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 http://www.microsoft.com/technet/security/bulletin/fq00-082.asp
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 vulnerability.
Note: Exchange Server 2000 is not affected by the vulnerability.
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 Pack 4.
Note: Additional security patches are available at the Microsoft Download Center
Please see the following references for more information related to this issue. - Frequently Asked Questions: Microsoft Security Bulletin MS00-082, http://www.microsoft.com/technet/security/bulletin/fq00-082.asp - Microsoft Knowledge Base article Q275714 discusses this issue and will be available soon. - Microsoft TechNet Security web site, http://www.microsoft.com/technet/security/default.asp
This is a fully supported patch. Information on contacting Microsoft Product Support Services is available at http://support.microsoft.com/support/contact/default.asp.
Microsoft thanks Art Savelev (http://www.savelev.com) for reporting this issue to us and working with us to protect customers.
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Last Updated October 31, 2000