JAVA.IO.INJ.XSS.EMWP : Cross Site Scripting In Error Message Web Page (Java)

Summary

Tainted data flows into a field annotated as @CrossSiteTrusted and @SendWebError, or into a script execution routine that send an web page error.

Checks for this class use the CodeSonar Java taint analysis. See Taint Tracking for CodeSonar Java Warning Classes for more information on this analysis, including lists of the methods that CodeSonar automatically recognizes as relevant and information about specifying additional methods that CodeSonar should recognize as taint sources, sinks, or sanitizers.

Use configuration parameter JAVA_ANALYSIS_ADVANCED_INJECTION to specify the level of checking to perform for this and other taint-related warning classes:

• For basic checking, set JAVA_ANALYSIS_ADVANCED_INJECTION=No in your project configuration file.
• For advanced checking, set JAVA_ANALYSIS_ADVANCED_INJECTION=Yes.

Properties

WARNING_FILTER += discard class="Cross Site Scripting In Error Message Web Page (Java)"

Example

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class InjectionTest extends HttpServlet {

  @Override
  protected final void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
    processRequest(request, response);
  }

  private void processRequest(HttpServletRequest request, HttpServletResponse response) throws IOException {

    String data = request.getParameter("data");              // The value of variable 'data' is obtained from user input

    if (data != null) {
        // ...
        response.sendError(404, data); // Cross Site Scripting In Error Message Web Page (Java) warning issued here
    }
    // ... 
  }
}

Resolution

Verify that a security error actually corresponds to unconstrained information flow from source locations into sink locations. If this is the case, add a sanitizing algorithm to clean data before it flows into sinks, or use safe statements to propagate data inside the program.

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

• JAVA_ANALYSIS_ADVANCED_INJECTION
• REPORT_SIMILAR_WARNINGS
• WARNING_FILTER