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In an attempt to deal with buffer overflow attacks, some have suggested that program stacks should not be executable. For example, some microprocessors support a No Execute (NX) bit for certain regions of memory, and the bit can used by the Data Execution Protection (DEP) feature introduced in some versions of Microsoft Windows, for instance. While this approach can help deal with attacks in which new executable code is injected, other attacks would still be possible. For instance, the attacker can construct the return address to be the address of some other code that is already on the victim system, but send her choice of parameters to that code. The previous vault code is a perfect example of this, in which the attacker simply wants control to jump to an already existing function in the program to open the vault, without knowing the correct password. If the attacker wants to instead, say, access a command shell, she can write the address of the exec system call into the attack string, and include additional data in the attack string to specify /bin/sh or cmd.exe as the name of the command that should be executed. (This is often referred to as a returninto-libc exploit.) The part of the attack string that can be used to access command shells is often called shellcode, and, if used on a process that has root or administrator privileges, can give the attacker complete control of the machine.

A list of individuals who helped create the artwork used by the application. This often includes information such as an e-mail address or URL for each artist, which will be displayed as a link. A list of individuals who helped program the application. This often includes information such as an e-mail address or URL for each programmer, which will be displayed as a link.

Each is optimized for designing an MVC view, and many are ported versions of other established view engines for other established MVC frameworks For example, NHaml is a port of the popular (and extremely terse) Haml view engine (http://haml-langcom/) Although the built-in view engine works well for most ASPNET MVC applications, we ll explore one of the alternatives here Spark is a view engine designed for ASPNET MVC and MonoRail (wwwcastleprojectorg/monorail/) Spark provides a unique blend of C# code inline with HTML, disguised as XML elements and attributes There are disadvantages to some view engines, such as the lack of IntelliSense and a slightly less integrated feel in Visual Studio, but Spark provides integration with Visual Studio, including IntelliSense and a view compiler The view compiler ensures that we don t have to wait for runtime exceptions to expose typos and bugs in our views.

The root cause of the buffer overflow vulnerability is that the gets() function does not check the length of the user input that is provided. If the gets() function checked that it did not attempt to write more data into buf than was allocated to it, then the attacker could be prevented from overwriting the return address. In the preceding explanation of buffer overflows, we have made simplifications for clarity. For instance, depending upon the microprocessor and its architecture, there may exist additional data fields (such as an Extended Base Pointer, or EBP) that have to be overwritten before the return address can be overwritten. For more details, you are encouraged to study the seminal paper Smashing the Stack for Fun and Profit, by Aleph One. Greg Hoglund and Gary McGraw provide a chapter on buffer overflows in Exploiting Software: How to Break Code. There is also an entire book on buffer overflow attacks, entitled Buffer Overflow Attacks: Detect, Exploit, Prevent (James Foster et al.). Buffer overflows are a classic example of how disastrous attacks can occur when input data in this case, an attack string can be used to affect the control of a running program.

In this section, we ll examine the major features of Spark to see the advantages it has over the default view engine But first, let s walk through the installation and configuration process..

A short string that describes the general functionality of the program. This is displayed in the main dialog window, so it should not be too long. Copyright information about the application. This is displayed in the main dialog window, so it should not be too long. An example copyright string would be "(C) Copyright 2007 Author". A list of individuals who helped write documentation for the application. This often includes information such as an e-mail address or URL for each documenter, which will be displayed as a link. The content of the license for the application. This is displayed with a GtkTextView widget in a secondary dialog, so the length of the string does not matter. An image that will be displayed as the application s logo in the main window. If this is not set, gtk_window_get_default_icon_list() will be used. An icon name from the icon theme to use as the logo in the main About dialog. If this is set, it will take precedence over the logo property. The name of the application to display in the main About dialog. If you do not set this property, g_get_application_name() will be used. A string that holds information about the translator(s) for the current language. It should be set as translatable, so each translator can provide a custom string. This often includes information such as an e-mail address or URL for each translator, which will be displayed as a link. The version of the application that the user is running. A URL to the homepage for the application. This string must be prefixed with http://.