Re: xss dot(.) filter evasion

["Thomas Pollet" <thomas.pollet () gmail com>]

Hi,

2008/6/19 Andrew Farmer <andfarm () gmail 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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