Lesson Plan Title: How to Perform Stored Cross Site Scripting (XSS)

Concept / Topic To Teach:

It is always a good practice to scrub all inputs, especially those inputs that will later be used as parameters to OS commands, scripts, and database queries. It is particularly important for content that will be permanently stored somewhere. Users should not be able to create message content that could cause another user to load an undesirable page or undesirable content when the user's message is retrieved.

General Goal(s):

The user should be able to add message content that cause another user to load an undesirable page or content.

Figure 1 Lesson 14

Solution:

Enter this: <script language="javascript" type="text/javascript">alert("Ha Ha Ha");</script> in the message text box.

Figure 2 Stored message

Figure 3 Lesson 14 nearly completed

Now enter this: <script language="javascript" type="text/javascript">alert(document.cookie);</script> in the message text box. You will get your SessionId in a popup.

Solution by Erwin Geirnaert |