SYMSA-2006-001: Buffer overflow in Microsoft Office 2000, Office XP (2002), and Office 2003 Routing Slip Metadata

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               Symantec Professional Services 

                     www.symantec.com
                    Security Advisory

Advisory ID : SYMSA-2006-001
Advisory Name: Buffer overflow in Microsoft Office 2000, Office XP
(2002), and Office 2003 Routing Slip Metadata.
Release Date : 03-14-2006
Application : Microsoft Word, Microsoft Excel, Microsoft PowerPoint,
Microsoft Outlook
Platform : Windows
Severity : Remotely exploitable / User access
Author : Ollie Whitehouse / [email protected]
Vendor Status: Duplicated and verified by Microsoft, patch available.
CVE Number : CVE-2006-0009
Reference : http://www.securityfocus.com/bid/17000

Overview:

    There exists a buffer overflow in Microsoft Word, Excel, 
    PowerPoint, and Outlook in the parsing of the routing slip
    metadata. The result is that when a user closes a malicious 
    document, arbitrary code can be executed on the host in 
    question.

Details:

    Microsoft Office supports the concept of routing slips. These 
    can be embedded within documents to ease the process of 
    collaborative working. During Symantec’s investigation it was 
    discovered that within the metadata of Microsoft’s document 
    format that there is both a length value and a null 
    terminated string for the different sections of a routing 
    slip. Upon further investigation it was discovered that the 
    affected applications allocate memory based on the size 
    contained within the length field, but then proceeds to copy 
    the entire string up until the null termination.

    The result in the case of Microsoft Word 2002 SP3 (fully 
    patched), is that we overwrite the saved return address on 
    the stack with a Unicode value. This can be used to obtain 
    control of the execution within the program.

    Microsoft Word, Excel, PowerPoint and Outlook all behave 
    slightly differently and in the case of Office 2003, it 
    appears that the values move from the stack to the heap 
    which makes exploitation more complicated, yet not impossible.

Vendor Response:

    The above vulnerability was addressed by Microsoft Security 
    Bulletin MS06-012. For details see 
    http://www.microsoft.com/technet/security/Bulletin/MS06-012.mspx

    If there are any further questions about this statement, 
    please contact Microsoft support.

Recommendation:
Apply the patch supplied by Microsoft according to your
organization's software maintenance test and deployment
procedures.

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-2006-0009

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Copyright (c) 2006 by Symantec Corp.
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