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
866 lines
40 KiB
HTML
866 lines
40 KiB
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|
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|
||
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'>Lesson
|
||
Plan Title:</span></b><span style='font-family:"Arial","sans-serif"'> How to
|
||
Perform DOM Injection Attack. <o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
|
||
|
||
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'>Concept /
|
||
Topic To Teach:</span></b><span style='font-family:"Arial","sans-serif"'> <o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>How to
|
||
perform DOM injection attacks. <o:p></o:p></span></p>
|
||
|
||
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|
||
|
||
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'>How the
|
||
attacks works:</span></b><span style='font-family:"Arial","sans-serif"'> <o:p></o:p></span></p>
|
||
|
||
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|
||
specially the ones that uses AJAX manipulates and updates the DOM directly
|
||
using JavaScript, DHTML and eval() method.<br>
|
||
An attacker may take advantage of that by intercepting the reply and try to
|
||
inject some javascript commands to exploit his attacks. <o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
|
||
|
||
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'>General
|
||
Goal(s):</span></b><span style='font-family:"Arial","sans-serif"'> <o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><!-- Start Instructions -->*
|
||
Your victim is a system that takes an activation key to allow you to use it.<br>
|
||
* Your goal should be to try to get to enable the activate button.<br>
|
||
* Take some time to see the HTML source in order to understand how the key
|
||
validation process works.<o:p></o:p></span></p>
|
||
|
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|
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"Arial","sans-serif";mso-no-proof:yes'><!--[if gte vml 1]><v:shapetype id="_x0000_t75"
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filled="f" stroked="f">
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|
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|
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|
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|
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|
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<v:f eqn="sum @0 0 1"/>
|
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|
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|
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|
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|
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<v:f eqn="sum @10 21600 0"/>
|
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</v:formulas>
|
||
<v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/>
|
||
<o:lock v:ext="edit" aspectratio="t"/>
|
||
</v:shapetype><v:shape id="Picture_x0020_49" o:spid="_x0000_i1030" type="#_x0000_t75"
|
||
style='width:480pt;height:277.5pt;visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/DOMInjection_files/image001.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=370
|
||
src="/WebGoat/lesson_solutions/DOMInjection_files/image002.jpg" v:shapes="Picture_x0020_49"><![endif]></span></p>
|
||
|
||
<p class=MsoCaption>Figure <!--[if supportFields]><span style='mso-element:
|
||
field-begin'></span><span style='mso-spacerun:yes'><3E></span>SEQ Figure \* ARABIC
|
||
<span style='mso-element:field-separator'></span><![endif]--><span
|
||
style='mso-no-proof:yes'>1</span><!--[if supportFields]><span style='mso-element:
|
||
field-end'></span><![endif]--> AJAX Security - DOM Injection</p>
|
||
|
||
<p class=MsoNormal><o:p> </o:p></p>
|
||
|
||
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'>Solution:<o:p></o:p></span></b></p>
|
||
|
||
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></b></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>AJAX requires
|
||
XML communication between the browser and the web application. When you view
|
||
the source of the HTML page, you will notice the usage of XMLHttpRequest:<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><script><o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>function
|
||
validate() {<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>var keyField
|
||
= document.getElementById('key');<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>var url =
|
||
'/WebGoat/attack?Screen=80&menu=1150&from=ajax&key=' +
|
||
encodeURIComponent(keyField.value);<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>if (typeof
|
||
XMLHttpRequest != 'undefined') {<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal style='text-indent:36.0pt'><span style='font-family:"Arial","sans-serif"'>req
|
||
= new XMLHttpRequest();<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>} else if
|
||
(window.ActiveXObject) {<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal style='text-indent:36.0pt'><span style='font-family:"Arial","sans-serif"'>req
|
||
= new ActiveXObject('Microsoft.XMLHTTP');<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><span
|
||
style='mso-spacerun:yes'><EFBFBD><EFBFBD> </span>}<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><span
|
||
style='mso-spacerun:yes'><EFBFBD><EFBFBD> </span>req.open('GET', url, true);<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><span
|
||
style='mso-spacerun:yes'><EFBFBD><EFBFBD> </span>req.onreadystatechange = callback;<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><span
|
||
style='mso-spacerun:yes'><EFBFBD><EFBFBD> </span>req.send(null);<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>}<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>function
|
||
callback() {<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><span
|
||
style='mso-spacerun:yes'><EFBFBD><EFBFBD><EFBFBD> </span>if (req.readyState == 4) { <o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><span
|
||
style='mso-spacerun:yes'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span>if (req.status == 200) { <o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><span
|
||
style='mso-spacerun:yes'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span>var message = req.responseText;<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><span
|
||
style='mso-tab-count:3'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span><span
