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ARP attacks - We are watching hackers h Z ou ei els rab rT...

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ARP Cache Poisoning ARP Cache Poisoning based Attacks based Attacks Zouheir Trabelsi We are watching hackers
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Zouheir Trabelsi 2 P l a n How ARP caches are updated? ARP Cache Poisoning Attack Rerouting Communications DoS attack MiM attack Gratuitous ARP: Duplicate IP address attack Cloning attack (MAC spoofing attack) Tools Attack scenarios Defending against ARP attacks
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Zouheir Trabelsi 3 The update of ARP caches can be done by ARP Replies or ARP Requests How ARP caches are updated?
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Zouheir Trabelsi 4 ARP Cache Update using ARP Replies Host A Host C Host B Host D IP destination Source IP = IP_B Destination MAC = MAC_A Source MAC = MAC_B Operation = 2 (reply) Destination IP = IP_A Source MAC = MAC_B Destination MAC = MAC_A Type = ARP (2054) Host B sends an ARP reply to host A Host A will update its ARP cache with the entry IP_B / MAC_B
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Zouheir Trabelsi 5 ARP Cache Update using ARP Requests Host A Host C Host B Host D IP destination Source IP = IP_A Destination MAC = 00:00:00:00:00:00 Source MAC = MAC_A Operation = 1 (Request) Destination IP = IP_B Source MAC = MAC_A Destination MAC = FF:FF:FF:FF:FF:FF Type = ARP (2054) Host A sends an ARP request to all hosts All hosts (B, C, and D) will update their ARP caches with the entry IP_A / MAC_A
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Zouheir Trabelsi 6 ARP Cache Poisoning Attack
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Zouheir Trabelsi 7 ARP Cache Poisoning Attack: Is the process of corrupting an ARP cache with fake IP/MAC entries ARP Cache Poisoning Attack is used to perform other attacks: Man-in-the-Middle (MiM) attack Denial of Service (DoS) attack
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Zouheir Trabelsi 8 Host A Host C Host B Host D IP destination Source IP = Gateway_IP Destination MAC = Any Address Source MAC = FAKE MAC Operation = 2 (Reply) Destination IP = Any Address Source MAC = Any Address Destination MAC = MAC_A Type = ARP (0x0806) ARP reply packets can be used to corrupt the ARP caches of victim hosts ARP Cache Poisoning Attack using ARP Replies C A IP MAC Gateway_IP Fake MAC ARP cache of Host A
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Zouheir Trabelsi 9 ARP Cache Poisoning Attack using ARP Requests Host A Host C Host B Host D IP destination Source IP = IP_A Destination MAC = 00:00:00:00:00:00 Source MAC = MAC_C Operation = 1 (Request) Destination IP = Any thing Source MAC = Any MAC Destination MAC = Broadcast or MAC_B Type = ARP (0x0806) Host C sends a FAKE ARP request to all hosts or only to host B All hosts or host B will update their/its ARP cache(s) with the FAKE entry IP_A / MAC_C
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Zouheir Trabelsi 10 Host A Host C Host B Host D IP MAC IP_A MAC_C ARP cache of hosts B Host C sends a FAKE ARP request to host B Host B will update its ARP cache with the FAKE entry IP_A / MAC_C Result: All the packets sent by host B to host A will go to host C ARP Cache Poisoning Attack using ARP Requests
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Zouheir Trabelsi 11 ARP Cache Poisoning Attack using ARP Requests Host A Host C Host B Host D IP destination Source IP = Gateway_IP Destination MAC = 00:00:00:00:00:00 Source MAC = Fake MAC Operation = 1 (Request) Destination IP = Any thing Source MAC = Any MAC Destination MAC = MAC_B Type = ARP (0x0806) Host C sends a FAKE ARP request to host B Router 1 IP MAC Gateway_IP Fake MAC ARP cache of host B Result : Host B cannot access the Internet
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