Microsoft Security Bulletin (MS00-082)
Patch Available for "Malformed MIME Header" Vulnerability
Originally posted: October 31, 2000
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Exchange Server 5.5. The vulnerability
could enable a malicious user to cause an Exchange server to fail.
Frequently asked questions regarding this vulnerability
and the patch can be found at
As part of its normal processing of incoming mails, Exchange server
checks for invalid values in the MIME header fields. However, if a
particular type of invalid value is present in certain fields, the
Exchange service will fail. Normal operations can be restored by
restarting the Exchange service and deleting the offending mail.
There is no capability via this vulnerability to add, delete or
modify emails, nor is there any capability to usurp administrative
privileges on the server. The vulnerability can be eliminated either
by apply the patch or Exchange 5.5 Service Pack 4, which is due to
be released shortly. Exchange 2000 is not affected by the
Affected Software Versions
- Microsoft Exchange Server 5.5
Note: Exchange Server 2000 is not affected by the vulnerability.
- Microsoft Exchange Server 5.5:
Note: This patch can be applied atop systems running Exchange Server
5.5 Service Pack 3. It is included in Exchange Server 5.5 Service
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 MS00-082,
- Microsoft Knowledge Base article Q275714 discusses this issue
and will be available soon.
- 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
Microsoft thanks Art Savelev (http://www.savelev.com) for reporting
this issue to us and working with us to protect customers.
- October 31, 2000: Bulletin Created.
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Last Updated October 31, 2000