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Adding insecure XML code #473

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Adding insecure XML code #473

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14 changes: 13 additions & 1 deletion src/public-webapp/Controllers/HomeController.cs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
using System.Diagnostics;
using System.Net;

using System.Xml;
using Microsoft.AspNetCore.Mvc;

using MX.GeoLocation.GeoLocationApi.Client;
Expand Down Expand Up @@ -71,6 +71,18 @@
[HttpGet]
public async Task<IActionResult> LookupAddress(string id)
{
// Create a new XML payload to end to our 'new' backend service.
using (XmlWriter writer = XmlWriter.Create("query.xml"))
{
writer.WriteStartDocument();

// BAD: Insert user input directly into XML
writer.WriteRaw("<query><address>" + id + "</address></query>");

Check failure

Code scanning / CodeQL

XML injection High

This XML element depends on a
user-provided value
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.

Copilot Autofix AI 3 months ago

To fix the XML injection vulnerability, we should avoid using the WriteRaw method with user input. Instead, we can use the high-level XML API methods that automatically escape user content. Specifically, we should replace the WriteRaw method with WriteStartElement and WriteElementString methods to ensure the content is appropriately escaped.

Suggested changeset 1
src/public-webapp/Controllers/HomeController.cs

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/src/public-webapp/Controllers/HomeController.cs b/src/public-webapp/Controllers/HomeController.cs
--- a/src/public-webapp/Controllers/HomeController.cs
+++ b/src/public-webapp/Controllers/HomeController.cs
@@ -78,6 +78,7 @@
 
-                // BAD: Insert user input directly into XML
-                writer.WriteRaw("<query><address>" + id + "</address></query>");
-
+                // GOOD: Use standard API, which automatically encodes values
+                writer.WriteStartElement("query");
+                writer.WriteElementString("address", id);
                 writer.WriteEndElement();
+
                 writer.WriteEndDocument();
EOF
@@ -78,6 +78,7 @@

// BAD: Insert user input directly into XML
writer.WriteRaw("<query><address>" + id + "</address></query>");

// GOOD: Use standard API, which automatically encodes values
writer.WriteStartElement("query");
writer.WriteElementString("address", id);
writer.WriteEndElement();

writer.WriteEndDocument();
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writer.WriteEndElement();
writer.WriteEndDocument();
}

if (!ModelState.IsValid)
return View(new LookupAddressViewModel());

Expand Down Expand Up @@ -246,7 +258,7 @@
const string xForwardedForHeaderKey = "X-Forwarded-For";

if (webHostEnvironment.IsDevelopment())
return IPAddress.Parse("8.8.8.8");

Check warning on line 261 in src/public-webapp/Controllers/HomeController.cs

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GitHub Actions / code-scanning 

Make sure using this hardcoded IP address '8.8.8.8' is safe here. (https://rules.sonarsource.com/csharp/RSPEC-1313)

IPAddress? address = null;

Expand All @@ -265,10 +277,10 @@
if (address == null)
address = httpContextAccessor.HttpContext?.Connection.RemoteIpAddress;

return address ?? IPAddress.Parse("8.8.8.8");

Check warning on line 280 in src/public-webapp/Controllers/HomeController.cs

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GitHub Actions / code-scanning 

Make sure using this hardcoded IP address '8.8.8.8' is safe here. (https://rules.sonarsource.com/csharp/RSPEC-1313)
}

private bool ValidateHostname(string address)

Check warning on line 283 in src/public-webapp/Controllers/HomeController.cs

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GitHub Actions / code-scanning 

Make 'ValidateHostname' a static method. (https://rules.sonarsource.com/csharp/RSPEC-2325)
{
if (IPAddress.TryParse(address, out var ipAddress))
{
Expand Down
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