Javascript is an interpreted language often used to liven up the web page. The syntax is quite similar to Java (and hence that of C + +), but other languages are not related. It is used for many different things, from providing input fields for validation of the pop-up drive, to give a different atmosphere to an ‘application, even to a complete and free replacement of the normal functions of HTML.

There are many risks associated with JavaScript, sometimes it is complicit in the attacks of evil.

JavaScript does not provide access to the filesystem or network connection, but you can control elements such as windows and the browser address bar. In this way, users may be led to detect passwords and other personal information believed to browse a site while they are in fact a ‘else.

Javascript attacks

An attack known as Cross-Site Scripting demonstrates how JavaScript can be used for hostile purposes. The Cross-Site Scripting is possible when a website can be tricked to serve script composed by a hacker.

For example, the site allows users to enter Ebay item descriptions in HTML format. A user could write a JavaScript SCRIPT tags and insert in the description. Another user could then happen on ebay and select the object: JavaScript would be downloaded and executed on the victim’s browser. Javascript can trick you and take your opponent to reveal some private information by incorporating a reference to a CGI script on the site of ‘hacker who provides the’ input ‘s user.

The JavaScript was often used by viruses and other exploits to propagate malicious code.

The Nimda worm, for example enclosing a small piece of JavaScript to each file containing material on the web server infected. JavaScript was that the worm will continue to copy itself to other clients on the web browser.

Useful but dangerous

In practice, many sites, especially the main ones, know this attack and filter JavaScript, but unfortunately there are too many sites that do not. In addition to filter JavaScript is much more difficult than it might seem.

Javascript is a programming language can be used very useful in many situations, but you must always treat a lot of attention because its capabilities are also used by bad guys to cause damage to our cars, a useful tool, but also dangerous.

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