The following is a Security Bulletin from the Microsoft Product Security
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Microsoft Security Bulletin (MS00-088)
Patch Available for "Exchange User Account" Vulnerability
Originally posted: November 16, 2000
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Exchange 2000 Server and Exchange 2000
Enterprise Server. This vulnerability could potentially allow an
unauthorized user to remotely login to an Exchange 2000 server and
possibly other servers on the affected computer's network.
Frequently asked questions regarding this vulnerability and the patch
can be found at
In early shipments of Exchange 2000, setup creates an account with a
known username and password. If a malicious user learned the username
and password, he or she could log onto the account. Under normal
circumstances, this account only has local user rights - it is not a
privileged account and cannot access Exchange 2000 data. However, if
Exchange 2000 were installed on a Domain Controller, the account
would also have Domain user privileges, and could thus gain access to
other resources in the affected Domain. Nevertheless, he would still
be restricted from accessing Exchange 2000 data.
To eliminate the security vulnerability, Microsoft has provided a
manual procedure, discussed in the FAQ, and a tool to protect our
customers. Microsoft also recommends that customers affected by this
vulnerability disable or delete this account after setup completes.
In addition, Exchange 2000 SP1 will contain a fix that removes this
Affected Software Versions
- Microsoft Exchange 2000 Server CDs without "Rev. A" stamped on the
CD on the line below the Part No.
- Microsoft Exchange 2000 Enterprise Server CDs without "Rev. A"
stamped on the CD below the Part No.
Note: This also applies to evaluation editions and to Microsoft
Exchange 2000 Server and Microsoft Exchange 2000 Enterprise Server
included on the October 2000 Select CDs.
- The Tool can be downloaded from:
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 MS00-088,
- Microsoft Knowledge Base (KB) article Q278523,
- 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
- November 16, 2000: Bulletin Created.
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED
"AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL
WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY
DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
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POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO
THE FOREGOING LIMITATION MAY NOT APPLY.
Last updated November 16, 2000
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