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

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Date: Thu, 19 Jun 2008 11:01:45 +0200
From: "Thomas Pollet" <thomas.pollet@...il.com>
To: "Andrew Farmer" <andfarm@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: xss dot(.) filter evasion

Hi,

2008/6/19 Andrew Farmer <andfarm@...il.com>:

> 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/)));
>

the problem was I couldn't call the String class method fromCharCode as it
would be called by String.fromCharCode, so just using eval didn't really
solve this.
Using with(String) i didn't need to call fromCharCode the way a class method
is normally called.
Thanks for replying though.

Regards,
Thomas Pollet

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