full-disclosure - Re: Adobe acrobat / Adobe Reader 6 can read local files

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From: jkuperus at planet.nl (Jelmer)
Subject: Re: Adobe acrobat / Adobe Reader 6 can read
 local files

The demo uses script behind the scenes to start the movie, So the demo would
fail if you disabled scripting

I don't believe there's a way to start the movie without with scripting
disabled. So you should be safe. But I'll admit to being anything but an
expert on pdf.. Yet anyway so I might me overlooking something

  --jelmer

-----Original Message-----
From: full-disclosure-admin@...ts.netsys.com
[mailto:full-disclosure-admin@...ts.netsys.com] On Behalf Of Jay Libove
Sent: dinsdag 12 oktober 2004 19:01
To: full-disclosure@...ts.netsys.com
Subject: [Full-Disclosure] Re: Adobe acrobat / Adobe Reader 6 can read local
files


I have Acrobat Reader configured to NOT run Javascript.  The demo did not
work on my system (XP, SP2, Acrobat Reader v6.0.2 dated 5/18/2004).

So, is having JavaScript enabled also a requirement in order for this
embedded SWF exploit to work?

-Jay Libove, CISSP

> Message: 20
> Date: Tue, 12 Oct 2004 15:56:32 +0200
> From: Jelmer <jkuperus@...net.nl>
> To: bugtraq@...urityfocus.com, full-disclosure@...ts.netsys.com
> Subject: [Full-Disclosure] Adobe acrobat / Adobe Reader 6 can read local
files
>
> Adobe acrobat / Adobe Reader 6 can read local files
>
> Description
>
> Acrobat/ Acrobat reader is software for viewing and printing Adobe
Portable
> Document Format (PDF) files. Adobe PDF files can be viewed on most major
> operating systems.
>
> Version 6 of this program has an issue with the way it handles embedding
> macromedia flash files directly into a pdf. This allows a malicious
website
> operator to steal local files from a user's hard drive including cookie
> files
>
> Technical Details:
>
> Version 6 of the pdf format introduced a new way to embed movies directly
> into the pdf file. In previous versions one could only link to media in
> external files
>
> Adobe reader extracts this swf file from the pdf and saves it under a
random
> name to your temp dir, on windows XP and 2000 this dir is usually located
at
>
> C:\Documents and Settings\<username>\Local Settings\Temp
>
> It then appears to "link" directly to this saved file in effect making
your
> local hard disk the codebase for this swf file and allowing it read access
> to all of the files on your hard drive
>
> Systems affected:
>
> Adobe reader 6
> Adobe acrobat 6
>
> Demonstration:
>
> Create a text file called c:\jelmer.txt then proceed to click on
>
> http://62.131.86.111/security/acrobat/demo.pdf
>
> Risk: medium

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