full-disclosure - Re: Backdooring PDF Files

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Date: Thu, 14 Sep 2006 00:02:51 +0300 (EEST)
From: Juha-Matti Laurio <juha-matti.laurio@...ti.fi>
To: David Kierznowski <david.kierznowski@...il.com>
Cc: full-disclosure@...ts.grok.org.uk, security-basics@...urityfocus.com,
	"pdp \(architect\)" <pdp.gnucitizen@...glemail.com>
Subject: Re: Backdooring PDF Files

Yes, the first example opens MSIE without any user interaction when visiting your PoC link with Firefox 1.5.0.6.
This issue is more serious due to recent unpatched issues and public exploits in IE.

- Juha-Matti


David Kierznowski <david.kierznowski@...il.com> wrote: 
> 
> I installed 7.0.8 (latest version) for testing.
> 
> If the document is loaded from the browser you receive no warning.
> v7.0.8 seems to warn the user if the document is loaded from the
> desktop.
> 
> I think this has to do with different Adobe contexts.
> 
> --
> David Kierznowski
> 
> On 13/09/06, pdp (architect) <pdp.gnucitizen@...glemail.com> wrote:
> > I have tested both of the examples and no warning boxes are showing.
> > It seams that everybody is getting different results. Interesting!
> >
> > On 9/13/06, Juha-Matti Laurio <juha-matti.laurio@...ti.fi> wrote:
> > > Proof of Concept for example 1 (backdoored1.pdf) opened with Adobe Reader 7.0.8
> > > (i.e. no browser plug-in used) issued a Security Warning dialog box:
> > >
> > > "The document is trying to conenct to the site:
> > > http://www.google.com/owned.html
> > >
> > > If you trust the site click "Allow", otherwise click "Block"."
> > >
> > > Option Remember my action is in use as well.
> > >
> > > When clicking "Allow" this Google page was opened in MSIE (in fact FF is my default browser, however).
> > >
> > > Am I missing something related to differences between Reader plug-in and Reader application?
> > >
> > > - Juha-Matti
> > >
> > >
> > > David Kierznowski <david.kierznowski@...il.com> wrote:
> > > >
> > > > Recently, there has been alot of hype involving backdooring various
> > > > web technologies. pdp (arcitect) has done alot of work centered around
> > > > this area.
> > > >
> > > > I saw Jeremiah Grossman mention PDF's being "BAD", however, I was
> > > > unable to easily locate any practical reasons as to why. I decided to
> > > > investigate this a little further.
> > > >
> > > > This article discusses two possible backdoor techniques for Adobe
> > > > Acrabat Reader and Professional. It includes proof of concept code and
> > > > backdoored PDF documents.
> > > >
> > > > The article can be found here:
> > > > http://michaeldaw.org/
> > > >
> >
> >
> > --
> > pdp (architect)
> > http://www.gnucitizen.org

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