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PART IV
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Most browsers adopted the second security policy, restricting Java functionality on a client unless the program was loaded directly from the client s hard drive Although this solved many problems initially, it also severely limited functionality Today, browsers allow much more specific granularity on security for Java, based on security zones and user settings JavaScript is a form of Java designed to be operated within a browser instance The primary purpose of JavaScript is to enable features such as validation of forms before they are submitted to the server Enterprising programmers found many other uses for JavaScript, such as manipulating the browser history files, now prohibited by design JavaScript actually runs within the browser and the code is executed by the browser itself This has led to compatibility problems, and not just between vendors, such as Microsoft and Mozilla, but between browser versions Security settings in Internet Explorer are done by a series of zones, allowing differing level of control over Net functionality, ActiveX functionality, and Java functionality (see Figure 15-10) Unfortunately, these settings can be changed by a Trojan program, altering the browser without alerting the user and lowering the security settings In Firefox, using the NoScript add-in is a solution to this, but the reduced functionality leads to other issues, as shown in Figure 15-11, and requires more diligent user intervention Although JavaScript was designed not to be able to access files or network resources directly, except through the browser functions, it has not proven to be as secure as deFigure 15-10 Security settings in Internet Explorer 7
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15: Web Components
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Figure 15-1i Security setting functionality issues
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sired This fault traces back to a similar fault in the Java language, where security was added on, without the benefit of a comprehensive security model So, although designers put thought and common sense into the design, the lack of a comprehensive security model left some security holes For instance, a form could submit itself via e-mail to an undisclosed recipient, either eavesdropping, spamming, or causing other problems imagine your machine sending death threat e-mails to high-level government officials from a rogue JavaScript implementation Further, most browsers do not have a mechanism to halt a running script short of aborting the browser instance, and even this may not be possible if the browser has stopped responding to commands Malicious JavaScripts can do many things, including opening two new windows every time you close one, each with the code to open two more There is no way out of this one, short of killing the browser process from the operating system JavaScripts can also trick users into thinking they are communicating with one entity, when in fact they are communicating with another For example, a window may open asking whether you want to download and execute the new update from http://wwwmicrosoftcom /updateexe, and what is covered by the ellipsis ( ) is actually wwwmicrosoftcomattackerorg/ the user assumes this is a Microsoft address that is cut short by space restrictions on the display As a browser scripting language, JavaScript is here to stay Its widespread popularity for developing applets such as animated clocks, mortgage calculators, simple games, and the like will overcome its buggy nature and poor level of security Similarly, Java as a development language is also here to stay, although it may never live up to its initial hype and will continue to have security issues Both of these technologies boast many skilled developers, low learning curves (because of their heritage in the C language), and popularity in computer science courses When viewed as a total package, the marketplace has decided that the benefits outweigh the drawbacks, and these two technologies will be a cornerstone for much Internet programming development
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