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SYMSA-2006-007: Microsoft Office Malformed String Parsing Vulnerability
From: research () symantec com
Date: 10 Jul 2006 17:43:43 -0000

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                Symantec Vulnerability Research
                http://www.symantec.com/research
                        Security Advisory


Advisory ID   : SYMSA-2006-007
Advisory Title: Microsoft Office Malformed String Parsing
                Vulnerability
Author        : Elia Florio / elia_florio () symantec com
Release Date  : 07-11-2006
Application   : Microsoft Office 2000, Office XP (2002),
                Office 2003
Platform      : Windows
Severity      : Remotely exploitable / User access
Vendor status : Duplicated and verified by Microsoft,
                patch available
CVE Number    : CVE-2006-1540
Reference     : http://www.securityfocus.com/bid/18889


Overview:

        There exists an overflow condition in Microsoft Office
        when a malformed string included in an Office file is
        parsed by any of the affected Office applications.


Details:

        The problem resides in the code of MSO.DLL, a shared
        library used by Office applications, so the vulnerability
        can be exploited using different attack vectors.
        For example, the vulnerability can be exploited using a
        malformed Excel 2003 file. By changing the size of the
        Unicode "Sheet Name" string with an incorrect size, it is
        possible to generate an integer overflow condition. Excel
        2003 will crash while opening the malformed file due to an
        access violation error with an invalid value of
        EAX=0xFFFFFFFC.

        MOV EDX,DWORD PTR DS:[EAX-4]
        ADD EAX,-4
        ADD EDX,4


Vendor Response:

        The above vulnerability was addressed for the affected
        platforms via Microsoft Security Bulletin MS06-38. If
        there are any further questions about this statement,
        please contact secure () microsoft com 


Recommendation:
        Follow your organization's testing procedures before
        applying patches or workarounds.  Customers should apply
        Microsoft's update as soon as possible.


Common Vulnerabilities and Exposures (CVE) Information:

The Common Vulnerabilities and Exposures (CVE) project has assigned
the following names to these issues.  These are candidates for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.

        CVE-2006-1540


- -------Symantec Vulnerability Research Advisory Information-------

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http://www.symantec.com/research/Symantec-Responsible-Disclosure.pdf

Symantec Vulnerability Research Advisory Archive:
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Symantec Vulnerability Research GPG Key:
http://www.symantec.com/research/Symantec_Consulting_Services_Advisories_GPG.asc

- -------------Symantec Product Advisory Information-------------

To Report a Security Vulnerability in a Symantec Product:
secure () symantec com

For general information on Symantec's Product Vulnerability
reporting and response:
http://www.symantec.com/security/

Symantec Product Advisory Archive:
http://www.symantec.com/avcenter/security/SymantecAdvisories.html

Symantec Product Advisory PGP Key:
http://www.symantec.com/security/Symantec-Vulnerability-Management-Key.asc

- ---------------------------------------------------------------

Copyright (c) 2006 by Symantec Corp.
Permission to redistribute this alert electronically is granted
as long as it is not edited in any way unless authorized by
Symantec Consulting Services. Reprinting the whole or part of
this alert in any medium other than electronically requires
permission from cs_advisories () symantec com 

Disclaimer
The information in the advisory is believed to be accurate at the
time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS
condition. There are no warranties with regard to this information.
Neither the author nor the publisher accepts any liability for any
direct, indirect, or consequential loss or damage arising from use
of, or reliance on, this information.

Symantec, Symantec products, and Symantec Consulting Services are
registered trademarks of Symantec Corp. and/or affiliated companies
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property of their respective companies/owners.
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