Microsoft KB Archive/294977

= XADM: RPC Denial of Service Attack May Cause Information Store to Stop Unexpectedly =

Article ID: 294977

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition
 * Microsoft Exchange Server 5.5 Service Pack 1
 * Microsoft Exchange Server 5.5 Service Pack 2
 * Microsoft Exchange Server 5.5 Service Pack 3
 * Microsoft Exchange Server 5.5 Service Pack 4

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This article was previously published under Q294977





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 hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Exchange Server 5.5 service pack that contains this hotfix.

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, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical 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

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):

Download Q304062engi386.exe now

French:

Download Q304062frni386.exe now

German:

Download Q304062geri386.exe now

Japanese:

Download 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 following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to 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:

304062 XGEN: Exchange Server 5.5 Post-SP4 RPC Fixes



STATUS
Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5.

Keywords: kbhotfixserver kbqfe kbbug kbexchange550presp5fix kbfix kbqfe KB294977

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