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<div class=Section1>
<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
Exploit Hidden Fields <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"'>Developers
will use hidden fields for tracking, login, pricing, etc.. information on a
loaded page. While this is a convenient and easy mechanism for the developer,
they often don't validate the information that is received from the hidden
field. This lesson will teach the attacker to find and modify hidden fields to
obtain a product for a price other than the price specified <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"'>The user
should be able to exploit a hidden field to obtain a product at an incorrect
price.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
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<v:f eqn="if lineDrawn pixelLineWidth 0"/>
<v:f eqn="sum @0 1 0"/>
<v:f eqn="sum 0 0 @1"/>
<v:f eqn="prod @2 1 2"/>
<v:f eqn="prod @3 21600 pixelWidth"/>
<v:f eqn="prod @3 21600 pixelHeight"/>
<v:f eqn="sum @0 0 1"/>
<v:f eqn="prod @6 1 2"/>
<v:f eqn="prod @7 21600 pixelWidth"/>
<v:f eqn="sum @8 21600 0"/>
<v:f eqn="prod @7 21600 pixelHeight"/>
<v:f eqn="sum @10 21600 0"/>
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src="/WebGoat/lesson_solutions/HiddenFieldTampering_files/image011.jpg" v:shapes="Picture_x0020_103"><![endif]></span></p>
<p class=MsoCaption>Figure <!--[if supportFields]><span style='mso-element:
field-begin'></span><span style='mso-spacerun:yes'>�</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]--> Lesson 4<span style='font-family:"Arial","sans-serif"'><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 style='mso-bidi-font-weight:normal'><span
style='font-family:"Arial","sans-serif"'>Solution:<o:p></o:p></span></b></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"'>To change the
hidden field you need to start your favorite HTTP Interceptor. You can use
WebScarab from OWASP to intercept the request and change the hidden field.
Configure your browser to use a local proxy. In Internet Explorer you can do
this via "Tools" � "Internet Options" � "Connections" � "LAN Settings". You
must define proxy "localhost" with port 8008.<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:
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</v:shape><![endif]--><![if !vml]><img width=384 height=339
src="/WebGoat/lesson_solutions/HiddenFieldTampering_files/image012.jpg" v:shapes="Picture_x0020_104"><![endif]></span><span
style='font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoCaption><span style='font-family:"Arial","sans-serif"'>Figure </span><!--[if supportFields]><span
style='font-family:"Arial","sans-serif"'><span style='mso-element:field-begin'></span><span
style='mso-spacerun:yes'>�</span>SEQ Figure \* ARABIC <span style='mso-element:
field-separator'></span></span><![endif]--><span style='font-family:"Arial","sans-serif"'><span
style='mso-no-proof:yes'>2</span></span><!--[if supportFields]><span
style='font-family:"Arial","sans-serif"'><span style='mso-element:field-end'></span></span><![endif]--><span
style='font-family:"Arial","sans-serif"'> Set local proxy in Internet Explorer<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"'>Start
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:
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style='font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoCaption><span style='font-family:"Arial","sans-serif"'>Figure </span><!--[if supportFields]><span
style='font-family:"Arial","sans-serif"'><span style='mso-element:field-begin'></span><span
style='mso-spacerun:yes'>�</span>SEQ Figure \* ARABIC <span style='mso-element:
field-separator'></span></span><![endif]--><span style='font-family:"Arial","sans-serif"'><span
style='mso-no-proof:yes'>3</span></span><!--[if supportFields]><span
style='font-family:"Arial","sans-serif"'><span style='mso-element:field-end'></span></span><![endif]--><span
style='font-family:"Arial","sans-serif"'> Intercept request with WebScarab<o:p></o:p></span></p>
<p class=MsoNormal style='page-break-after:avoid'><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:
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</v:shape><![endif]--><![if !vml]><img width=640 height=369
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style='font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoCaption><span style='font-family:"Arial","sans-serif"'>Figure </span><!--[if supportFields]><span
style='font-family:"Arial","sans-serif"'><span style='mso-element:field-begin'></span><span
style='mso-spacerun:yes'>�</span>SEQ Figure \* ARABIC <span style='mso-element:
field-separator'></span></span><![endif]--><span style='font-family:"Arial","sans-serif"'><span
style='mso-no-proof:yes'>4</span></span><!--[if supportFields]><span
style='font-family:"Arial","sans-serif"'><span style='mso-element:field-end'></span></span><![endif]--><span
style='font-family:"Arial","sans-serif"'> Change the Price variable to 1<o:p></o:p></span></p>
<p class=MsoCaption><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:
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style='font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoCaption><span style='font-family:"Arial","sans-serif"'>Figure </span><!--[if supportFields]><span
style='font-family:"Arial","sans-serif"'><span style='mso-element:field-begin'></span><span
style='mso-spacerun:yes'>�</span>SEQ Figure \* ARABIC <span style='mso-element:
field-separator'></span></span><![endif]--><span style='font-family:"Arial","sans-serif"'><span
style='mso-no-proof:yes'>5</span></span><!--[if supportFields]><span
style='font-family:"Arial","sans-serif"'><span style='mso-element:field-end'></span></span><![endif]--><span
style='font-family:"Arial","sans-serif"'> Lesson 4 Completed<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><o:p> </o:p></p>
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<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>
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