Re: Bypassing of web filters by using ASCII
On 23 Jun 2006 at 10:35, Vincent Archer wrote:
> On Fri, Jun 23, 2006 at 12:08:56AM +0200, Amit Klein (AKsecurity) wrote:
> > So what I don't understand now is why IE's "solution" is any better than
> > Opera/Firefox?
> >
> > Why is modifying the data (msb) any better than modifying the
> > data-description (charset)?
>
> The same problem did exist in RFC821, which specified the data path as
> being 7-bit, with the MSB set to 0. The venerable ancestor sendmail did
> enforce that, by and-ing each and every byte with 0x7F, which means that
> the IE solution is "slightly better", due to historical precedent.
>
If we're into precedences, does anyone know what Mosaic 1.0 used to do in such
case? after
all, it was probably the first widely used browser (see
http://www.livinginternet.com/w/wi_browse.htm), and it made some sense (in the
early 90s)
to conform to its de-facto browser standard.
> Not that it's good anyway.
>
Yep...
-Amit