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arp_spoof's Introduction

arp_spoof

Network Infrastructure

infrastructure

공격 Flow

1. BroadCast를 날려 Sender의 MAC 주소 확보

seq-1

2. Sender가 자신의 MAC 주소 Reply

seq-2

3. Attacker가 감염된 ARP Reply 전송 -> Sender이 ARP Table 오염됨

seq-3

4. Sender가 오염된 ARP Table에 따라 모든 통신 내용을 Attacker에게 보냄

seq-4

5. Attacker는 Sender가 보낸 패킷에서 src mac과 checksum만 바꿔서 Target에게 Relay해줌

seq-5

6. Target을 통해 Attacker에게 들어오는 응답들은 src ip와 checksum을 변경해서 Sender에게 Relay 해줌

seq-6

7. Sender가 unicast로 ARP 확인을 위해 ARP Request를 날릴경우 Attack에게 오므로 바로 감염된 ARP Reply 패킷을 unicast로 Sender에게 재전송-> 오염된 ARP Table 유지

seq-7

8. Target의 ARP Table 제한시간이 다될경우 Sender에게 ARP Request를 날릴 경우 Sender의 ARP Table이 복구되고 공격은 실패(Attacker는 이것은 탐지 못함)

seq-8

9. Attacker는 양쪽에게 모두 ARP 감염 패킷을 주기적으로 보내 ARP Table이 오염된 상태를 유지하게 해야함

seq-9

10. 공격 중지시 양쪽 모두에게 정상 ARP Reply 패킷을 보내서 오염된 ARP Table을 복구한후 공격종료(네트워크 정상화)

seq-10

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