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McAfee, Inc.
McAfee Avert Labs Security Advisory
Vendor Notification Date: 2006-07-06
Public Release Date: 2006-10-10

Microsoft Word Memmove Code Execution

CVE-2006-3647
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•  Synopsis

An integer bug (stack overflow) exists in the Microsoft Word file format. The file
format allows a attacker to create a malicious Microsoft Word document that when
opened, will execute arbitrary code.

RISK FACTOR: CRITICAL
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•  Affected software

Microsoft Word 2000
Microsoft Word 2002
Microsoft Word 2003
Microsoft Word 2004 for Mac
Microsoft Word v. X for Mac
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•  Vulnerability Information

The specific flaw exists during the processing of a malicious WordDocument file.
The overflow can be triggered during the parsing at offset 0xb4c in the WordDocument
stream. At this offset, there is a WORD size that is used as the third parameter
to a memmove call. If the size passed to memmove is > 0x8000, it will extend to
DWORD(0x8000 = 0xffff8001), and will copy 0xffff8001 bytes to the stack.

This is a code execution vulnerability that may be exploited to compromise users that
open a malformed Microsoft Word document.

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•  Resolution

Install the Microsoft-provided vendor patch.

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•  Credits

This vulnerability was discovered by Chen Xiao Bo of McAfee Avert Labs.

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•  Contact Information

For more information about the McAfee Avert Labs, visit our website at:
http://www.mcafee.com/us/threat_center/default.asp

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•  Legal Notice

The information contained within this advisory is Copyright (C) 2006 McAfee, Inc.  It may be redistributed provided that no fee is charged for distribution and that the advisory is not modified in any way.

McAfee, Inc. and McAfee Avert Labs are registered Trademarks of McAfee, Inc. and/or its affiliated companies in the United States and/or other Countries.  All other registered and unregistered trademarks in this document are the sole property of their respective owners.

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