full-disclosure - Re: Apache/PHP REQUEST

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Date: Tue, 24 Apr 2007 00:21:56 +0200
From: "Michał Majchrowicz" <mmajchrowicz@...il.com>
To: admin@...ibase.ca, full-disclosure@...ts.grok.org.uk
Subject: Re: Apache/PHP REQUEST_METHOD XSS Vulnerability

I agree. But (as a programmer) would you assume that there can be such
things in the REQUEST_METHOD? The flaw is that Apache accepts anything
after the valid request i.e. GET. There should be an error the the
request was not correct.
Regards Michal.

On 4/24/07, Kradorex Xeron <admin@...ibase.ca> wrote:
> This is a case of poor-programming, on the script coder's part, it is not so
> much a vunerability.
>
> That variable only contains what it is sent by apache. it doesn't parse it.
> nor is it supposed to. If you want to ensure there is no XSS going on, parse
> the variable, escape characters, etc as it IS user input.
>
> This CAN be a vulnerability with individual scripts, however, it is not a vuln
> with PHP or Apache.
>
> On Monday 23 April 2007 17:31, Michal Majchrowicz 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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