greensql firewall permanent xss Sep 21 2007 07:24PM
laurent gaffie gmail com
Site: http://greensql.net/
live-demo: http://demo.greensql.net/
Platform: alls
Bug: permanent xss
Special condition: none
Impact : semi-critical
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1) Introduction
2) Bug
3) Proof of concept
4) Credits
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1) Introduction
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GreenSQL is an Open Source database firewall used to protect databases from SQL injection attacks. GreenSQL works in a proxy mode and has built in support for MySQL. The logic is based on evaluation of SQL commands using a risk scoring matrix as well as blocking known db administrative commands (DROP, CREATE, etc).
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2) Bug
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permanent xss

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3)Proof of concept
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well the proof of concept can be anywhere , like a login form, an url value everythings is loggued in the green-sql
admin panel. the problem is because there's no filter , so the script logs your query in the database
and then it's printed in the alert section . this can be pretty nastie ... you "protect" your script agains sql injection with a firewall , but you have a permanent xss in the panel . and actually only the admin see the logs .
so you know that the cookie is the good one !

an exemple can be given in the demo website :
http://www.greensql.net/sql-injection-test fill login or password with <script>alert(document.cookie)</script>
then go in the admin panel :http://demo.greensql.net/ xss will be executed .

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5)Credits
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Laurent gaffie
contact : laurent.gaffie (at) gmail (dot) com [email concealed]

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