Bugtraq: Re: "Strip Script Tags" in FW-1 can be circumvented

[bbl () AVENIR NO (Bjørnar B. Larsen)]

Arne Vidstrøm wrote:
> The "Strip Script Tags" in FW-1 can be circumvented by adding 
> an extra <
> before the <SCRIPT> tag
(.......)

> I'm not able to check it on version 4.0 since 
> I don't have access to it.
I've tried this on FW-1 version 4.0 SP4, on NT4 and it strips the code as
it's supposed to do. That is, 
<<SCRIPT LANGUAGE="JavaScript">
is altered into
<<SCRIP! LANGUAGE="JavaScript">
which the browsers will disregard. It's a bit silly that the alert("hello
world") isn't cut away, though, so "< alert("hello world") test" is what
your page looks like in web-browsers.

Regards,

:) Bjørnar