full-disclosure - Re: xss dot(.) filter evasion

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Message-Id: <64A4688E-5BED-47EA-AFCC-DAC3A7F2581A@gmail.com>
Date: Wed, 18 Jun 2008 19:07:02 -0700
From: Andrew Farmer <andfarm@...il.com>
To: Thomas Pollet <thomas.pollet@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: xss dot(.) filter evasion

On 18 Jun 08, at 08:49, Thomas Pollet wrote:
> I came across this site that implemented some filtering so the dots  
> were
> replaced by an underscore, also the quotes and backslash were escaped.
> I came up with the code below to bypass this filtering (write  
> anything to
> the page using String.fromCharCode)
> Someone knows a different way to do this?

eval makes everything easy. Well, reasonably easy.

eval(unescape(String(/%2a%2a%2falert(%22xss%22);%2f%2a%2a/)));

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