Re: Magic Quotes question

[Sir Mordred <sir.mordred.lists () gmail com>]

> I posted this earlier to webappsec () securityfocus com with no luck ,
> does anyone know how to bypass magic quotes? a proven working way .

> example is, in such a simple SQL like
>  "SELECT * from USERS WHERE id =$id";

Magic quotes, as well as the correct db-specific escaping functions
(like mysql_real_escape_string() for MySQL) will not work if the query
itself is written badly, as in your example. Here is the correct
syntax, which cannot be exploited if the input was escaped, or if
magic quotes are enabled:

SELECT * from USERS WHERE id='$id'

> I am looking for ways to by pass magic quotes to inject this
> INTO OUTFILE '/home/z.php'

That said, INTO OUTFILE will only work with a literal string (at least
in MySQL, not sure of others), which means you have to use ' or ",
which are escaped by magic quotes.

In other situations where a value is unquoted in the query, you use
CHAR(39,....,39) to represent quotes. To use the above vulnerability
you can try $id=id, $id=1 or 1, $id>4, unions with another table, etc.
and see if any of the selected data is displayed. If not, you'll have
to do with blind sql injection techniques.

Mordred


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