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Q184841: XWEB: OWA Component for IIS May Cause Heap Corruption

Article: Q184841
Product(s): Microsoft Exchange
Version(s): WINNT:5.5
Operating System(s): 
Keyword(s): kbusage
Last Modified: 22-JUN-2001

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The information in this article applies to:

- Microsoft Outlook Web Access, version 5.5 
- Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

When you try to access an Exchange Server version 5.5 computer using Outlook Web
Access (OWA), you may see some of the following symptoms:

- The Internet browser hangs.

- The Internet browser returns an ASP 0115 error.

- An Event ID of 5 is logged to the application event log on the Internet
  Information Server (IIS) computer. Note that the server is still available,
  but the ASP page for the Outlook Web Access (OWA) client is unresponsive.

NOTE: This problem may be seen in any environment. It may appear to be more
prevalent on servers that support more concurrent users, depending on server
memory configuration, but the problem is not dependent on server utilization or
the amount of memory allocated to the service.

CAUSE
=====

When the Deleted Items folder is emptied, a buffer is created that is too small
in some circumstances. This causes the end of the buffer to be overwritten by
data, causing corruption of the memory that follows.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Outlook Web Access
version 5.5. This problem has been corrected in the latest U.S. Service Pack for
Microsoft Exchange Server version 5.5. For information about obtaining the
Service Pack, query on the following word in the Microsoft Knowledge Base
(without the spaces):

  S E R V P A C K


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

A common problem in application development can be heap corruption. This
typically occurs when an application allocates a block of heap memory of a given
size and then writes to memory addresses beyond the requested size of the heap
block. Another common cause of heap corruption is writing to a block of memory
that has already been used.


Additional query words: exfclnfaq
======================================================================
Keywords          : kbusage 
Technology        : kbOutlookSearch kbOWASearch kbOWA550
Version           : WINNT:5.5
Issue type        : kbbug
Solution Type     : kbfix

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