance de cette machine, mais il est très difficile
de
distinguer, lorsque le flux est réparti sur des centaines de machines,
une
attaque d'une demande de connexion en provenance d'un client réel.
Cependant
lors d?une attaque utilisant le Smurfing, les ordinateurs envoyant
toutes les
requêtes Pong auront les mêmes masks de sous-réseaux. Il sera donc
possible
pour un administrateur réseau témoin d?une attaque de type Smurf
d?interdir
toutes les requêtes provenant de ce mask de sous réseau..</p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Mais il existe
une solution
préventive toute simple qui permettra aux utilisateurs de Linux de ce
protéger
des attaques de types smurfing, et cela rien qu?en paramétrant leurs
firewall
IPTABLES&nbsp;:<o:p></o:p></span></p>

<div align=center>

<table border=1 cellspacing=0 cellpadding=0 width=904
style='width:677.65pt;

margin-left:3.5pt;border-collapse:collapse;border:none;mso-border-alt:s
olid windowtext .5pt;
 mso-padding-alt:0cm 3.5pt 0cm 3.5pt'>
 <tr style='height:34.7pt'>
  <td width=904 valign=top style='width:677.65pt;border:solid windowtext
.5pt;
  background:#3366FF;padding:0cm 3.5pt 0cm 3.5pt;height:34.7pt'>
  <p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
  style='color:red'>[root@lapeluche /root]# </span><span
style='color:white'>iptables
  -A FORWARD -p icmp --icmp-type echo-request -m limit --limit 1/second
-J
  ACCEPT</span><span style='color:red'><o:p></o:p></span></b></p>
  </td>
 </tr>
</table>

</div>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><u><span
style='mso-bidi-font-size:8.0pt;font-family:Verdana;color:gray'>II-
Comment
utiliser les logs d?un server Cisco et de son ACL pour tracker
l?attaquant<o:p></o:p></span></u></b></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Etudions
maintenant ce
qu?un agressé doit savoir faire pour retrouver l?expéditeur et ainsi la
source
de cette attaque&nbsp;:<o:p></o:p></span></p>

<p class=MsoBodyText>Il faut tout d?abord savoir que remonter à la
source d?un
paquet spoofed est une chose plus que délicate, elle nécessite une
grande
coordinations des moyens des providers pour déterminer l?agresseur.</p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Il faut savoir
qu?aujourd?hui il est possible de logger tous les paquets traversant
votre
réseau et acceptés par votre </span><b><span
style='font-size:8.0pt;font-family:
Verdana;color:#999999'>ACL ( </span></b><b><span style='font-size:8.0pt;
mso-bidi-font-size:12.0pt;font-family:Verdana;color:#999999'>Access
Control
List ). </span></b><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Mais
quand une grande quantité de paquets doit êtres loggé, il faut savoir
que cela
peut créer une forme de chute de tension de votre CPU, c?est pourquoi il
me
semble normal que le système de logs contre se genre d?attaque
aujourd?hui doit
être limité qu?au petites attaques ( petite connections ) mais même dans
ce cas
si l?attaque est longue en temps le nombre de logs générés par votre
routeur
pourra overload votre système de logs de votre
serveur.<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Tout d?abord nous
allons
étudié les informations concernant le logging des routeurs
cisco.<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Si vous tapez
ceci dans
la configuration de votre ACL&nbsp;: «&nbsp;access-list 101 permit icmp
any any
echo log-input&nbsp;» votre système de logs enregistra tous les paquets
de
pings ICMP quand ils sont envoyés à votre adresse Mac et votre
interface. <o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Un exemple de
logs pour
un «&nbsp;multi-access&nbsp;» réseau&nbsp;:<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-GB
style='font-size:8.0pt;font-family:Verdana;color:gray;mso-ansi-language:
EN-GB'>Sep 10<span style="mso-spacerun: yes"> 
</span>23&nbsp;:17&nbsp;:01
PDT&nbsp;: %SEC-6-IPACCESSLOGDP&nbsp;: List 101 permited icmp 10.0.7.30
(FastEthernet1/0 0060.3e2f.6e41) -&gt; 10.30.248.3 (8/0), 5
packets<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Et ici un
exemple<span
style="mso-spacerun: yes">  </span>pour un réseau «&nbsp;point to
point&nbsp;»&nbsp;:<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN-GB
style='font-size:8.0pt;font-family:Verdana;color:gray;mso-ansi-language:
EN-GB'>Sep 10<span style="mso-spacerun: yes"> 
</span>23&nbsp;:17&nbsp;:01
PDT&nbsp;: %SEC-6-IPACCESSLOGDP&nbsp;: List 101 permited icmp 10.0.7.30
(BRIO
*PPP*) -&gt; 10.30.248.3 (8/0), 5 packets<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Nous étudierons
le
première exemple, pour expliquer comment faire pour remonter à partir de
ça. <o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Il signifie
que&nbsp;:<o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'>Le paquet est
venu sur
«&nbsp;Fast Ethernet1/0&nbsp;» de l?adresse MAC
«&nbsp;0060.3<sup>e</sup>2f.6<sup>e</sup>41&nbsp;»
destiné à l?adresse «&nbsp;10.30.248.3.&nbsp;». Pour déterminer
l?adresse ip de
l?adresse MAC il vous suffit d?utiliser le protocole ARP et de taper
«&nbsp;show ip arp&nbsp;»&nbsp;:<o:p></o:p></span></p>

