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@Stake Advisory: Microsoft Office 2000 ClipArt Vulnerablity
From: weld () L0PHT COM (Weld Pond)
Date: Tue, 7 Mar 2000 09:10:03 -0500


Moderator, please change from address to dildog () l0pht com if possible.

-weld

                              @Stake Inc.
                         L0pht Research Labs
                   www.atstake.com     www.L0pht.com

                           Security Advisory

        Advisory Name: ClipArt Gallery Overflow
    Advisory Released: 03/06/00
          Application: Microsoft Office 2000
             Severity: An attacker can seize control of a Windows 95, 98,NT,
                       or 2000 machine via any HTML source, including
                       Microsoft Outlook e-mail.
               Status: Vendor patch available, workaround available
               Author: dildog () l0pht com
                  WWW: http://www.l0pht.com/advisories.html

Overview:

        ClipArt Gallery (CAG.EXE) that comes with Microsoft Office 2000
processes ".CIL" files for installation of clipart from the Internet. The
CIL format is not handled properly by CAG.EXE and one of the internal
fields in the file presents a buffer overflow condition, allowing
arbitrary code to be executed by an attacker. The attacker would place a
malicious CIL file on a website, or in an email, causing the target to
import the CIL file. The file will be opened without prompting as the CIL
file format does not require confirmation for open after download. This
issue requires NO active scripting to exploit, and is NOT regulated by
Internet Explorer 'security zones'.

Description:

        The ".CIL" file format is a compressed clip-art delivery format
that takes a Windows Metafile (WMF) or other image, stores it compressed,
and packages it with keywords and descriptive information. Amongst the
various fields in the CIL format are a few Unicode strings, one of which
is the filename to which the clipart is to be decompressed. If the
filename specified is extremely long, a stack overflow occurs after a
Unicode to ANSI conversion, copying the ANSI version of the buffer over
the stack frame.

        Unfortunately, the current fix for this issue is really only a
bandaid to the problem that Internet Explorer is used -for everything-
nowadays and that its HTML parser allows random file formats to be
downloaded and parsed without confirmation in a number of cases. One can
expect to see similar issues to this in the future.

Vendor provided fix:

        Get your patch here:

      http://www.microsoft.com/technet/security/bulletin/ms00-015.asp

Quick solution:

        One may wish to go through all of the file type associations and
turn on the 'Confirm Open After Download' checkbox to ensure that suspect
file types are not automatically executed without user intervention.

        To do this in Windows 2000, open up a standard Explorer window
(such as My Computer), and go to the Tools menu and choose "Folder
Options". Under the "File Types" tab, go to the "CIL" file type and click
on it. Now press the "Advanced" button. You will notice that the checkbox
"Confirm Open After Download" is unchecked. Check it, and then click OK.

Exploit:

        This CIL file will create a harmless registry key when opened. The
registry key location is:

        HKLM\Software\Microsoft\Windows:dword,SMACK!=0x00000001

This is proof of concept code only, but theoretically could be any
executable code desired. This code works only on Windows 2000, but
shifting around a few offsets yields code that works under Windows NT 4.0
and Win9X.

<--- cut here --->

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M9@"!`# () ``P`#`'4`] () !?`)``D`#_`#8`60!6`%<`N`#]`/\`_P!_`/<`T`!0
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M9 () !F`&8`9 () ```&8`9 () !F`&8`9 () !F`&8```!F`&8`9 () !F`&8`9 () !F`&8`9 () !F
)`&8`9 () ``````
`
end

<--- cut here --->

dildog () l0pht com

  [ For more advisories check out http://www.l0pht.com/advisories.html ]
                                         L-ZERO-P-H-T


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