A comprehensive guide to securing your ASP.NET application. Covering 15 vulnerability categories with framework-specific code examples and best practices.
Razor syntax auto-encodes output by default. Never use `@Html.Raw()` with unsanitized user content.
Use Entity Framework with LINQ queries or parameterized SQL. Never use string interpolation in `FromSqlRaw()` calls.
ASP.NET includes anti-forgery token validation. Use `[ValidateAntiForgeryToken]` on all POST actions and include `@Html.AntiForgeryToken()` in forms.
Use Data Annotations (`[Required]`, `[StringLength]`, `[RegularExpression]`) and `ModelState.IsValid` for input validation.
Use ASP.NET Identity for authentication with proper password hashing (PBKDF2 by default). Never implement custom password storage.
Configure HTTPS redirection and HSTS in `Program.cs`. Use `app.UseHttpsRedirection()` and `app.UseHsts()` in production.
Use `[Authorize]` attributes and policy-based authorization for route-level and action-level access control.
Implement rate limiting using ASP.NET Core's built-in `RateLimiter` middleware (available from .NET 7+).
SQL Injection
A03:2021 - Injection · CWE-89
Broken Authentication
A07:2021 - Identification and Authentication Failures · CWE-287
Command Injection
A03:2021 - Injection · CWE-78
Insecure Deserialization
A08:2021 - Software and Data Integrity Failures · CWE-502
Row Level Security (RLS) Bypass
A01:2021 - Broken Access Control · CWE-863
Cross-Site Scripting (XSS)
A03:2021 - Injection · CWE-79
Cross-Site Request Forgery (CSRF)
A01:2021 - Broken Access Control · CWE-352
Insecure Direct Object References (IDOR)
A01:2021 - Broken Access Control · CWE-639
Sensitive Data Exposure
A02:2021 - Cryptographic Failures · CWE-200
JWT Vulnerabilities
A07:2021 - Identification and Authentication Failures · CWE-347
Path Traversal
A01:2021 - Broken Access Control · CWE-22
Server-Side Request Forgery (SSRF)
A10:2021 - Server-Side Request Forgery · CWE-918
File Upload Vulnerabilities
A04:2021 - Insecure Design · CWE-434
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