RE: Securing Printers

From: Corey Watts-Jones (
Date: 11/21/04

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    To: "'Herbold, John W.'" <>, "'sec-basic list'" <>
    Date: Sun, 21 Nov 2004 00:16:32 -0500

    When the file was dropped in via simple browser based FTP, it was write
    only. If I tried to copy it back out it would fail. I only briefly
    experimented with it but on the mid-level office printers it wasn't
    retrievable. I will experiment further on the Xerox Phaser and the Canon
    copier I have access to as well.



    -----Original Message-----
    From: Herbold, John W. []
    Sent: Friday, November 19, 2004 2:42 PM
    To: 'sec-basic list'
    Subject: RE: Securing Printers

    Can the printer cache be redirected or the information be copied out of the
    cache? This could give someone access to confidential information.


    John W. Herbold Jr.
    Security Specialist

    -----Original Message-----
    From: Corey Watts-Jones []
    Sent: Friday, November 19, 2004 9:50 AM
    To: 'Matthew Romanek'; 'sec-basic list'
    Subject: RE: Securing Printers

    I agree that for units of that size and production capability it's an issue,
    but after spending a few minutes playing with this on one of our local
    networks, most regular office printers (I tried it on a Lexmark T20 and an
    HP 4050) flush their buffers on a regular basis. This would render them
    pretty useless as storage for an exploit as I saw mentioned earlier on the
    list. On these printers, if I put a file in there that it couldn't
    interpret, it would spit out pages with random ASCII text on them and then
    go into error.

    When I ftp back into it, the info is gone.

    Corey Watts-Jones
    Compusmart Professional Services Technician

    -----Original Message-----
    From: Matthew Romanek []
    Sent: Tuesday, November 16, 2004 1:55 PM
    To: sec-basic list
    Subject: Re: Securing Printers

    Regarding Printers with public IPs, the very first thing that jumps to
    my mind is 'What do you consider a printer?'. I say that because quite
    a few of our printers are ImageRunners or that sort of networked
    copier. The kind with 80GB harddrives and convenient web interfaces
    that let you log in and pull up images of the last couple thousand
    pages that were printed on it, then save or re-print them.

    If that doesn't trigger alarms with data security, nothing will.

    Matthew 'Shandower' Romanek
    IDS Analyst

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