<p class=MsoBodyText><b><span lang=EN-GB
style='mso-ansi-language:EN-GB'>lapeluche#show
ip arp 0060.3e2f.6e41<o:p></o:p></span></b></p>

<table border=1 cellspacing=0 cellpadding=0
style='border-collapse:collapse;
 border:none;mso-border-alt:solid windowtext .5pt;mso-padding-alt:0cm
3.5pt 0cm 3.5pt'>
 <tr>
  <td width=88 valign=top style='width:65.8pt;border:solid windowtext
.5pt;
  padding:0cm 3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText><b><span lang=EN-GB
style='mso-ansi-language:EN-GB'>Protocol
  Adress<o:p></o:p></span></b></p>
  </td>
  <td width=88 valign=top style='width:65.8pt;border:solid windowtext
.5pt;
  border-left:none;mso-border-left-alt:solid windowtext .5pt;padding:0cm
3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText><b><span lang=EN-GB
style='mso-ansi-language:EN-GB'>Age
  (min)<o:p></o:p></span></b></p>
  </td>
  <td width=109 valign=top style='width:81.65pt;border:solid windowtext
.5pt;
  border-left:none;mso-border-left-alt:solid windowtext .5pt;padding:0cm
3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText><b><span lang=EN-GB
style='mso-ansi-language:EN-GB'>Hardware
  Addr<o:p></o:p></span></b></p>
  </td>
  <td width=88 valign=top style='width:65.8pt;border:solid windowtext
.5pt;
  border-left:none;mso-border-left-alt:solid windowtext .5pt;padding:0cm
3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText><b><span lang=EN-GB
style='mso-ansi-language:EN-GB'>Type<o:p></o:p></span></b></p>
  </td>
  <td width=111 valign=top style='width:83.0pt;border:solid windowtext
.5pt;
  border-left:none;mso-border-left-alt:solid windowtext .5pt;padding:0cm
3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText><b><span lang=EN-GB
style='mso-ansi-language:EN-GB'>Interface<o:p></o:p></span></b></p>
  </td>
 </tr>
 <tr>
  <td width=88 valign=top style='width:65.8pt;border:solid windowtext
.5pt;
  border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm
3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText><span lang=DE
style='mso-ansi-language:DE'>Internet<span
  style="mso-spacerun: yes">  </span>10.0.183.65<span
style="mso-spacerun:
  yes">            </span><o:p></o:p></span></p>
  </td>
  <td width=88 valign=top
style='width:65.8pt;border-top:none;border-left:none;
  border-bottom:solid windowtext .5pt;border-right:solid windowtext
.5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid
windowtext .5pt;
  padding:0cm 3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText><span lang=DE
style='mso-ansi-language:DE'>32<o:p></o:p></span></p>
  </td>
  <td width=109 valign=top
style='width:81.65pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext
.5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid
windowtext .5pt;
  padding:0cm 3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText><span lang=DE
style='mso-ansi-language:DE'>0060.3e2f.6e41<span
  style="mso-spacerun: yes">  </span><o:p></o:p></span></p>
  </td>
  <td width=88 valign=top
style='width:65.8pt;border-top:none;border-left:none;
  border-bottom:solid windowtext .5pt;border-right:solid windowtext
.5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid
windowtext .5pt;
  padding:0cm 3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText>ARPA</p>
  </td>
  <td width=111 valign=top
style='width:83.0pt;border-top:none;border-left:
  none;border-bottom:solid windowtext .5pt;border-right:solid windowtext
.5pt;
  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid
windowtext .5pt;
  padding:0cm 3.5pt 0cm 3.5pt'>
  <p class=MsoBodyText>FastEthernet1/0</p>
  </td>
 </tr>
</table>

<p class=MsoBodyText>Vous pouvez remarquez que l?adresse 10.0.183.65 est
l?endroit d?où vient le paquets. Mais il vous faut un acces sur cette
machine
pour pouvoir ensuite faire la même chose est ainsi remonter jusqu?à
l?attaquant.</p>

<p class=MsoBodyText>Article de Craig A. Huegen [chuegen@quadrunner.com]
traduit et modifié par Lapeluche.</p>

<p class=MsoBodyText><b><u>«&nbsp;Je vous conseil sérieusement de lire
ses
travaux qui reste pour moi une source inépuisables de
connaissances&nbsp;»<o:p></o:p></u></b></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<pre><![if !supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></pre><pre>
</pre><pre><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></pre><pre><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></pre>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;font-family:Verdana;color:gray'><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;mso-bidi-font-size:12.0pt;font-family:Verdana;
color:white'><span style="mso-spacerun: yes"> </span></span><span
style='color:white'><o:p></o:p></span></p>

<p class=MsoNormal
style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:8.0pt;mso-bidi-font-size:12.0pt;font-family:Verdana;
color:white'>1.255.255.255 &lt;entrée&gt; </span><span
style='color:white'><o:p></o:p></span></p>

<p class=MsoNormal><![if
!supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></p>

</div>

</body>

</html>

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