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Microsoft Security Bulletin (MS99-001)
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Patch Available for exposure in Forms 2.0 TextBox
Control that allows data to be read from user's Clipboard
Originally Posted: January 21, 1999
Summary
=======
Microsoft has released a patch that fixes a vulnerability in the Forms 2.0
ActiveX control. This control is distributed in any application that
includes Visual Basic for Applications 5.0. A malicious hacker could use the
Forms 2.0 Control to read or export text on a user's Clipboard when that
user visits a web site set up by the malicious hacker or opens a HTML email
created by the malicious hacker.
A fully supported patch is available to fix this vulnerability, and
Microsoft recommends that customers download and install it to protect their
computers.
Issue
=====
The Forms 2.0 ActiveX control has a vulnerability that allows text to be
pasted from a user's Clipboard into a Forms 2.0 Text Box or Combo Box. This
control is installed as a standard part of the applications listed in the
"Affected Products" section below.
A malicious hacker could use the Forms 2.0 Control to read or export text on
a user's Clipboard when that user visits a web site set up by the malicious
hacker or opens a HTML email created by the malicious hacker.
The Forms 2.0 Security Patch prevents a hacker from exploiting this
vulnerability. Those who install the patch will not lose functionality and
will still have the ability to manually paste content from their Clipboard
to a Forms 2.0 Text Box or Combo Box. Developers who have built VBA
solutions using the Forms 2.0 Control will still be able to paste into Text
Boxes and Combo Boxes.
While there have not been any reports of customers being adversely affected
by these problems, Microsoft is releasing a patch to address any risks posed
by this issue.
Affected Software Versions
==========================
The following software installs the Forms 2.0 control:
- Microsoft Office 97
- Microsot Outlook 98
- Microsoft Project 98
- Microsoft Visual Basic 5.0
- Any third-party product that includes Visual
Basic for Applications 5.0
To determine whether you need to download and install the security fix,
right-click the Fm20.dll file in your \Windows\System folder and choose
Properties on the shortcut menu. If the file date of your FM20.dll file is
earlier than January 11, 1999 (1/11/99), you should download and install the
security fix.
What Microsoft is Doing
=======================
Microsoft has released a patch that fixes the problem identified. This patch
is available for download from the sites listed below in "What Customers
Should Do".
Microsoft has made information about this patch available on the Microsoft
Office web site, and has sent information about the availability of this
patch to ISV partners licensing VBA and registered Office users.
Microsoft has sent this security bulletin to customers subscribing to the
Microsoft Product Security Notification Service. See "Signing up for the
Microsoft Product Security Notification Service"
(http://www.microsoft.com/security/services/bulletin.asp) for more
information about this free customer service.
Microsoft has published the following Knowledge Base (KB) article on this
issue:
- Microsoft Knowledge Base (KB) article Q214757,
"Forms 2.0 (Fm20*.dll) ActiveX Control Security Fix",
http://support.microsoft.com/support/kb/articles/q214/7/57.asp
(Note: It might take 24 hours from the original posting of this bulletin for
the KB article to be visible in the Web-based Knowledge Base.)
What customers should do
========================
Microsoft highly recommends that all affected customers download the patch
to protect their computers. The complete URL for each affected software
version is given below.
Customers can obtain the patch from the free Office Update service. To
obtain this patch using Office Update, visit the Office Update site at
http://officeupdate.microsoft.com/downloaddetails/fm2paste.htm.
More Information
================
Please see the following references for more information related to this
issue.
- Patch Available for exposure in Forms 2.0 TextBox
Control that allows data to be read from user's Clipboard
(the Web-posted version of this bulletin),
http://www.microsoft.com/security/bulletins/ms99-001.asp
- Microsoft Knowledge Base (KB) article Q214757,
"Forms 2.0 (Fm20*.dll) ActiveX Control Security Fix",
http://support.microsoft.com/support/kb/articles/q214/7/57.asp
Acknowledgements
================
Microsoft wishes to acknowledge Juan Carlos Garcia Cuartango of Spain for
discovering this vulnerability and for his continued assistance and input.
Obtaining Support on this Issue
===============================
This is a supported patch. If you have problems installing this patch or
require technical assistance with this patch, please contact Microsoft
Technical Support. For information on contacting Microsoft Technical
Support, please see
http://support.microsoft.com/support/contact/default.asp.
Revisions
=========
- January 21, 1999: Bulletin Created
For additional security-related information about Microsoft products, please
visit http://www.microsoft.com/security
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