SQL Injection: The Silent Threat that Risks Your Company Data

SQL injection remains one of the most critical vulnerabilities in the application security landscape. According to the recent OWASP Top 10 2021, injections (including SQL injections) maintain a worrying position, ranking third among the most dangerous vulnerabilities.

The Risk in Numbers

• 46% of web applications are vulnerable to some form of injection (Source: Acunetix Web Application Vulnerability Report)
• The average cost of a data breach in 2023: $4.35 million (IBM Cost of a Data Breach Report 2023)
• Average identification time: 277 days
• 80% of SQL injection attacks occur through unsanitized input forms

What is a SQL Injection?

A SQL injection is an attack that exploits vulnerabilities in the code to inject malicious SQL commands within legitimate queries. Imagine having this simple login code:

SELECT * FROM users WHERE username = '[INPUT]' AND password = '[INPUT]'

An attacker could enter: admin’ — as username, transforming the query into:

SELECT * FROM users WHERE username = 'admin' --' AND password = '[INPUT]'

The result? The attacker accesses as admin bypassing password verification.

Impact on Business

The consequences can be devastating:

• unauthorised access to sensitive data
• Violation of the GDPR (sanctions up to 4% of total turnover)
• Database integrity impairment
• Significant reputational damage

How to Recognize Vulnerability

1. Invalid input in: Search form Parameters URL Headers HTTP Cookie XML file
2. Database errors exposed to user
3. Abnormal application behaviors with special inputs

Best Practices for Protection

1) Prepared Statements

PreparedStatement stmt = conn.prepareStatement("SELECT * From users WHERE username = ? AND Password = ?");stmt.setString(1, username);stmt.setString(2, password);

2) Input Validation

• Permitted font whitelist
• Length validation
• Sanitization of inputs

3) Least Privilege Principle

• Use DB users with minimal privileges
• Separate accounts by read/write

4) WAF (Web Application Firewall)

• Implement SQL injection specific rules
• Continuous traffic monitoring

Prevention tools

1. OWASP ModSecurity Core Rule Set
2. SQLMap for security testing
3. SonarQube for static code analysis

Resources and Useful Links

Technical Guides

• OWASP SQL Injection Prevention Cheat Sheet
• PortSwigger SQL Injection Tutorial
• NIST Database Security Guidelines

Framework and Secure Libraries

• Hibernate ORM – ORM framework with integrated protection
• Entity Framework Core – Microsoft ORM with security functionality
• PHP PDO – PHP library for secure database access

Testing Tool

• OWASP ZAP – Open source vulnerability scanner
• Burp Suite – Professional security testing suite
• SQLMap Tutorial

Courses and Certifications

• OWASP Application Security Verification Standard
• Offensive Security Web Expert (OSWE)
• EC-Council Certified Security Analyst

Call to Action

Safety is a continuous process, not a product. I invite you to:

1. Make a security assessment of your applications
2. Implement the best practices discussed
3. Training the development team on modern secure coding techniques

---

It might also interest you

• Cross-Site Scripting (XSS): A Persistent Threat to Web Security
• Remote Code Execution (RCE): Corporate Security Threat
• Important updates and release: Wendy! !