This improves the text of the lesson about XSS
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== Identify Potential for DOM-Based XSS
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== Identify Potential for DOM-Based XSS
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DOM-Based XSS can usually be found by looking for the route configurations in the client-side code.
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DOM-Based XSS can usually be found by looking for the route configurations in the client-side code.
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Look for a route that takes inputs that you can ID being 'reflected' to the page.
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Look for a route that takes inputs that are being 'reflected' to the page.
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For this example, you'll want to look for some 'test' code in the route handlers (WebGoat uses backbone as its primary javascript library).
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For this example, you'll want to look for some 'test' code in the route handlers (WebGoat uses backbone as its primary javascript library).
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Sometimes, test code gets left in production (and often times test code is very simple and lacks security or any quality controls!).
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Sometimes, test code gets left in production (and often times test code is very simple and lacks security or any quality controls!).
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Your objective is to find the route and exploit it. First though ... what is the base route? As an example, look at the URL for this lesson ...
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Your objective is to find the route and exploit it. First though ... what is the base route? As an example, look at the URL for this lesson ...
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it should look something like /WebGoat/start.mvc#lesson/CrossSiteScripting.lesson/9 (although maybe slightly different). The 'base route' in this case is:
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it should look something like /WebGoat/start.mvc#lesson/CrossSiteScripting.lesson/9. The 'base route' in this case is:
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*start.mvc#lesson/*
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*start.mvc#lesson/*
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The *CrossSiteScripting.lesson/9* after that are parameters that are processed by the javascript route handler.
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The *CrossSiteScripting.lesson/#* after that are parameters that are processed by javascript route handler.
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So, what is the route for the test code that stayed in the app during production?
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To answer this question, you have to check the javascript source.
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So, what is test route for this test code?
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@ -8,4 +8,4 @@ The function you want to execute is ...
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Sure, you could just use console/debug to trigger it, but you need to trigger it via a URL in a new tab.
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Sure, you could just use console/debug to trigger it, but you need to trigger it via a URL in a new tab.
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Once you do trigger it, a subsequent response will come to the browser with a random number. Put that random number in below.
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Once you do trigger it, a subsequent response will come to your browser's console with a random number. Put that random number in below.
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