bugtraq - MS Word Unchecked Boundary Condition Vulnerability

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Date: Mon, 10 Jul 2006 20:47:21 +0500
From: naveed <naveedafzal@...il.com>
To: bugtraq@...urityfocus.com
Subject: MS Word Unchecked Boundary Condition Vulnerability

/*------------------------------------------------------------
 *    Microsoft Word unchecked boundary condition vulnerability.
 *  ---------------------------------------------------------
 *    One of the functions in mso.dll (older versions mso9.dll)
 *    cannot properly handle the specially crafted files causing
 *    invalid memory acess and in some cases arbitrary overwrites.
 *    The exported function LsCreateLine (entry : mso_203) contains a boundary
 *    error while parsing certain specially crafted .DOC files,resulting in
 *    an invalid memory access.
 *
 *    Following proof of concept code generates a .doc file , opening
 *    the file will cause an access violation, in mso.dll.
 *    Code execution is possible if 4-bytes of arbitrary memory
 *    is overwritten. Apparently this is not specific to MS Word
 *    only but other Office products are also vulnerable which use these
 *    functions. No other user interaction required in order to
trigger the vulnerability.
 *
 *    Affected Products: Microsoft Office
 *    Tested against : Microsoft Word 2003,2002,2000
 *
 *    // naveed afzal
 *------------------------------------------------------------*/

A proof of concept code is available here

http://www.bsdpakistan.org/downloads/wordPOC.c