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www.waraxe.us Forum Index -> Sql injection -> SQL Injection - Getting around addslashes()
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SQL Injection - Getting around addslashes()
PostPosted: Thu Aug 26, 2010 8:14 pm Reply with quote
shadowplayer
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Joined: Aug 26, 2010
Posts: 2




Hi guys =)

I'm stuck with this injection, please help me with some ideas.



The query is (watch quotes):

Code:
SELECT users.* FROM users WHERE true AND users.email = '{$email}'


Setting email to %00 (null) consumes the last single-quote in the query.


Problem:

Single-quotes (only single ones) are escaped by addslashes() (maybe magic_quotes). I've tried with multibyte chars like this:

Code:
email=%C0%27%00


Not working either... I'm getting escaped quotes.

Any ideas?
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Re: SQL Injection - Getting around addslashes()
PostPosted: Fri Aug 27, 2010 3:42 pm Reply with quote
shadowplayer
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Joined: Aug 26, 2010
Posts: 2




bump*!
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PostPosted: Mon Aug 30, 2010 1:15 am Reply with quote
julioisaias
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Joined: Jan 25, 2008
Posts: 50




Try with hex notation.

_________________
I study enough to make the rest a result.
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PostPosted: Mon Aug 30, 2010 11:19 am Reply with quote
waraxe
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Joined: May 11, 2004
Posts: 2407
Location: Estonia, Tartu




If magic_quotes_gpc=on or if addslashes(), mysql_escape_string(), mysql_real_escape_string() is used for incoming data sanitization, then there is no sql injection. Sql injection occurs when (examples) :

1. magic_quotes_gpc=off (easy to exploit)
2. stripslashes() is used (easy to exploit)
3. urldecode() or rawurldecode() is used (easy to exploit)
4. magic_quotes_runtime=off (second order injection, specific cases, hard to exploit)
5. specific cases related to sql truncation (hard to exploit)

By the way, when magic_quotes_gpc=on, then null byte (%00) trick will not work either, becasue it will be escaped too.
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SQL Injection - Getting around addslashes()
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