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How to Break Web Software: Functional and Security Testing by Mike Andrews

By Mike Andrews

For the reason that its early days as a knowledge alternate instrument restricted to academe, researchers, and the army, the net has grown right into a trade engine that's now omnipresent in all elements of our lifes. extra web pages are created day-by-day and extra purposes are constructed to permit clients to benefit, examine, and buy on-line. hence, net improvement is frequently rushed, which raises the danger of assaults from hackers. in addition, the necessity for safe functions needs to be balanced with the necessity for usability, functionality, and reliability. during this e-book, Whittaker and Andrews show how rigorous net trying out may help hinder and get ready for such assaults. They indicate that systematic checking out needs to contain deciding upon threats and assault vectors to set up after which enforce the precise checking out options, guide or automatic.

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4967296 seconds has passed, in units of 10-7 seconds. com. We are given our credit rating report online, but it expires in 30 days. com enforces this policy by issuing a cookie with the report ID that expires in a month. txt Now we can open the cookie in WordPad, as shown in Figure 4-10. Figure 4-10. Cookie for a sample credit report application. 55 56 If we change the 29592292 value to 29598326, we can access the report for an extra 30 days. The designer of this Web site probably didn't intend for us to do that.

So far, we've talked about CGI parameters passed in the browser's address bar, which are known as GET parameters. " POST parameters are not as obvious to the end user, or as easy to change, and are passed to the Web server in a slightly different way than GET parameters. This means that we cannot as easily modify them using techniques we have introduced thus far; we must use something to help us. Enter Paros Proxy 0, the authors' favorite Web testing tool. Paros is described more fully in Appendix C, "Tools," but it allows you to see and modify all HTTP traffic to and from the Web server.

The problem is that the Web has no built-in mechanism that specifies which sequence of Web pages and forms are presented to the user. This aspect of the Web is called statelessness to denote that each page is delivered to users without knowledge of where the users were previously or restrictions about where they can go next. Users can simply type in the URL of the page they want to load, skipping the start page and any other page they do not need to view. If restrictions about page access are important, it is up to the Web application to enforce this.

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