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Re: JS XSS protection library
From: d4x <d4x () hackers it>
Date: Wed, 17 Jul 2013 09:06:44 +0200

Hi Robin,
Recently I'm trying to secure my websites against XSS with injection of JS in many ways. Unfortunately these solutions 
doesn't seem to work properly. 

OSWAP basically say to work on whitelists, and (with Ruby) the Sanitize gem is helping giving a first level of 
protection, stripping *all* malicious tags from params...but it's not enough. 

Some tries ( I.e starting with %22%20onmouseover) are still painful and at this point I'm writing some code to escape 
but I am back to blacklisting, which smell like a neverending run. 

Adding code for stupid params like locale also slow down performance, but is it a secondary problem. 

d4x

Sent from my mobile

On 14/lug/2013, at 09:41, Robin Wood <robin () digininja org> wrote:

Thanks for the suggestions, as long as it gives the impression it is filtering I'm happy so I'll see which of these 
is the easiest to drop in.

Robin

On Jul 14, 2013 3:47 AM, "Ryan Dewhurst" <ryandewhurst () gmail com> wrote:
The OWASP DOM XSS Prevention Cheat Sheet (if you haven't come across it already) lists these:

"
1.ESAPI
2.Apache Commons String Utils
3.Jtidy
4.Your company’s custom implementation.

Some work on a black list while others ignore important characters like “<” and “>”. ESAPI is one of the few which 
works on a whitelist and encodes all non-alphanumeric characters. It is important to use an encoding library that 
understands which characters can be used to exploit vulnerabilies in their respective contexts. Misconceptions 
abound related to the proper encoding that is required.
" - https://www.owasp.org/index.php/DOM_based_XSS_Prevention_Cheat_Sheet

I have no experience with any of them, so can't recommend any.


On Sun, Jul 7, 2013 at 8:51 PM, Robin Wood <robin () digininja org> wrote:
Can anyone suggest a JS XSS protection library?

Please don't preach they don't work its for a special project so even a bad one will do.

Robin


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