Microsoft Security Bulletin (MS00-051)
Patch Available for "Excel REGISTER.ID Function" Vulnerability
Originally posted: July 26, 2000
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Microsoft Excel 97 and Excel 2000. The
vulnerability could allow a malicious user to run code from an Excel
worksheet without the user's knowledge.
Frequently asked questions regarding this vulnerability and the patch
can be found at:
A vulnerability has been discovered in REGISTER.ID, a worksheet
function, when referencing a DLL created by a malicious user. When
REGISTER.ID is invoked from an Excel worksheet it can reference any
DLL on the system and can be harmful if the referenced DLL contains
malicious code. By design, there is no warning given to the user when
REGISTER.ID calls a DLL, from a worksheet.
In order for a malicious user to exploit this vulnerability the
referenced (malicious) DLL would have to reside on the affected
user's computer or on a machine accessible via a UNC path on the
Affected Software Versions
Microsoft Excel 97 or Excel 2000, which ship as part of the Office
suite or as stand-alone products.
- Microsoft Excel 2000:
- Microsoft Excel 97:
Note Additional security patches are available at the Microsoft
Please see the following references for more information related to
- Frequently Asked Questions: Microsoft Security Bulletin MS00-051,
- Microsoft Knowledge Base (KB) articles, (available soon)
Q269252 (Excel 2000) and Q269263 (Excel 97) discusses this
issue in more detail.
- Microsoft TechNet Security web site,
Obtaining Support on this Issue
This is a fully supported patch. Information on contacting Microsoft
Product Support Services is available at
- July 26, 2000: Bulletin Created.
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Last Updated July 26, 2000