There is a buffer overrun in Winhelp32.exe. A malicious user can exploit this buffer overrun to run code in the user's security context. This permits the malicious user to perform any actions that a legitimate user can perform. A malicious user can exploit this vulnerability by using a malicious Web page or by using an HTML-based e-mail message.
By default, the HTML exploit is blocked if you are using Microsoft Outlook Express 6 or Microsoft Outlook 2002, or if you installed the Outlook E-mail Security Update
in Microsoft Outlook 98 or Microsoft Outlook 2000.
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the
Microsoft Knowledge Base:
How to Obtain the Latest Windows 2000 Service Pack
Microsoft has confirmed that this is a problem in Microsoft Windows 2000. This problem was first corrected in Windows 2000 Service Pack 3.
Microsoft thanks Mark Litchfield of Next Generation Security Software Ltd.
for reporting this issue.