RE: Ilfak's WMF patch v. Microsoft's solution

["Richard M. Smith" <rms () computerbytesman com>]

Creating a email message with an IFRAME and a CID: .WMF file is easier said
than done. ;-)

Richard 

-----Original Message-----
From: Aviram Jenik [mailto:aviram () beyondsecurity com] 
Sent: Monday, January 02, 2006 8:51 AM
To: funsec () linuxbox org
Cc: Larry Seltzer; 'Richard M. Smith'
Subject: Re: [funsec] Ilfak's WMF patch v. Microsoft's solution

CID is only about the location of the image. AFAIK it was never about image
format.

When you write in an HTML code:

<IMG SRC="http://www.example.com/image.gif";> 

the image is pulled from the remote server. But when you write:
<IMG SRC="CID:image.gif"> 

Outlook/OE know to look for the image called "image.gif" in the attachments
in the current message. When you write an HTML message in outlook and add
images, the CID should be added automatically.

If you want to test this, take a vulnerable WMF and construct an HTML
message that has this image embedded. Then send it to yourself, and report
what happened. I don't have an Outlook anywhere near me or I'll do it
myself.

--
Aviram Jenik
CEO, Beyond Security
(703) 286-7725 x104

http://www.BeyondSecurity.com
http://www.SecuriTeam.com

On Monday, 2 January 2006 15:28, Larry Seltzer wrote:
> My refernce for a CID spec is for CID URLs, not the format of the target.
> Oops.
>
> Larry Seltzer
> eWEEK.com Security Center Editor
> http://security.eweek.com/
> http://blog.ziffdavis.com/seltzer
> Contributing Editor, PC Magazine
> larryseltzer () ziffdavis com
>
> -----Original Message-----
> From: funsec-bounces () linuxbox org [mailto:funsec-bounces () linuxbox org] 
> On Behalf Of Richard M. Smith
> Sent: Monday, January 02, 2006 8:19 AM
> To: funsec () linuxbox org
> Subject: RE: [funsec] Ilfak's WMF patch v. Microsoft's solution
>
> I wish I knew how to build an email message with IFRAME and the CID:
> protocol.  It don't feel conformtable assuming this trick wouldn't work.
>
> BTW, I discovered that there are different types of .WMF files.  
> Certain .WMF files are displayed by IE directly and do not fire up the 
> Windows Picture/FAX viewer when they are referenced by an IFRAME.
>
> Richard
>
> -----Original Message-----
> From: Larry Seltzer [mailto:larry () larryseltzer com]
> Sent: Monday, January 02, 2006 7:58 AM
> To: 'Richard M. Smith'; funsec () linuxbox org
> Subject: RE: [funsec] Ilfak's WMF patch v. Microsoft's solution
>
>
> You're also presuming that the format and implementations of CID: 
> support WMFs. The fact that we haven't seen one so far makes me wonder 
> if this is the case.
>
> I think the CID format is described here:
> http://www.rfc-editor.org/rfc/rfc2111.txt and there is more useful 
> info
> here: http://mailformat.dan.info/body/html.html
>
> Larry Seltzer
> eWEEK.com Security Center Editor
> http://security.eweek.com/
> http://blog.ziffdavis.com/seltzer
> Contributing Editor, PC Magazine
> larryseltzer () ziffdavis com
>
> -----Original Message-----
> From: funsec-bounces () linuxbox org [mailto:funsec-bounces () linuxbox org] 
> On Behalf Of Richard M. Smith
> Sent: Monday, January 02, 2006 7:27 AM
> To: funsec () linuxbox org
> Subject: RE: [funsec] Ilfak's WMF patch v. Microsoft's solution
>
> I believe that it is possible that all versions of Outlook and Outlook 
> Express will render an IFRAME in HTML email messages if the IFRAME 
> uses the
> CID: protocol to reference an attached file.  IFRAMEs will work in 
> this situation  regardless of security settings.  I know for example 
> that Outlook 2003 never blocks images loaded with the CID: protocol in 
> HTML email messages.
>
> If my theory is correct, then it should be possible to build a worm 
> that auto-executes simply by reading an HTML email message.  The worm 
> also would not require an external Web site to operate.
>
> I asked Microsoft about the IFRAME/CID: issue on Friday.  They haven't 
> said yet if this is a problem or not.  I don't have any good way to 
> test it myself.
>
> Richard
>
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>
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