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What are the best practices for avoid xss attacks in a PHP site
I need to prevent XSS attacks in PHP code, is there nay good and easy library for this?
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Security is not a product. It's a process.
If you rely on a library for security you're doomed to being attacked one time or another.
Anyway, you could sanitize your inputs with standard php functions (i.e. htmlspecialchars())
Federico klez Culloca
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ok I added this to input that will be printed on page, will this prevent all XSS attacks or at least most of them ? – newbie Apr 16 '10 at 10:32
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I suggest you read up on XSS. You need to understand how it works to protect against it. – Marius Apr 16 '10 at 10:38
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2@newbie no, you don't. or you wouldn't ask will this prevent all XSS attacks – Your Common Sense Apr 16 '10 at 10:48
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There are lots of PHP functions that can assist you in preventing XSS attacks. Take a look at these:
strip_tags
http://php.net/manual/en/function.strip-tags.php
htmlspecialchars
Finbarr
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htmlentities is better to be removed from the list. as this function is obsolete and dirty – Your Common Sense Apr 16 '10 at 10:38
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Such a torrent of dirty functionality that it is hard to keep up with what is actually usable in PHP. – Finbarr Apr 16 '10 at 11:59
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Um, what? htmlentities is alive and well, and usually preferrable to htmlspecialchars http://php.net/manual/en/function.htmlentities.php – Kzqai Feb 26 '13 at 21:59
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Theres alot of good answers on google, first one I found; http://codeassembly.com/How-to-sanitize-your-php-input/
My main advice would be to consider every input as a direct attack.
So convert to html characters. Add slashes.
azz0r
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PHP: The current release of this project is not suitable for production use. – qwertzman Aug 24 '12 at 13:34
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htmlspecialchars()
Your Common Sense
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I noticed that too, it prevented alert('XSS attack test!'); from running, so it must be doing something – newbie Apr 16 '10 at 10:33
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