Ethical Hacking - Web Penetration Testing(11)
SQL INJECTION
Preventing SQLi
- Filters can be bypassed.
- Use a blacklist of commands? Still can be bypassed.
- Use whitelist? Same issue.
-> Use parameterized statements, separate data from SQL code.
<?php
//$textbox1 = admin' union select #
Select * from accounts where username = '$textbox1'
//Bad Sample: Select * from accounts where username = 'admin' union select #' Safe:
->prepare(Select * from accounts where username = ?")
->execute(array('$textbox1')) //prepare(Select * from accounts where username = "'admin' union select #'")
//execute(array('admin' union select #'))
?>
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