bugtraq - Re: Php Nuke POST XSS on steroids

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Date: Tue, 13 Mar 2007 17:59:37 -0400
From: Paul Laudanski <paul@...tlecops.com>
To: ascii <info@...t.uz>
Cc: full-disclosure@...ts.grok.org.uk, news@...uriteam.com,
	vulnwatch@...nwatch.org, bugtraq@...urityfocus.com,
	vuln@...urity.nnov.ru, webappsec@...ts.owasp.org,
	Stefano Di Paola <stefano.dipaola@...ec.it>
Subject: Re: Php Nuke POST XSS on steroids

ascii wrote:
> Paul Laudanski wrote:
>   
>> I tried both your scripts at a few locations, and all I get back is this
>>     
> [cut]
>
> hi Paul, long time from ccc : )
>   
Hey sure how are you?  Been well?  I've been really busy with CC.
> it happens because http headers must be on a single line, it's a
> formatting issue (my fault, i used to put a link to a plain text
> version but this time i forgot about it), i've just created a txt
> version of the advisory available here:
>
> http://phpfi.com/214668
>   
Thank you, this works.
> it should be more usable, i dunno when the demos will stop working
> on phpnuke.org so i've asked wisec to upload this video since www.ush.it
> has bandwidth issues
>
> http://www.wisec.it/ush/phpnukexss.html
>
> obviously to bypass the anti-CSRF filter you have to mix the XSS with
> the import_request_variables() trick (this doesn't work on phpnuke.org
> because they have globals on, this is why i choose that domain)
>
> consider that import_request_variables() will allows you to do much
> more than an XSS, this is just an example advisory on an example product
>
>   
I'd be curious to see your POC using the import_request_variables, 
because at the moment:

<br><center><a href="modules.php?name=Downloads"><img 
src="modules/Downloads/images/down-logo.gif" border="0" alt=""></a><br><br>
d4
<form 
action="modules.php?name=Downloads&amp;d_op=search&amp;query=token<>token

" method="post"><font class="content"><input type="text" size="25" 
name="query"> <input type="submit" value="Search"></font></form>
18
<font class="content">[

I'm not sure how this will have any effect as you must POST the data.  
In that sense, you can't exactly exploit a web user -- which is what you 
basically said with a gateway page.  In a sense, you are setting up a 
sort of 'phish' against the site itself. 

For years we've been seeing to disable register_globals, and your 
workaround to enable it imvho is not a workaround at all.  That 
shouldn't even be suggested.

In closing, can you supply an import_request_variables POC?

Thanks as always,
Paul Laudanski
http://www.linkedin.com/pub/1/49a/17b