lesson 9: Linux Operating System Vulnerabilities and security

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Describe the fundamentals of the Linux operating system. Describe the vulnerabilities of the Linux operating system...

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Nội dung Text: lesson 9: Linux Operating System Vulnerabilities and security

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
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Crack Password ♦ /etc/passwd ♦ sc/etc/shadow Root:2bcadvr345:0:0:root: /root: /bin/bash - John The Ripper - Viper - Slurple 6
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Linux File System ♦ Ls –l ♦ -r-x-r-x-wx ♦ Chmod 777 a.txt Firewall: iptables 8
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Linux OS Vulnerabilities ♦ Nessus can be used to – Discover vulnerabilities related to SMB and NetBIOS – Enumerate shared resources – Discover the root password 12
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Linux OS Vulnerabilities ♦ Test Linux computer against common known vulnerabilities – Review the CVE and CAN information ♦ Differentiate between local attacks and remote attacks – Remote attacks are harder to perform 16
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Remote Access Attacks on Linux Systems ♦ Attacking a network remotely requires – Knowing what system a remote user is operating – The attacked system’s password and login accounts 19
Installing Trojan Programs ♦ Trojan programs spread as – E-mail attachments – Fake patches or security fixes that can be downloaded from the Internet ♦ Trojan program functions – Allow for remote administration – Create a FTP server on attacked machine – Steal passwords – Log all keys a user enters, and e-mail results to the attacker 20