Injection - Prevention

Core Prevention Principles

1. Use Parameterized Queries: Never concatenate user input
2. Input Validation: Whitelist acceptable patterns
3. Least Privilege: Limit database permissions
4. Escape Output: Context-appropriate encoding

Secure Coding Patterns

``python

SECURE: Parameterized query

cursor.execute("SELECT * FROM users WHERE name = ?", (username,))

``

Security Checklist

• [ ] Using parameterized queries
• [ ] Input validation implemented
• [ ] Database user has minimal permissions
• [ ] Regular security testing

What's Next?

• Overview: Understand what injection is
• Attack Vectors: Learn how attacks happen
• Examples: See vulnerable vs secure code
• Lab: Practice fixing vulnerabilities

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Part of the OWASP Top 10 Educational Repository