Linux Security


3 Days


Security is always a concern, and with major security holes like Shellshock and Heartbleed being announced regularly, it’s more critical than ever to secure the data you are liable for. This course will walk you through the many risks and threats that exist, show you how to use best practices and other open-source tools to mitigate or counteract those threats, and teach you what you need to know to detect and recover from those attacks that do happen.


Course Overview

This advanced, completely hands-on course adopts a highly technical approach to cover important security techniques and tools. By providing visibility both into attack vectors and possible security holes, this course provides you a complete guide on how to mitigate security risks in any Linux environment.


What You’r Learn

  • How to assess security risks in your enterprise Linux environment.
  • The best techniques and tools to increase security.
  • Server hardening
  • How to deploy and use monitoring and attack detection tools.
  • How to gain visibility into possible vulnerabilities.
  • The art and science of developing your Linux security policy and response strategy.
  • How to configure your systems for compliance with HIPAA, DISA STIG, etc.

This course is designed to work with a wide range of Linux distributions, so you will be able to apply these concepts regardless of your distro.


Course Outline:

Threats and Risk Assessment

  • Classes of Attackers
  • Types of Attacks
  • Trade Offs
  • Labs

Physical Access

  • Physical Security
  • Hardware Security
  • Understanding the Linux Boot Process
  • Labs


  • Logging Overview
  • Syslog Services
  • The Linux Kernel Audit Daemon
  • Linux Firewall Logging
  • Log Reports
  • Labs

Auditing and Detection

  • Auditing Basics
  • Understanding an Attack Progression
  • Detecting an Attack
  • Intrusion Detection Systems
  • Labs


Application Security

  • Bugs and Tools
  • Tracking and Documenting Changes
  • Resource Access Control
  • Mitigation Techniques
  • Policy Based Access Control Frameworks
  • Real World Example
  • Labs

Kernel Vulnerabilities

  • Kernel and User Spaces
  • Bugs
  • Mitigating Kernel Vulnerabilities
  • Vulnerabilities Examples
  • Labs


  • Encryption and Authentication
  • Passwords and PAM
  • Hardware Tokens
  • Biometric Authentication
  • Network and Centralized Authentication
  • Labs

Local System Security

  • Standard UNIX Permissions
  • Administrator Account
  • Advanced UNIX Permissions
  • Filesystem Integrity
  • Filesystem Quotas
  • Labs

Network Security

  • TCP/IP Protocols Review
  • Remote Trust Vectors
  • Remote Exploits
  • Labs

Network Services Security

  • Network Tools
  • Databases
  • Web Server
  • File Servers
  • Labs

Denial of Service

  • Network Basics
  • DoS Methods
  • Mitigation Techniques
  • Labs

Remote Access

  • Unencrypted Protocols
  • Accessing Windows Systems
  • SSH
  • Labs

Firewalling and Packet Filtering

  • Firewalling Basics
  • iptables
  • Netfilter Implementation
  • Netfilter rule management
  • Mitigate Brute Force Login Attempts
  • Labs

Response and Mitigation

  • Preparation
  • During an Incident
  • Handling Incident Aftermath
  • Labs

Compliance testing with OSCAP

  • Compliance Testing
  • SCAP Introduction
  • OpenSCAP
  • SCAP Workbench
  • Command Line Scan
  • Labs
  • Prerequisites