LESSON 9 Linux Operating System Vulnerabilities and security Objectives ♦ Describe the fundamentals of the Linux operating system ♦ Describe the vulnerabilities of the Linux operating system ♦ Describe Linux remote attacks ♦ Explain countermeasures for protecting the Linux operating system 2 Review of Linux Security Fundamentals ♦ Linux is a version of UNIX – Usually available free – Red Hat – Ubuntu – Mandrak – Sambian – Knoppix 3 4 5 Crack Password ♦ /etc/passwd ♦ sc/etc/shadow Root:2bcadvr345:0:0:root: /root: /bin/bash - John The Ripper - Viper - Slurple 6 7 Linux File System ♦ Ls –l ♦ -r-x-r-x-wx ♦ Chmod 777 a.txt Firewall: iptables 8 9 10 . LESSON 9 Linux Operating System Vulnerabilities and security Objectives ♦ Describe the fundamentals of the Linux operating system ♦ Describe the vulnerabilities of the Linux operating system ♦ Describe. operating system ♦ Describe Linux remote attacks ♦ Explain countermeasures for protecting the Linux operating system 2 Review of Linux Security Fundamentals ♦ Linux is a version of UNIX – Usually. iptables 8 9 10 11 Linux OS Vulnerabilities ♦ Nessus can be used to – Discover vulnerabilities related to SMB and NetBIOS – Enumerate shared resources – Discover the root password 12 13 14 15 Linux OS Vulnerabilities ♦ Test