full-disclosure - Re: Apache Illegal Request Handling Possible XSS Vulnerability

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Message-ID: <3d3168e50704240229ka2c3dbco97657292de7755a0@mail.gmail.com>
Date: Tue, 24 Apr 2007 11:29:53 +0200
From: "Michal Majchrowicz" <m.majchrowicz@...il.com>
To: "Richard Moore" <rich@...tpoint.ltd.uk>, full-disclosure@...ts.grok.org.uk
Subject: Re: Apache Illegal Request Handling Possible XSS
	Vulnerability

Okay so let's assume that there cany "anything" as the request. But
there has to be something that handles this request? If there is no
"handler" for request "<script>" Apache should return error page. And
what about protocol version? You didn't answer this question.
Regards Michal.

On 4/24/07, Richard Moore <rich@...tpoint.ltd.uk> wrote:
> Michal Majchrowicz wrote:
> > Hi.
> > I think that server should have a list of valid requests. In fact
> > Apache warns you sometimes that valid requests are:
> > "GET/POST/TRACE/OPTIONS". The solution that it just accepts everything
> > as request and protocol makes no sense. What kind of protocol is
>
> It makes lots of sense as I said - protocols like WebDAV are
> layered on top of HTTP and are implemented in apache using the
> exact same API as PHP uses. They need to add methods like PROPFIND
> etc. Unless they are required to define the exact set of verbs
> supported by every page then there's no way to define a fixed
> list.
>
> I do however agree that it could be restricted to something like
> [A-Z0-9]+ as I said.
>
> Cheers
>
> Rich.
>
> > "<script>"?
> > Regards Michal.
> >
> > On 4/24/07, Richard Moore <rich@...tpoint.ltd.uk> wrote:
> >> Michal Majchrowicz wrote:
> >> > Hi.
> >> > I think now we can classify this as flaw in Apache. It accepts
> >> > requests that simply make no sense. Take a look at this example:
> >> > <script>alert(document.cookie);</script> /test.php
> >> > <script>alert(document.cookie);</script>
> >> > In some circumstances it may cause XSS vulnerability:
> >> > <?php
> >> >         echo $_SERVER['REQUEST_METHOD'];
> >> >         echo $_SERVER['SERVER_PROTOCOL'];
> >> > ?>
> >>
> >> As Kradorex Xeron said, that's a flaw in the script. Apache needs
> >> to let arbitrary verbs through to the PHP (or other server extension)
> >> otherwise tools like webdav that require additional verbs could not
> >> be implemented. It is possibly arguable that it should restrict the
> >> verbs to a single alphanumeric string, but it certainly can't be
> >> counted on to be just GET/POST etc.
> >>
> >> Cheers
> >>
> >> Rich.
> >>
> >> > I am now investigating other possible attacks.
> >> > Regards Michal Majchrowicz.
> >> >
> >> > _______________________________________________
> >> > Full-Disclosure - We believe in it.
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> >> >
> >>
> >>
> >> --
> >> Richard Moore, Principal Software Engineer,
> >> Westpoint Ltd,
> >> Albion Wharf, 19 Albion Street, Manchester, M1 5LN, England
> >> Tel: +44 161 237 1028
> >> Fax: +44 161 237 1031
> >>
> >
> >
>
>
> --
> Richard Moore, Principal Software Engineer,
> Westpoint Ltd,
> Albion Wharf, 19 Albion Street, Manchester, M1 5LN, England
> Tel: +44 161 237 1028
> Fax: +44 161 237 1031
>

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