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

Type securityvulns
Reporter Securityvulns
Modified 2006-07-11T00:00:00



            Symantec Vulnerability Research
                    Security Advisory

Advisory ID : SYMSA-2006-007 Advisory Title: Microsoft Office Malformed String Parsing Vulnerability Author : Elia Florio / 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 :


    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.


    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.

    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

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 (, which standardizes names for security problems.

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