SYMSA-2006-007: Microsoft Office Malformed String Parsing Vulnerability

2006-07-11T00:00:00
ID SECURITYVULNS:DOC:13481
Type securityvulns
Reporter Securityvulns
Modified 2006-07-11T00:00:00

Description

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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
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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@symantec.com.

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