Secure Web Development: How to shield your application from the first line of code

Today, web applications are the main gateway for most digital businesses. However, they also represent the attack vector most exploited by cybercriminals. The traditional paradigm of developing software quickly and 'patching' security after deployment has proven to be inefficient and costly.

Secure Web Development (also known as DevSecOps or Secured Development) is the methodology necessary to build robust applications from the ground up.

The OWASP Top 10 Standard as a Defensive Guide

The OWASP (Open Web Application Security Project) consortium periodically publishes a list of the ten most critical web vulnerabilities. To develop secure software, it is imperative to design defenses against these vectors:

1. Injections (A03:2021-Injection): Occur when untrusted data is sent to an interpreter as part of a command or query (e.g. SQL Injection).
   • Defense: Always use parameterized queries (Prepared Statements) and secure ORMs that separate data from executable code.
2. Authentication Loss (A07:2021-Identification and Authentication Failures): Flaws in session and password management that allow attackers to impersonate user identities.
   • Defense: Implement multi-factor authentication (MFA), use strong hashing algorithms (such as bcrypt or Argon2) to store passwords, and configure session tokens with strict expiration.
3. Sensitive Data Exposure (A02:2021-Cryptographic Failures): Store or transmit confidential information (cards, passwords, medical data) without proper encryption.
   • Defense: Force the use of TLS (HTTPS) with modern configurations, and encrypt data at rest using robust symmetric algorithms such as AES-256-GCM.

Secure Architecture in the Frontend and Backend

A common mistake is to perform security validations only in the user interface (Frontend). Since client code can be modified by any user in their browser, the Backend must act as the ultimate validation barrier.

• Input Sanitation: Filter and clean all the information received by the backend APIs before processing it in the database.
• HTTP Security Headers: Configure response headers such as Content-Security-Policy (CSP) to prevent Cross-Site Scripting (XSS) attacks and Strict-Transport-Security (HSTS) to force TLS connections.

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