Overview
In ASP.NET Core, improper handling of user-controlled input on inventory-related pages can lead to reflected or stored XSS if data is concatenated into HTML or rendered with Html.Raw. While Razor views auto-encode output by default, deliberately turning off encoding or using unsafe rendering patterns can reintroduce risk. The CVE-2005-4398 example demonstrates the danger of reflecting unsanitized input back to users, which is a pattern that must be avoided in any ASP.NET Core inventory UI. Additionally, inventory-specific remediation includes ensuring concurrency controls and transactional integrity to prevent inventory manipulation during reflective UI flaws from becoming vectors for broader exploitation.
Affected Versions
CVE-2005-4398: lemoon 2.0 and earlier
Code Fix Example
ASP.NET Core API Security Remediation
Vulnerable pattern (unsafe rendering of user input):
using Microsoft.AspNetCore.Mvc;
public class InventoryController : Controller
{
[HttpGet]
public IActionResult Search(string q)
{
// Vulnerable: direct string concatenation of user input into HTML
var html = "<html><body>Inventory search results for: " + q + "</body></html>";
return Content(html, "text/html");
}
}
Fixed pattern (safe rendering with encoding and proper view model):
using Microsoft.AspNetCore.Mvc;
public class InventoryController : Controller
{
[HttpGet]
public IActionResult Search(string q)
{
var model = new InventorySearchViewModel { Query = q };
return View(model);
}
}
// View model
public class InventorySearchViewModel
{
public string Query { get; set; }
}
// Razor View: Views/Inventory/Search.cshtml
@model InventorySearchViewModel
<html>
<body>
<h2>Inventory search results</h2>
<p>Query: @Html.Encode(Model.Query)</p>
</body>
</html>