Module 4: SQL Injection Mastery

Union-Based & Error-Based SQLi

Union-Based & Error-Based SQLi

32:00

11:24 / 32:00

Union-Based & Error-Based SQLi

+30 XP

In this lesson you'll learn the core mechanics of Union-based and Error-based SQL injection attacks. We'll cover how to determine column counts using ORDER BY, craft UNION SELECT payloads to extract database metadata, and leverage database-specific functions to trigger verbose error messages that leak data.

Lesson Resources

SQL Injection Cheat Sheet (PortSwigger)PDF
OWASP SQL Injection Testing GuideLink
Lab Target CredentialsTXT
01.

Union-based injection requires knowing the number of columns in the original query.

02.

Use ORDER BY to determine column count before crafting UNION payload.

03.

Error-based: leverage database error messages to extract data (EXTRACTVALUE, UPDATEXML).

04.

Always test with a single quote first — observe the error response carefully.