|
||
style='mso-spacerun:yes'><EFBFBD></span>eval(message);<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><span
|
||
style='mso-spacerun:yes'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span>}}}<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'></script><o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>The XML
|
||
response contains JavaScript that will activate the button so that you are able
|
||
to click on it. This requires you to inject JavaScript to manipulate the
|
||
Document Object Model of the HTML page in the browser. This requires
|
||
intercepting the HTTP response in WebScarab!<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Enter a
|
||
license key (for example 'a') and intercept the HTTP Request and HTTP Response
|
||
in WebScarab.<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
|
||
|
||
<p class=MsoNormal style='page-break-after:avoid'><span style='font-family:
|
||
"Arial","sans-serif";mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_50"
|
||
o:spid="_x0000_i1029" type="#_x0000_t75" style='width:481.5pt;height:345pt;
|
||
visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/DOMInjection_files/image003.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=642 height=460
|
||
src="/WebGoat/lesson_solutions/DOMInjection_files/image004.jpg" v:shapes="Picture_x0020_50"><![endif]></span></p>
|
||
|
||
<p class=MsoCaption>Figure <!--[if supportFields]><span style='mso-element:
|
||
field-begin'></span><span style='mso-spacerun:yes'><3E></span>SEQ Figure \* ARABIC
|
||
<span style='mso-element:field-separator'></span><![endif]--><span
|
||
style='mso-no-proof:yes'>2</span><!--[if supportFields]><span style='mso-element:
|
||
field-end'></span><![endif]--> HTTP Request</p>
|
||
|
||
<p class=MsoNormal><o:p> </o:p></p>
|
||
|
||
<p class=MsoNormal style='page-break-after:avoid'><span style='mso-no-proof:
|
||
yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_51" o:spid="_x0000_i1028"
|
||
type="#_x0000_t75" style='width:481.5pt;height:345pt;visibility:visible;
|
||
mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/DOMInjection_files/image005.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=642 height=460
|
||
src="/WebGoat/lesson_solutions/DOMInjection_files/image006.jpg" v:shapes="Picture_x0020_51"><![endif]></span></p>
|
||
|
||
<p class=MsoCaption>Figure <!--[if supportFields]><span style='mso-element:
|
||
field-begin'></span><span style='mso-spacerun:yes'><3E></span>SEQ Figure \* ARABIC
|
||
<span style='mso-element:field-separator'></span><![endif]--><span
|
||
style='mso-no-proof:yes'>3</span><!--[if supportFields]><span style='mso-element:
|
||
field-end'></span><![endif]--> HTTP Response</p>
|
||
|
||
<p class=MsoNormal><o:p> </o:p></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Intercept the
|
||
reply and replace the body with document.forms[0].SUBMIT.disabled = false;<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
|
||
|
||
<p class=MsoNormal style='page-break-after:avoid'><span style='font-family:
|
||
"Arial","sans-serif";mso-no-proof:yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_52"
|
||
o:spid="_x0000_i1027" type="#_x0000_t75" style='width:481.5pt;height:345pt;
|
||
visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/DOMInjection_files/image007.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=642 height=460
|
||
src="/WebGoat/lesson_solutions/DOMInjection_files/image008.jpg" v:shapes="Picture_x0020_52"><![endif]></span></p>
|
||
|
||
<p class=MsoCaption>Figure <!--[if supportFields]><span style='mso-element:
|
||
field-begin'></span><span style='mso-spacerun:yes'><3E></span>SEQ Figure \* ARABIC
|
||
<span style='mso-element:field-separator'></span><![endif]--><span
|
||
style='mso-no-proof:yes'>4</span><!--[if supportFields]><span style='mso-element:
|
||
field-end'></span><![endif]--> Updated HTTP Response</p>
|
||
|
||
<p class=MsoNormal><o:p> </o:p></p>
|
||
|
||
<p class=MsoNormal>The button <20>Activate!<21> is now enabled!</p>
|
||
|
||
<p class=MsoNormal><o:p> </o:p></p>
|
||
|
||
<p class=MsoNormal style='page-break-after:avoid'><span style='mso-no-proof:
|
||
yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_53" o:spid="_x0000_i1026"
|
||
type="#_x0000_t75" style='width:480pt;height:277.5pt;visibility:visible;
|
||
mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/DOMInjection_files/image009.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=370
|
||
src="/WebGoat/lesson_solutions/DOMInjection_files/image010.jpg" v:shapes="Picture_x0020_53"><![endif]></span></p>
|
||
|
||
<p class=MsoCaption>Figure <!--[if supportFields]><span style='mso-element:
|
||
field-begin'></span><span style='mso-spacerun:yes'><3E></span>SEQ Figure \* ARABIC
|
||
<span style='mso-element:field-separator'></span><![endif]--><span
|
||
style='mso-no-proof:yes'>5</span><!--[if supportFields]><span style='mso-element:
|
||
field-end'></span><![endif]--> Activate! Button is enabled</p>
|
||
|
||
<p class=MsoNormal><o:p> </o:p></p>
|
||
|
||
<p class=MsoNormal style='page-break-after:avoid'><span style='mso-no-proof:
|
||
yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_54" o:spid="_x0000_i1025"
|
||
type="#_x0000_t75" style='width:480pt;height:277.5pt;visibility:visible;
|
||
mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/DOMInjection_files/image011.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=370
|
||
src="/WebGoat/lesson_solutions/DOMInjection_files/image012.jpg" v:shapes="Picture_x0020_54"><![endif]></span></p>
|
||
|
||
<p class=MsoCaption>Figure <!--[if supportFields]><span style='mso-element:
|
||
field-begin'></span><span style='mso-spacerun:yes'><3E></span>SEQ Figure \* ARABIC
|
||
<span style='mso-element:field-separator'></span><![endif]--><span
|
||
style='mso-no-proof:yes'>6</span><!--[if supportFields]><span style='mso-element:
|
||
field-end'></span><![endif]--> Lesson completed</p>
|
||
|
||
<p class=MsoNormal><o:p> </o:p></p>
|
||
|
||
</div>
|
||
<table align='RIGHT' cellspacing='0' width='90%' border='0' cellpadding='0'>
|
||
<tr>
|
||
<td valign='MIDDLE' width='100%' align='RIGHT class=MsoNormal' style='font-family:"Arial","sans-serif"'>
|
||
Solution by Erwin Geirnaert
|
||
</td>
|
||
<td valign='MIDDLE' align='RIGHT'><img hspace='0' vspace='0' border='0' alt='ZION SECURITY' src='images/logos/zionsecurity.gif'></td>
|
||
</tr>
|
||
</table>
|
||
|
||
</body>
|
||
|
||
</html>
|