full-disclosure - Re: Apache/PHP REQUEST

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Date: Tue, 24 Apr 2007 00:19:18 +0200
From: "Michal Majchrowicz" <m.majchrowicz@...il.com>
To: InSiStKool <insistkool@...il.com>, full-disclosure@...ts.grok.org.uk
Subject: Re: Apache/PHP REQUEST_METHOD XSS Vulnerability

Hi.
I am not a flash expert but you can find many interesting things about
flash and playing with http headers. For instance the case of Expect
XSS Vulnerability. I don't know any way to exploit but If I don't know
it doesn't mean there isn't one :)
Regards Michal.

On 4/24/07, InSiStKool <insistkool@...il.com> wrote:
> H Michael,
> This is interesting. I do able to see the output after injecting the xss
> statement, but I don't see how is possible to be used. Further,
> GET<script>alert(document.coookie);</script> /test.php HTTP/1.0
> I only know we can use nc or telnet to execute the above statement, how can
> you execute it with a browser like ff or ie?
>
> You mentioned "some flash might help", can you give me an example?
>
> Thanks
> insistkool
>
>
> On 4/23/07, Michal Majchrowicz <m.majchrowicz@...il.com> wrote:
> >
> > There exist a flaw in a way how Apache and php combination handle the
> > $_SERVER array.
> > If the programmer writes scrip like this:
> > <?php
> >               echo $_SERVER['REQUEST_METHOD'];
> > ?>
> > He will assume that REQUEST_METHOD can only by: GET,POST,OPTIONS,TRACE
> > and all that stuff. However this is not true, since Apache accepts
> > requests that look like this:
> > GET<script>alert(document.coookie);</script> /test.php HTTP/1.0
> > And the output for this would be:
> > GET<script>alert(document.coookie);</script>
> > Of course it is hard to exploit (I think some Flash might help ;)) and
> > I don't know if it is exploitable at all. But programmers should be
> > warned about this behaviour. You can't trust any  variable in the
> > $_SERVER table!
> > Regards Michal Majchrowicz.
> >
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