On November 06, 2000, Microsoft released the original version of this
bulletin, announcing the availability of a patch that eliminates a
security vulnerability in Microsoft(r) Internet Information Services
5.0. The vulnerability could enable a malicious user to run
operating system commands on a web server. On November 10, 2000, we
updated the bulletin to clarify the scope of the issue. On November
21, 2000, we updated it again, to discuss two newly-discovered
variants of the original vulnerability.

The new variants don´t change the effect of exploiting the
vulnerability. However, they do affect a larger number of products.
The original variant affected IIS 5.0 in all cases, but only affected
IIS 4.0 when a service pack prior to Windows NT 4.0 Service Pack 6a
was in use. The new variants affect both IIS 4.0 and IIS 5.0
regardless of the service pack is in use. Microsoft recommends that
all affected customers apply the new versions of the patches.

Frequently asked questions regarding this vulnerability
and the patch can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-086.asp

Affected Software Versions
==========================
- Microsoft Internet Information Server 4.0
- Microsoft Internet Information Services 5.0

Patch Availability
==================
- Internet Information Server 4.0:
http://www.microsoft.com/ntserver/nts/downloads/critical/q277873
- Internet Information Services 5.0:
http://www.microsoft.com/Windows2000/downloads/critical/q277873

Note: The IIS 5.0 patch can be applied atop systems running either
Windows 2000 Gold or Service Pack 1. It will be included in Windows
2000 Service Pack 2.

Note: The IIS 4.0 patch can be applied atop systems running Windows
NT 4.0 Service Pack 6a. It will be included in Windows NT 4.0
Service Pack 7.