full-disclosure - Re: Vulnerability discloses PIN used in Microsoft Excel secure printing

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Date: Mon, 31 Jan 2011 16:46:26 +0100
From: Christian Sciberras <uuf6429@...il.com>
To: "Thor (Hammer of God)" <thor@...merofgod.com>
Cc: "full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk>
Subject: Re: Vulnerability discloses PIN used in Microsoft
 Excel secure printing

Thor, how about creating a fake copy of the office with a fake printer? The
attacker gets as much original/restricted copies as he wants to!(!)



On Mon, Jan 31, 2011 at 4:36 PM, Thor (Hammer of God)
<thor@...merofgod.com>wrote:

> Yes, it comes in very handy for those who need to ensure that the documents
> they placed on open shares be held at the printer for security.
>
> I love this part: "The adversary can then either print two copies of the
> victim's file and leave
> one on the printer for the victim, or print one copy of the victim's file
> and photocopy it before
> leaving the original on the printer for the victim, or print one copy of
> the victim's file and take it
> resulting in the victim thinking that perhaps they didn't click the print
> icon after all."
>
> They forgot to add "Or, the attacker could open the spreadsheet from the
> share."  LOL
>
> t
>
> From: full-disclosure-bounces@...ts.grok.org.uk [mailto:
> full-disclosure-bounces@...ts.grok.org.uk] On Behalf Of Cal Leeming
> [Simplicity Media Ltd]
> Sent: Monday, January 31, 2011 6:19 AM
> To: Ed Murphy
> Cc: full-disclosure@...ts.grok.org.uk
> Subject: Re: [Full-disclosure] Vulnerability discloses PIN used in
> Microsoft Excel secure printing
>
> Wtf, I've never heard heard of a 'secure' print :S
>
> On Mon, Jan 31, 2011 at 8:01 AM, Ed Murphy <ed.b.murphy@...il.com> wrote:
> Hello list,
>
> Stumbled across this today.  It appears Excel spreadsheets store
> printer information including the PIN you might use when trying to do
> a "secure" print.
>
>
> http://insecureprinting.com/Microsoft_Excel_Spreadsheets_Expose_User_PIN_Used_for_Confidential_Secure_Printing.pdf
>
> The paper is quite thorough and shows that in most cases the PIN is
> stored in clear text in the spreadsheet, though some printer vendors
> try to obfuscate the PIN (though not very successfully).
>
> Thanks,
> Ed
>
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