Security Auditing

Learning Objectives Define security auditing and explain its importance in a cybersecurity lifecycle. Identify at least three common types of security vulnerabilities in code and system configurations. Analyze a simple log file to detect patterns of suspicious activity, such as a brute-force attack. Apply the Principle of Least Privilege to evaluate user access permissions. Conduct a basic security audit on a given code snippet to find potential flaws. Differentiate between an audit finding and a remediation step. If a digital thief broke into your school's network, how would you prove who did it and how they got in? 🕵️‍♂️ That's the job of a security auditor! This lesson introduces you to the world of security auditing, the process of systematically examining a s...

TermDefinitionExample Security AuditA systematic evaluation of the security of a company's information system by measuring how well it conforms to a set of established criteria.A school hires an external company to review its network, firewalls, and student database access rules to find any weaknesses before a hacker does. Log FileA file that records events that occur in an operating system or other software. It's a digital footprint of all activity.A web server log might contain entries like: `192.168.1.10 - - [10/Oct/2023:13:55:36] "GET /login.php" 200` which shows an IP address accessing the login page at a specific time. VulnerabilityA weakness in a system, application, or process that could be exploited by an attacker.A website's login form that doesn't...

The Principle of Least Privilege (PoLP) A user should only have the absolute minimum permissions required to perform their job function. When auditing user accounts, always check if their permissions exceed their needs. An English teacher, for example, should not have administrative access to the math department's grade server. This minimizes potential damage if an account is compromised. Log Analysis Pattern: Aggregate & Filter Group similar log entries and then filter for anomalies. Instead of reading millions of log lines one by one, auditors use tools to group them. For example, to find a brute-force attack, you would group all login attempts by username and IP address, then filter for accounts with hundreds of 'FAILED' attempts from a single IP in a s...