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In many programming languages, variables with an integer data type can store numbers within a certain range. For example, a signed two-byte integer can store values between 32768 and 32767. An integer overflow vulnerability is one in which out-of-range values specified for an integer wrap around, resulting in situations a programmer does not expect or check for which gives an attacker the opportunity to alter the normal course of execution of a program. For instance, if you try to assign a value of 32768 to a two-byte signed integer, the integer will take on the value 32768. To show how integer overflows can cause security vulnerabilities, consider the following formatStr() function: 1 /* Writes str to buffer with offset characters of blank spaces 2 preceding str. */ 3 void formatStr(char *buffer, int buflen, 4 int offset, char *str, int slen) { 5 char message[slen+offset]; 6 int i; 7 8 /* Write blank spaces */ 9 for (i = 0; i < offset; i++) 10 message[i] = ' '; 11 12 strncpy(message+offset, str, slen); 13 strncpy(buffer, message, buflen); 14 message[buflen-1] = 0; /* Null terminate */ 15 }

One vulnerability in our example application is that it rendered the submitted script as script to be executed by the browser (as shown in figure 11.2). Instead, we should have HTML-encoded the comment. HTML encoding transforms text from HTML that s interpreted by the browser into symbols that the browser will render without interpretation. Instead of our script being parsed and executed, it would ve simply been displayed as text. In our view, we rendered the comment with this markup: <%= Model.Comment %>, but we could ve applied a built-in function that encodes HTML: <%= Html.Encode(Model.Comment) %>. Figure 11.4 shows how a harmless HTML-encoded script would appear.

The URI of the web site that the link button visits. This must be a full URI such as http://www.gtkbook.com.

Cross-site scripting (XSS)

If set to TRUE, the menu will be able to be torn from its attached widget. The title that will be displayed when the menu is torn from its attached widget.

The goal of the function is to copy the characters in str to buffer, with offset blank spaces before the contents of str The implementation seems reasonable enough, although perhaps not the most efficient The message variable is allocated with enough space to store str and the number of offset characters requested The blank spaces are written into message first, via the for loop in lines 9 and 10 Then, str is copied into message immediately after the blank spaces in line 12 The strncpy() function is used as good practice to make sure that no more than slen characters are written but its use is moot, as message is allocated to have enough space.

There s a new feature in ASP.NET 4 that allows developers to conveniently express HTML-encoded output without using the Html.Encode helper function. Instead of specifying output with <%= "text" %>, we can use <%: "text" %>. For more information, refer to Phil Haack s blog post, HTML Encoding Code Blocks with ASP.NET 4 (http://mng.bz/Z3V5). Although HTML encoding all output makes our application much more secure, hackers are crafty and are constantly discovering new ways to evade encoding. It s important to also check input to our application.

The direction that menu items of children will be packed The direction that child menu items will be packed

To craft the vulnerable example, we had to disable protective features in ASP.NET MVC 2. Listing 11.8 demonstrates how input validation was specifically disabled.

In line 13, strncpy() is used again to copy the local variable message into the buffer supplied by the caller, and this time, use of strncpy() is essential, as there is no guarantee that it has enough space to hold message In addition, to cover the case in which buffer is not long enough, line 14 explicitly null terminates message, since strncpy() does not guarantee that it will do so While the implementation of formatStr() seems correct, it does have an integer overflow vulnerability If an attacker can influence the value of offset, he can take control of the program If he can pass a value of offset that is larger than what an int can hold, it will wrap around.

The button or buttons shown in the action area of the message dialog. The widget image to display in the GtkMessageDialog. The type of message that is reported by the GtkMessageDialog. The message type defines what image is displayed in the dialog unless image is set. Secondary text that is displayed below the string defined in text. If set to TRUE, markup in secondarytext will be parsed. The main text displayed by the dialog, which will appear above any secondary text. If set to TRUE, markup in text will be parsed.

[ValidateInput(false)] public ViewResult Save(CommentInput form) { return View(form); }

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