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Suppose our application provides a URL (e.g., as part of a search this site functionality), http://www.mywwwservice.com/query question=cookies, which returns HTML documents containing the following fragment: ... <p>Your query for 'cookies' returned the following results:</p> ... That is, the value of the query parameter question is inserted into the page returned by mywwwservice.com. We assume further that the data is not validated, filtered, or escaped. Now suppose that an attacker manages to cause our user Alice to load the following URL into her browser for example, by tricking her into clicking a link, or by luring her into viewing a harmless-looking page that sources this URL in an invisible <iframe>: http://www.mywwwservice.com/query question=cookies+%3Cscript%3Emalicious-script%3C/script%3E The document loaded into the browser in response to this request will contain the following HTML fragment: <p>Your query for 'cookies <script>malicious-script</script>' returned the following results:</p> The string included into the HTML fragment is the URL-decoded version of the question query parameter, whose value was chosen by the attacker. However, this string represents an HTML <script> tag, the contents of which are executed as JavaScript in the context of the page the <script> tag appeared in. We thus have a situation in which script chosen by an attacker (which we have denoted with the placeholder malicious-script in the example) executes in the context of a page loaded from a URL in our domain. Since this situation involves script controlled by one entity (often a malicious web site) to be evaluated in the context of a page loaded from another site, it is commonly referred to as cross-site scripting (XSS).7

The file path is /download/details.aspx, which is a reasonable attempt to be descriptive with the source code name, but it s a generic page that fetches the actual download details from a database. The filename can t possibly contain the important information that the URL should contain. Even worse, an unreadable GUID is used to identify the actual download, and at this point the URL has lost all meaning. This is a perfect opportunity to create a beautiful URL. Decouple the source code filename from the URL, and it can become a resource locator again with the resource being a download package for Internet Explorer. The user never needs to know that this resource is served by a page called details.aspx. The result would look like this:

There are three methods provided for changing the current page. If you know the specific index of the page you want to view, you can use gtk_notebook_set_current_page() to move to that page. void gtk_notebook_set_current_page (GtkNotebook *notebook, gint page_number); At times, you may also want switch to the next or previous tab, which can be done with call gtk_notebook_next_page() or gtk_notebook_prev_page(). If a call to either of these functions would cause the current tab to drop below zero or go above the current number of tabs, nothing will occur; the call will be ignored. When deciding what page to move to, it is often useful to know the current page and the total number of tabs. These values can be obtained with gtk_notebook_get_current_page() and gtk_notebook_get_n_pages() respectively.

This is clearly an improvement, but we re assuming that the description of the item is unique. Ideally, in the design of an application, we could make some human-readable information like the title or description unique to support the URL schema. If this weren t possible, we could implement another technique to end up with something like the following URL:

In the this section, we explore in more detail what malicious actions the attacker s script could carry out, and what script fragments the attacker would supply for the placeholder malicious-script to achieve his goals. Stealing Cookies If our application (hosted in the www.mywwwservice.com domain) uses cookie-based session authentication, those cookies essentially embody Alice s (our user s) session with our application. If an attacker is able to obtain the cookies that Alice s browser holds for the domain www.mywwwservice.com, and Alice has a logged-in session with our application at this point,

Various widgets including GtkLabel do not respond to GDK events, because they do not have an associated GDK window. To fix this, GTK+ provides a container widget called GtkEventBox. Event boxes catch events for the child widget by providing a GDK window for the object. Listing 3-9 connects the button-press-event signal to a GtkLabel by using an event box. The text in the label is changed based on its current state when the label is double-clicked. Nothing visible happens when a single click occurs, although the signal is still emitted in that case. Listing 3-9. Adding Events to a GtkLabel (eventboxes.c) #include <gtk/gtk.h> static gboolean button_pressed (GtkWidget*, GdkEventButton*, GtkLabel*); int main (int argc, char *argv[]) { GtkWidget *window, *eventbox, *label; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Event Box"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 200, 50);

http://microsoft.com/downloads/windows-internet-explorer-7-for-windows-xpsp2/1987429874