Table of Contents
| Section | Description |
|---|---|
| OWASP Top 10 | Critical threats in web security |
| SQL Injection | Data protection in .NET |
| XSS | Frontend safety & sanitization |
| CSRF | Identity protection strategies |
| Race Conditions | Thread safety in backend systems |
| ASP.NET Core Security Layers | Built-in protection mechanisms |
| Penetration Testing Tools | Common tools for testing .NET apps |
| SEI CERT & OWASP Guidelines | Standards for secure software |
| Official Training | Courses to master secure .NET development |
OWASP Top 10: Know the Threats Before You Code
The OWASP Top 10 is a globally recognized list of the most common and severe vulnerabilities affecting web applications — including .NET systems.
Current OWASP Top 10 Threats:
Broken Access Control
Cryptographic Failures
Injection (SQL, NoSQL, LDAP)
Insecure Design
Security Misconfiguration
Vulnerable Components
Identification & Authentication Failures
Integrity Failures
Logging & Monitoring Issues
Server-Side Request Forgery (SSRF)
For in-depth defensive strategies:
🔗 Securing .NET Web Applications Training
SQL Injection: Still a Real Threat in .NET
csharp
// ❌ Vulnerable Example
var user = context.Users
.FromSqlRaw("SELECT * FROM Users WHERE Email = '" + email + "'")
.FirstOrDefault();
✔ Safe Solution:
csharp
var user = context.Users
.FirstOrDefault(u => u.Email == email);
Tips to Prevent SQL Injection in .NET:
Use LINQ with Entity Framework
Avoid raw queries with dynamic input
Use parameterized methods like
SqlParameter
XSS: Cross-Site Scripting Vulnerabilities
Unsanitized user input rendered in your UI can lead to XSS attacks.
html
@Html.Raw(ViewBag.Message)
✔ Secure Practice:
Razor's default output encoding protects most scenarios
Avoid unnecessary use of
@Html.Raw()Implement CSP (Content-Security-Policy) headers
CSRF: Protecting User Sessions
Cross-Site Request Forgery exploits a logged-in user's credentials to perform unwanted actions.
In ASP.NET Core:
csharp
[ValidateAntiForgeryToken]
public IActionResult SubmitForm(UserModel model)
{
...
}
CSRF token generation in Razor views:
html
@Html.AntiForgeryToken()
Learn more about web service security:
🔗 Introduction to .NET Core for Web Services Training
Race Conditions: Invisible Yet Dangerous
Race conditions occur when two or more threads access shared data simultaneously, leading to unexpected behavior.
Typical Cases:
Duplicate payments
Reused coupon codes
Unsynchronized transaction logs
✔ Best Practices:
Use
lockblocks for critical sectionsApply
SemaphoreSlimorMutexfor async coordinationHandle concurrency in database transactions
ASP.NET Core Security Architecture
| Layer | Role |
|---|---|
| Authentication Middleware | Verifies user identity |
| Authorization Middleware | Role-based access control |
| HTTPS Enforcement | Redirects all HTTP to HTTPS |
| Identity Framework | Handles user login/roles/passwords |
| Data Protection APIs | Protects sensitive keys & tokens |
csharp
app.UseHttpsRedirection();
app.UseAuthentication();
app.UseAuthorization();
Build robust web applications:
🔗 Developing ASP.NET MVC Web Applications Training
Penetration Testing Tools for .NET Apps
| Tool | Purpose |
|---|---|
| OWASP ZAP | Free security scanner for web apps |
| Burp Suite | Professional testing proxy |
| Nikto | Web server scanner |
| Nmap | Network discovery and port scanning |
| .NET Security Analyzer | Static code analysis for .NET security flaws |
Use these in development, staging, and post-deployment environments.
SEI CERT & OWASP Secure Coding Principles
SEI CERT Guidelines promote safe, predictable software practices:
Use
usingblocks andIDisposablefor resource cleanupAvoid unchecked exceptions
Use strong typing and avoid
dynamicSanitize input and validate boundaries
OWASP Recommendations:
Never trust client input
Encrypt sensitive data
Log safely without exposing user data
Apply server-side authorization, not just client-side checks
Official .NET Security Training
Become an expert by joining these internationally recognized courses:
| Course | Link |
|---|---|
| Securing .NET Web Applications | View Course |
| Introduction to .NET Core for Web Services | View Course |
| Developing ASP.NET MVC Web Applications | View Course |