[Full-disclosure] Apache Illegal Request Handling Possible XSS Vulnerability
admin at digibase.ca
Tue Apr 24 10:59:01 BST 2007
That would severely cut most extensibility and require further implementations
to be hardcoded, thus limiting apache's modular nature.
The original RFC would be insufficient for it's list as there are modules such
as webdav (as in the previous example) that add to that list of methods
Apache isn't just your basic run-of-the-mill "GET/POST" HTTPD, it is highly
extensible, sure, if it WAS a basic one, I could see limiting that list, but
it's quite advanced and modular in design.
On Tuesday 24 April 2007 05:18, Michal Majchrowicz wrote:
> 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
> Regards Michal.
> On 4/24/07, Richard Moore <rich at westpoint.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.
> > >
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