Microsoft KB Archive/196362

= XFOR: AV in ExchINS with Very Long MessageID =

Article ID: 196362

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q196362





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.

Keywords: kbbug kbfix KB196362

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