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Q196362: XFOR: AV in ExchINS with Very Long MessageID

Article: Q196362
Product(s): Microsoft Exchange
Version(s): WinNT:5.5
Operating System(s): 
Keyword(s): kbfixlist
Last Modified: 20-MAY-2002

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The information in this article applies to:

- Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

ExchINS (Exchange NNTP) will cause an access violation error while attempting to
send an IHAVE message with an excessively long MessageID.

The debug stack is as follows:

Access Violation c0000005 in ExchINS
> kv
026efd54  00414b45  EXCHINS!CNNTPPost::SendIHave+0x128 (FPO: [ebp 00057e40]
[1,1,4])
026efd8c  00409355  EXCHINS!CNNTPOutboundStreamServer::HrGetStream+0xb5
(FPO: [ebp 00bf05c0] [2,8,4])
026efdc8  6f787b54  EXCHINS!CCollector::ImportMessageChangeAsAStream+0xd5
(FPO: [5,10,2])
026efe18  6f786321  EMSMDB32!IXMSGSYNC::EcUpdateCollector+0x174 (FPO: [ebp
02991474] [4,10,4])
026efe38  6f773300  EMSMDB32!IXMSGFXRCV::EcRcv+0x151 (FPO: [1,0,3])
026efe48  6f7784c9  EMSMDB32!FXRCVCTX::EcRcv+0x10 (FPO: [1,0,2])
026efe58  6f78715e  EMSMDB32!FXRCVMGR::EcDoClient+0x39 (FPO: [2,0,2])
026efe88  6f7880a5  EMSMDB32!IXCHGSYNC::EcSynchronize+0x5e (FPO: [ebp
77f674e0] [3,5,4])
026efea4  00408a71  EMSMDB32!IXMSGSYNC::Synchronize+0x25 (FPO: [3,0,2])
026effb8  77f04f2c  EXCHINS!HrGetOutboundThread+0x2c1 (FPO: [ebp 77f64b1c]
[1,61,4])
77f64b1c  0cc25de5  KERNEL32!BaseThreadStart+0x51(UKNOWN FPO TYPE)

CAUSE
=====

This is because of ExchINS not comparing the length of the MessageID with the
amount of available buffer space.

RESOLUTION
==========

A supported fix that corrects this problem is now available from Microsoft, but
has not been fully regression tested and should be applied only to systems
experiencing this specific problem. If you are not severely affected by this
specific problem, Microsoft recommends that you wait for the next Microsoft
Exchange Server version 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 on support costs, please go to the following
address on the World Wide Web:

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

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

  Component: NNTP

  File Name     Version
  -------------------------
  Exchins.dll   5.5.2399.0


STATUS
======

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

MORE INFORMATION
================

The updated component limits MessageIDs to 256 characters, and will discard
messages with IDs longer than this.

Additional query words:

======================================================================
Keywords          :  kbfixlist
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : WinNT:5.5
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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

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