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XSS attacks can be particularly damaging in situations in which a stored XSS attack propagates from user account to user account in a worm-like pattern (we discussed worms that exploit vulnerabilities in serverside applications to propagate from server to server in 5). For example, in 2005, an XSS worm was released on the MySpace social networking site. The worm exploited an XSS vulnerability in the MySpace application that allowed stored XSS to propagate from user profile page to user profile page along the friend relationships within the MySpace social network. The actual payload of this worm was fairly harmless; it simply added a particular user, Samy, to the list of the infected user s friends. Nevertheless, MySpace had to be shut down for several hours to clean up the infected profiles and prevent additional XSS. Needless to say, the impact of an XSS worm could be much worse.

When designing a URL schema, it s worth considering how a URL could be manipulated or hacked by the end user in order to change the data displayed. For example, it might reasonably be assumed that removing the parameter 04 from the following URL might present all events occurring in 2008:

One important characteristic of containers is that each container can hold other containers. To really drive this point home, in this example, you will use a large number of containers. The main window will show a GtkNotebook and two buttons along the bottom. The notebook should have four pages. Each notebook page should hold a GtkButton that moves to the next page (The GtkButton on the last page should wrap around to the first page.) Create two buttons along the bottom of the window. The first should move to the previous page in the GtkNotebook, wrapping to the last page if necessary. The second button should close the window and exit the application when clicked.

http://example.com/events/2008/04

However, we note that stored and reflected XSS are not fundamentally different; in both cases, the underlying issue is that untrusted data can be delivered to a user s browser such that script chosen by the attacker is executed in the user s browser in the context of the vulnerable application.

Exercise 3-1 is a simple application to implement, but it illustrates a few important points. First, it shows the usefulness of GtkVBox and GtkHBox, and how they can be used together to create complex user interfaces. It is true that this same application could be implemented with a GtkTable as the direct child of the window, but it is significantly easier to align the buttons along the bottom with a horizontal box. You will notice that the buttons were packed at the end of the box, which aligns them to the right side of the box, and this is easier to implement with boxes. Also, you saw that containers can, and should, be used to hold other containers. For example, in Exercise 3-1, a GtkWindow holds a GtkVBox, which holds a GtkHBox and a GtkNotebook. This structure can become even more complex as your application grows in size. Once you have completed Exercise 3-1, move on to Exercise 3-2. In the next problem, you will use the paned container instead of a vertical box.

Table 16.1 Partial URL schema for an events-management application URL http://example.com/events http://example.com/events/<year> http://example.com/events/<year>/<month> http://example.com/events/<year>/<month>/<date> Description Displays all events Displays all events in a specific year Displays all events in a specific month Displays all events on a specific day

In this exercise, you will expand upon the code you wrote in Exercise 3-1. Instead of using a GtkVBox to hold the notebook and horizontal box of buttons, create a GtkVPaned widget. In addition to this change, you should hide the GtkNotebook tabs, so the user is not able to switch between pages without pressing buttons. In this case, you will not be able to know when a page is being changed. Therefore, each button that is in a GtkNotebook page should be contained by its own expander. The expander labels will allow you to differentiate between notebook pages.