XSS Attacks: Cross Site Scripting Exploits and Defense by Seth Fogie, Jeremiah Grossman, Robert Hansen, Anton Rager,

By Seth Fogie, Jeremiah Grossman, Robert Hansen, Anton Rager, Petko D. Petkov

Cross web site Scripting Attacks starts off through defining the phrases and laying out the floor paintings. It assumes that the reader is aware easy internet programming (HTML) and JavaScript. First it discusses the strategies, technique, and expertise that makes XSS a legitimate difficulty. It then strikes into many of the different types of XSS assaults, how they're applied, used, and abused. After XSS is punctiliously explored, the following half offers examples of XSS malware and demonstrates actual situations the place XSS is a perilous probability that exposes web clients to distant entry, delicate information robbery, and fiscal losses. ultimately, the publication closes by means of reading the methods builders can stay away from XSS vulnerabilities of their internet functions, and the way clients can steer clear of turning into a sufferer. The viewers is net builders, defense practitioners, and bosses.

*XSS Vulnerabilities exist in eight out of 10 internet sites
*The authors of this ebook are the undisputed best authorities
*Contains self sufficient, bleeding area study, code listings and exploits that cannot be discovered anyplace else

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Extra info for XSS Attacks: Cross Site Scripting Exploits and Defense

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22 Live HTTP Headers POST Replay In addition to GET and POST requests, you can also use this tool to perform Web server testing via the TRACE,TRACK, and OPTIONS method. For example, by entering the following into the Replay tool, you can test to see if a Web server allows unrestricted file uploads. qxd 4/19/07 3:20 PM Page 39 The XSS Discovery Toolkit • Chapter 2 The last item we want to discuss is how to filter out unwanted request types, which can reduce the amount of data you have to sort through when reviewing large Web applications.

Having this ability allows you to make changes, view the results, and continue on with your browsing session. As previously mentioned, you can change any part of the request via the Replay feature. 22 illustrates. The problem is that LiveHTTPReplay does not dynamically calculate the Content-Length header-value pair into the request. While most Web server/applications do not care if the value is missing, the header is necessary if the request is to be RFC compliant. By not including the value, you take the chance of raising an alert if there is an Intrusion Detection System (IDS) monitoring the Web traffic.

In simple terms, your browser did not specify which virtual host needs to be used in order to make the application work. In order to specify the virtual host name you have to use the Host header. 27 shows the Host header injected in the Modify Headers window. Probably one of the most useful purposes of this extension is to locate XSS vulnerabilities that occur when different encodings are used. Keep in mind that XSS issues are not that straightforward, and if you cannot find a particular application vulnerability when using the default configuration of your browser, it may appear as such if you change a few things, like the accepted charset as discussed previously in this section.

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