DOCUMENT:Q294977  08-MAY-2002  [exchange]
TITLE   :XADM: RPC Denial of Service Attack Stops Information Store
PRODUCT :Microsoft Exchange
PROD/VER::5.5,5.5 SP1,5.5 SP2,5.5 SP3,5.5 SP4
OPER/SYS:
KEYWORDS:kbExchange550preSP5fix

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The information in this article applies to:

 - Microsoft Exchange Server, versions 5.5, 5.5 SP1, 5.5 SP2, 5.5 SP3, 5.5 SP4 
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SYMPTOMS
========

The Exchange Server 5.5 information store may stop unexpectedly while under a
remote procedure call (RPC) denial of service attack. A call stack that is
similar to the following may be logged in the Drwtsn32.log:

   

   FramePtr RetAddr Param1 Param2 Param3 Function Name
   04eef9b4 77cf3081 00178910 02960296 00000001 ESEBACK!HrRBackupEnd+0x27
   04eef9cc 77d62aba 6fd12730 04eefa1c 00000001 0x77cf3081
   04eefcd0 77d62dc6 00000000 00000000 0017da28 0x77d62aba
   04eefce8 77cf2735 00000001 0016a370 0017da28 0x77d62dc6
   04eefd1c 77cf26a2 6fd15046 0017da28 04eefdfc 0x77cf2735

RESOLUTION
==========

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems experiencing this specific problem. This fix may receive additional
testing at a later time, to further ensure product quality. Therefore, if you
are not severely affected by this problem, Microsoft recommends that you wait
for the next Microsoft Exchange Server 5.5 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services
to obtain the fix. For a complete list of Microsoft Product Support Services
phone numbers and information about support costs, please go to the following
address on the World Wide Web:

   http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.

The English version of this fix should have the following file attributes or
later:

Component: JET

+---------------------------+
| File name   | Version     | 
+---------------------------+
| Eseback.dll | 5.5.2654.51 | 
+---------------------------+

NOTE: Because of file dependencies, this fix requires Microsoft Exchange Server
version 5.5 Service Pack 4.

The following files are available for download from the Microsoft Download
Center:

   English (US):
   DownloadDownload Q304062engi386.exe now

   French:
   DownloadDownload Q304062frni386.exe now

   German:
   DownloadDownload Q304062geri386.exe now

   Japanese:
   DownloadDownload Q304062jpni386.exe now

These files contain the following files:

   

   Dbserver.sch 
   Dcprods.cat 
   Dsamain.exe 
   Ems_rid.dll 
   Emsmta.exe 
   Eseback.dll 
   Infoplog.cfg 
   Mad.exe 
   Mtacheck.exe 
   Mtamsg.dll 
   Mtaperf.dll 
   P2.xv2 
   P42.tpl 
   P772.tpl 
   Store.exe 
   X400om.dll

Release Date: July 24, 2001

For additional information about how to download Microsoft Support files, click
the article number below to view the article in the Microsoft Knowledge Base:

   Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft used the most current virus detection software available on the date of
posting to scan this file for viruses. After it is posted, the file is housed on
secure servers that prevent any unauthorized changes to the file.

For additional information about the fixes that are included in this package,
click the article number below to view the article in the Microsoft Knowledge
Base:

   Q304062 XGEN: Exchange Server 5.5 Post-SP4 RPC Fixes



STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5.

Additional query words:

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Keywords          : kbExchange550preSP5fix 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2 kbExchange550SP1 kbExchange550SP2 kbExchange550SP3 kbExchange550SP4
Version           : :5.5,5.5 SP1,5.5 SP2,5.5 SP3,5.5 SP4
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 2002.