6a96547ef0
git-svn-id: http://webgoat.googlecode.com/svn/branches/webgoat-6.0@485 4033779f-a91e-0410-96ef-6bf7bf53c507
39 lines
1.9 KiB
HTML
39 lines
1.9 KiB
HTML
<div align="Center">
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<p><b>Lesson Plan Title:</b>CSRF Token Prompt By-Pass</p><br/>
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</div>
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<p><b>Concept / Topic To Teach:</b> </p>
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This lesson teaches how to perform CSRF attacks on sites that use tokens to mitigate CSRF attacks, but are vulnerable to CSS attacks.
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<br>
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<div align="Left">
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<p>
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<b>How the attacks works:</b>
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</p>
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<p>
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Cross-Site Request Forgery (CSRF/XSRF) is an attack that tricks the victim into
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loading a page that contains a 'forged request' to execute commands with the
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victim's credentials. </p>
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<p>Token-based request authentication mitigates these attacks. This technique
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inserts tokens into pages that issue requests. These tokens are required to
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complete a request, and help verify that requests are not scripted. CSRFGuard from OWASP uses
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this technique to help prevent CSRF attacks.</p>
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<p>However, this technique can be by-passed if CSS vulnerabilities exist on the same site.
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Because of the same-origin browser policy, pages from the same domain can read content from
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other pages from the same domain. </p>
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</div>
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<p><b>General Goal(s):</b> </p>
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<!-- Start Instructions -->
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Similar to the CSRF Lesson, your goal is to send an email to a newsgroup that contains a malicious
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request to transfer funds. To successfully complete you need to obtain a valid request token.
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The page that presents the transfer funds form contains a valid request token. The URL for the
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transfer funds page is the same as this lesson with an extra parameter "transferFunds=main". Load
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this page, read the token and append the token in a forged request to transferFunds. When you think
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the attack is successful, refresh the page and you will find the green check on the left hand side menu.<br/>
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<b>Note that the "Screen" and "menu" GET variables will vary between WebGoat builds. Copying the menu link on the left will give you the current values.</b>
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<!-- Stop Instructions -->
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