From: Daniele Bellucci (daniele.bellucci@gmail.com)
Date: Mon Jul 17 2006 - 18:01:31 EDT
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> 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
looks like target webapp, doesn't require a result set greater than 1 record
> but
>
> ' and 'a'='a
>
> does.
Yes, this is because the above injection string will result only one
record!
> '+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.
be aware , INFORMATION_SCHEMA is not available in MySQL lesser than v.5!
> '+and'a'||'a'='aa
> Also error. Again means not Oracle
...and not postgres
> '+and'a'%2b'a'='aa
> This is weird. No error but no result either. Empty screen. Not MS SQL and
> many others. Why?
[see below]
> '+and+concat('a','a')='aa
> Also works and provides result
concat is ONLY available in mysql! Postgres, Oracle, M$ SQL Serve
they all have different function for strings concats.
Other DBMS uses different function to concatenatre strings ..
that's why IMHO target DBMS is MySql!
> '+and+concat('a','a')='a
> emtpy screen
because in MySQL: select concat('a','a') returns 'aa'
Hope these helps ;)
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