Episode 48 — Recognize Web App Vulnerabilities: Injection, XSS, Access Control, and SSRF

This episode surveys high-impact web application vulnerabilities in the way the GSEC exam expects, emphasizing how to recognize the weakness from symptoms and choose the control that actually addresses the root cause. You’ll define injection as untrusted input being interpreted as commands, including SQL injection and command injection, then connect it to parameterized queries, input validation, and least privilege database accounts. You’ll define XSS as untrusted content executing in a user’s browser context, then connect it to output encoding, content security policy, and safe templating. We’ll cover broken access control as failures in authorization enforcement, including IDOR-style issues where users access data they should not, and we’ll explain SSRF as a server being tricked into making network requests to internal or sensitive endpoints. Scenarios include a vulnerable search field leaking database contents, a comment box injecting scripts into an admin’s session, an API that trusts client-supplied identifiers, and a file fetch feature that reaches internal metadata services. Best practices emphasize secure coding patterns, defense in depth through validation and encoding, and testing that validates authorization at the server, not the UI. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your educational path. Also, if you want to stay up to date with the latest news, visit DailyCyber.News for a newsletter you can use, and a daily podcast you can commute with.