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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2007.0015 -- AUSCERT ALERT
                                [Win][OSX]
          Unpatched Vulnerability in Microsoft Office Could Allow
                           Remote Code Execution
                              6 February 2007

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        AusCERT Alert Summary
        ---------------------

Product:              Microsoft Office XP
                      Microsoft Office 2003
                      Microsoft Office 2000
                      Microsoft Office 2004 for Mac
Publisher:            Microsoft
Operating System:     Windows
                      Mac OS X
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-0671

Original Bulletin:
  http://www.microsoft.com/technet/security/advisory/932553.mspx

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Microsoft Security Advisory - Vulnerability in Microsoft Office Could Allow
                              Remote Code Execution (932553)

Affected Software:
    - Microsoft Office 2004 for Mac
    - Microsoft Office 2003
    - Microsoft Office XP
    - Microsoft Office 2000

Unaffected Software:
    - Microsoft Office 2007
    - Microsoft Works 2006
    - Microsoft Works 2005
    - Microsoft Works 2004

Full Advisory:
    http://www.microsoft.com/technet/security/advisory/932553.mspx

Vulnerability Details

CVE-2007-0671

    Microsoft is investigating new public reports of very limited Microsoft
    Excel zero-day attacks using a vulnerability in Microsoft Office 2000,
    Microsoft Office XP, Microsoft Office 2003, and Microsoft Office 2004
    for Mac

    In order for this attack to be carried out, a user must first open a
    malicious Office file attached to an e-mail or otherwise provided to
    them by an attacker.

    While we are currently only aware that Excel is the current attack
    vector, other Office applications are potentially vulnerable.

    As a best practice, users should always exercise extreme caution when
    opening unsolicited attachments from both known and unknown sources.
    Microsoft has added detection to the Windows Live OneCare safety
    scanner for up-to-date removal of malicious software that attempts to
    exploit this vulnerability.

    Upon completion of this investigation, Microsoft will take the
    appropriate action to help protect our customers. This may include
    providing a security update through our monthly release process or
    providing an out-of-cycle security update, depending on customer needs.

    An attacker who successfully exploited this vulnerability could gain the
    same user rights as the local user. Users whose accounts are configured
    to have fewer user rights on the system could be less affected than users
    who operate with administrative user rights.

    In a Web-based attack scenario, an attacker would have to host a Web site
    that contains a Office file that is used to attempt to exploit this
    vulnerability. In addition, compromised Web sites and Web sites that
    accept or host user-provided content could contain specially crafted
    content that could exploit this vulnerability. An attacker would have no
    way to force users to visit a malicious Web site. Instead, an attacker
    would have to persuade them to visit the Web site, typically by getting
    them to click a link that takes them to the attacker's site.

    The vulnerability cannot be exploited automatically through e-mail. For
    an attack to be successful a user must open an attachment that is sent
    in an e-mail message.

    Users who have installed and are using the Office Document Open
    Confirmation Tool for Office 2000 will be prompted with Open, Save, or
    Cancel before opening a document.

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        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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