82e32acb77
* 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@301 4033779f-a91e-0410-96ef-6bf7bf53c507
671 lines
32 KiB
HTML
671 lines
32 KiB
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|
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|
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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
|
||
Exploit Thread Safety Problems <o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></b></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"'>Web
|
||
applications can handle many HTTP requests simultaneously. Developers often use
|
||
variables that are not thread safe. Thread safety means that the fields
|
||
of an object or class always maintain a valid state when used concurrently by
|
||
multiple threads. It is often possible to exploit a concurrency bug by loading
|
||
the same page as another user at the exact same time. <br>
|
||
Because all threads share the same method area, and the method area is where
|
||
all class variables are stored, multiple threads can attempt to use the same
|
||
class variables concurrently. <o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></b></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 the concurrency error in the web application and view
|
||
login information for another user that is attempting the same function at the
|
||
same time. <o:p></o:p></span></p>
|
||
|
||
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|
||
|
||
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'>This will
|
||
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|
||
|
||
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
|
||
|
||
<p class=MsoNormal style='page-break-after:avoid'><span style='font-size:8.0pt;
|
||
font-family:"Arial","sans-serif";mso-no-proof:yes'><!--[if gte vml 1]><v:shapetype
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id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t"
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|
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|
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|
||
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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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|
||
<v:f eqn="prod @7 21600 pixelHeight"/>
|
||
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|
||
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|
||
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|
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|
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|
||
<v:imagedata src="/WebGoat/lesson_solutions/ThreadSafetyProblem_files/image001.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=369
|
||
src="/WebGoat/lesson_solutions/ThreadSafetyProblem_files/image002.jpg" v:shapes="Picture_x0020_15"><![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]--> Lesson 2<span style='font-size:8.0pt;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"'>Open a new
|
||
browser window by pressing CTRL-N. Position the window so that you see both
|
||
input fields. Enter user name "dave" in the left window and user name "jeff" in
|
||
the right window.<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Click very
|
||
fast on the submit button in the right window and then in the left window.<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_16"
|
||
o:spid="_x0000_i1026" type="#_x0000_t75" style='width:480pt;height:262.5pt;
|
||
visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/ThreadSafetyProblem_files/image003.png" o:title=""
|
||
cropbottom="5791f"/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=350
|
||
src="/WebGoat/lesson_solutions/ThreadSafetyProblem_files/image004.jpg" v:shapes="Picture_x0020_16"><![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'><3E></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"'> 2 Browser Windows<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 result
|
||
should be that you receive the same data in both windows, even when using a
|
||
different user name!<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_35"
|
||
o:spid="_x0000_i1025" type="#_x0000_t75" style='width:480pt;height:274.5pt;
|
||
visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/ThreadSafetyProblem_files/image007.png" o:title=""
|
||
cropbottom="3061f"/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=366
|
||
src="/WebGoat/lesson_solutions/ThreadSafetyProblem_files/image009.jpg" v:shapes="Picture_x0020_35"><![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]--> Lesson 2 Completed<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><span style='font-family:"Arial","sans-serif"'>The root-cause
|
||
of this exploit is that the Java code uses a static variable for the user name.
|
||
When submitting twice, the same thread and hence the same static variable
|
||
containing the username of the first request will be used. <o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>This is
|
||
obvious when examining the Java code:<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"'>private
|
||
static String currentUser;<o:p></o:p></span></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>
|