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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 (at) symantec (dot) com [email concealed]

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 (at) microsoft (dot) com. [email concealed]

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

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Symantec Vulnerability Research Advisory Archive:

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

To Report a Security Vulnerability in a Symantec Product:

secure (at) symantec (dot) com [email concealed]

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

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

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 (at) symantec (dot) com. [email concealed]

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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