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for approval The manager could see all of her employees hours, comments, and salaries So far, the application works as intended Now imagine that in my comments for this week, I include JavaScript that sends all the data displayed on a page to a web server that I control When my manager views my timecard and my comments, she is unknowingly executing my JavaScript stored in the comments field, which sends the salary of everyone in my group to a server that I control If I knew that the business rules of the system were such that overtime of more than 20 hours goes up to our group vice president for approval, I could wait for a week when I had more than 20 hours of overtime to inject my code, thus gaining access to the salaries of everyone in the whole organization Who would have thought that a simple comments field could do so much damage Hopefully, you re now asking yourself, What can I do to prevent this Fortunately, APEX includes features to help developers mitigate the risk of XSS To summarize, the behavior we are trying to prevent is the ability for one user to submit JavaScript that will be displayed and therefore executed by other users The most common APEX objects that display data are regions of type Report and APEX page items When a new Standard Report is created based on a SQL query in APEX 32, the default column type for every column is called Standard Column Unfortunately, this type of column is vulnerable to XSS To prevent XSS, a developer must change this column type to Display as Text (escape special characters, does not save state) Future versions of APEX will likely change the default column type to the more secure version The new type of APEX reports, called Interactive Reports, use the secure column type by default This same concept applies to APEX page items If a developer chooses an item of type Display As Text, any JavaScript code that is stored in session state for that item will be executed when the page is displayed To prevent this, a developer should choose items of type Display As Text (escape special characters, does not save state), as shown in Figure 12-6 In the case of the Report Column type and the APEX page item type, the escape special characters aspect is key, because it will send the HTML character codes for the less-than and greater-than signs < and >, respectively to the browser, not the characters < and > The escaping of such markup-sensitive characters will cause the browser to render the actual characters, rather than interpret them as HTML Using this technique will prevent data containing <script> </script> from being interpreted as executable JavaScript One of the best ways for a developer to understand a security vulnerability is to intentionally create an example that is vulnerable, and then re-create the same example in a secure way To that end, the following is a simple two-page APEX application that demonstrates the insecure and secure report column types and page item types The following code, saved in a database table, simply writes a line of text onto a web page The message is written in Unicode character codes so that it is unreadable unless the JavaScript function is executed:.

The McGraw Hill Companies, 2010

<script type="text/JavaScript"> documentwrite(StringfromCharCode(88,83,83,32,86,117,108,110,101,114,97,98,108,101)); </script>

Create the electrical schematic drawing Create blocks of each of the components and then insert them as needed

3648 40 2x 80 x 3648 3200 120x 2x2 2x2 120x 448 0 1 1 2 2x 120x 448 0 2 2 x2 60x 224 0

FIGURE 12-6

The McGraw Hill Companies, 2010

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The report on the page has two comments columns that display the previous JavaScript function The first column, Comments - Secure, is set to the secure type of Display as Text (escape special characters, does not save state) The second column, Comments - Insecure, is set to the type Standard Column As you can see in Figure 12-7, the first column shows the JavaScript function in its entirety, but does not execute it, while the second column is actually executing the JavaScript as you can read the phrase XSS Vulnerable in the comments The developer of this application anticipated that users would enter only comments about an employee However, it was trivial to add a bit of JavaScript that is now executed by any other user who views the report

The McGraw Hill Companies, 2010

60 60 q 60 2 4 1 224 2 1 p 2704 60 52 4; 56 2 2 60 p 3600 896 2

Create a single view of the spacer Dimension the drawing and add a note indicating the thickness of the spacer

In its simplest form, four categories of user profiles exist: Read-only users Read-write users Application administrators/developers Database administrators

The McGraw Hill Companies, 2010

1:

x

The McGraw Hill Companies, 2010

FIGURE 1-2

Create and fully dimension the views of the rod support Determine the drawing area on your own, based on space requirements

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