Lesson 13 Date: 6/27/2018

Linux Network Security

Linux System Administration

References Ncrack Bruteforce attack on RDP, SSH & FTP using Ncrack Block SSH Server Attacks Using DenyHosts in CentOS/RHEL 5/6/7 How to install denyhosts on Ubuntu Linux 16.04 LTS Nessus installation documentation

Exercise: SSH brute force attack Exercise: Log check for login attempts Exercise: TCP wrappers Exercise: denyhosts Stack overflow Exercise with Stack overflow Package upgrades and verification Open Ports List exercise Closing Ports IP filtering firewalls (iptables) Building iptables rules Simple iptables script NAT table NAT script Exercises with iptables Port scanning exercises Vulnerability scanning exercises References Take me to the Course Website