wirth.marcel e2ca7f9a33 Minor Bugfixes
git-svn-id: http://webgoat.googlecode.com/svn/trunk@338 4033779f-a91e-0410-96ef-6bf7bf53c507
2008-04-14 13:28:25 +00:00

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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 Perform Numeric SQL Injection <o:p></o:p></span></p>
<p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'><o:p>&nbsp;</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>
<!-- Start Instructions -->
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>
SQL injection attacks represent a serious threat to any database-driven site. The methods behind an attack are easy to learn and the damage caused can range from considerable to complete system compromise. Despite these risks, an incredible number of systems on the internet are susceptible to this form of attack.
Not only is it a threat easily instigated, it is also a threat that, with a little common-sense and forethought, can easily be prevented.
It is always good practice to sanitize all input data, especially data that will used in OS command, scripts, and database queiries, even if the threat of SQL injection has been prevented in some other manner.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p>&nbsp;</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 form below allows a user to view weather data. Try to inject an SQL string that results in all the weather data being displayed.
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p>&nbsp;</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>&nbsp;</o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>The
application is taking the input from the select box and inserts it at the end of a pre-formed
SQL command.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Compound SQL
statements can be made by joining multiple tests with keywords like AND and OR.
Try appending a SQL statement that always resolves to true.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>This is the
query: SELECT * FROM weather_data WHERE station = 101<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Intercept the post request with WebScarab and replace 101 with 101 or 1=1!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p>&nbsp;</o:p></span></p>
<img src = "/WebGoat/lesson_solutions/SqlNumericInjection_files/numericinjection.png" width=350px>
<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]--> Intercepted Request with WebScarab<span style='font-family:
"Arial","sans-serif"'><o:p></o:p></span></p>
<br/>
<br/>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>As the SQL Statement is true for every station you get
a list of all stations:<o:p></o:p></span></p>
<img src = "/WebGoat/lesson_solutions/SqlNumericInjection_files/numericinjection_solved.png" width=350px>
<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]--> All stations are visible<span style='font-family:
"Arial","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><o:p>&nbsp;</o:p></p>
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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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