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There are three main things that the Morris worm did to propagate from one server to another: (1) it attempted to use a buffer overflow vulnerability in the finger daemon server, (2) it took advantage of the debug mode in sendmail, and (3) it tried to remotely log into hosts using common usernames and passwords There are many lessons to be learned from the Morris worm A first is that diversity is good The Morris worm took advantage of vulnerabilities in UNIX servers Since most UNIX systems function the same way, the Morris worm was able to rely on certain vulnerabilities existing on all of these hosts Therefore, from a security standpoint, homogeneity of operating systems makes it easier for an attacker to predictably exploit system vulnerabilities if the vulnerability exists on one system, it exists on all of them.

Pages of a print operation in GTK+ are rendered as cairo_t objects. This object allows you to render text, draw various shapes and lines, and fill clipped areas with color. Let us look at a few functions provided by Cairo for manipulating Cairo drawing contexts.

The ChildActionOnly attribute prevents the ChildAction method from being exposed as a web-callable action that can be invoked by a web browser. But it can still be invoked by making a call to RenderAction from within a view, as follows:

It may seem strange that the behavior defined in the attribute is called when the action is invoked. At runtime, the method isn t called directly; it s passed to the ControllerActionInvoker, which reads the action filters that are present on the controller and action. This is a nice extension point in the framework, because you re allowed to substitute your own IActionInvoker if you want to customize the semantics. During unit tests, you ll be calling action methods directly. None of the behavior defined in the action filters will be executed, so you should treat your tests as if the action filters were executed (for example, load any data into ViewData that would ve been loaded by an action filter). To test whether filters such as [Authorize] or [HttpPost] have been applied, you can easily test for the existence of the attribute by using reflection. Here s a class that can help you simplify the reflection code required to get attributes:

Shapes in Cairo contexts are rendered with paths. A new path is created with cairo_new_path(). You can then retrieve a copy of the new path with cairo_copy_path() and add new lines and shapes to the path. cairo_path_t* cairo_copy_path (cairo_t *cairo_context); There are a number of functions provided for drawing paths, which are listed in Table 12-1. More information about each function can be found in the Cairo API documentation. Table 12-1. Cairo Path-Drawing Functions

Heterogeneity in operating systems would have made the Morris worm s job harder This lesson is still true today Even with some of the more recent worms that have been successful at infecting many hosts, the large market share that some operating systems companies have can sometimes be a disadvantage from a security standpoint For instance, if there is a vulnerability somewhere in the Microsoft Windows operating system, and 90 percent of the Internet population runs Microsoft, an attacker can rely on any particular vulnerability being on most of the machines they want to attack A second lesson that we learned is that large programs are particularly vulnerable to attack The sendmail program is very large and has lots of lines of code With any program that large, it is difficult to be able to go through it line by line and comb it for all possible security vulnerabilities.

public static class ReflectionExtensions { public static TAttribute GetAttribute<TAttribute>( this MemberInfo member) where TAttribute : Attribute {

cairo_arc()

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Big programs are likely to have more bugs and more exploitable vulnerabilities that worms and other attackers can take advantage of At the same time, we should keep in mind that just because a program is small, it does not necessarily make it any less vulnerable to attack The fingerd program is small compared to sendmail, yet the Morris worm was able to take advantage of a buffer overflow in it A third lesson from the Morris worm is the importance for users to choose good passwords A good password is one that is hard for an attacker to guess As was the case with the Morris worm, an attacking person or program can simply use a prepackaged list of common passwords to get access to some user account.