SQL Injection (SQLi) — What it is, How it works & How to DEFEND (2025)
In this video of Cyber Security Tutorial, I explain SQL Injection from scratch — what SQL is, why web apps use it, how attackers inject malicious queries, real payload examples, the impact of successful SQLi, detection techniques, and practical defenses every developer must apply.

What you’ll learn (clear & practical):
What is SQL & how web apps use it (Browser → Server → Database → Browser)
What is SQL Injection — attacker changes query logic to steal/modify data
Why SQLi happens — unsanitized input, dynamic queries, excess DB privileges, verbose errors
Types of SQLi with simple analogies:
* In-band (Error & UNION) — attacker sees results in same channel
* Blind (Boolean & Time) — infer data via responses or delays
* Out-of-band (OOB) — force DB to call external server
Example payload concepts (educational only): login bypass ' OR '1'='1' --, UNION extract, boolean/time blind techniques
Real impact: data theft, auth bypass, data modification, full system compromise
How to detect SQLi: code review, fuzzing, logs, behavioral monitoring, scanners (authorized labs only)
Strong defenses: Prepared Statements, input whitelisting, least privilege, hide errors, use ORM safely, WAF, monitoring & patching

IMPORTANT — Educational Use Only:
This video is for educational and defensive purposes only. Do NOT use SQLi techniques on sites you do not own or lack written permission to test. Misuse is illegal and unethical. Follow responsible disclosure if you find vulnerabilities.

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