McAfee, Inc. McAfee Avert Labs Security Advisory Vendor Notification Date: 2006-07-06 Public Release Date: 2006-10-10
Microsoft Word Memmove Code Execution
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
Microsoft Word 2000 Microsoft Word 2002 Microsoft Word 2003 Microsoft Word 2004 for Mac Microsoft Word v. X for Mac
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.
Install the Microsoft-provided vendor patch.
This vulnerability was discovered by Chen Xiao Bo of McAfee Avert Labs.
For more information about the McAfee Avert Labs, visit our website at: http://www.mcafee.com/us/threat_center/default.asp
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.
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Dave Marcus, B.A., CCNA, MCSE Security Research and Communications Manager McAfee(r) Avert(r) Labs (443) 321-3771 Office (443) 668-0048 Mobile McAfee Threat Center <http://www.mcafee.com/us/threat_center/default.asp> McAfee Avert Labs Research Blog <http://www.avertlabs.com/research/blog>
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