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

                       AL-2007.0122 -- AUSCERT ALERT
                                   [Win]
       Buffer overflow vulnerability in Lotus Notes file viewer for
                          Lotus 1-2-3 attachments
                             29 November 2007

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

Product:              IBM Lotus Notes
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
Member content until: Thursday, December 27 2007

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OVERVIEW:

       A buffer overflow vulnerability has been identified in Lotus Notes
       which if successfully exploited can result in the execution of
       arbitrary code.


IMPACT:

       IBM published the following regarding this vulnerability: 

       "Sebastin Muiz from the CORE IMPACT Exploit Writers Team (EWT) at 
       Core Security Technologies contacted IBM Lotus to report a 
       potential keyview buffer overflow vulnerability in Lotus Notes when 
       viewing a Lotus 1-2-3 (.123 extension) file attachment. In specific 
       situations it was found that the possibility exists to execute 
       arbitrary code.

       To successfully exploit this vulnerability, an attacker would need 
       to send a specially crafted Lotus 1-2-3 file attachment to users, 
       and the users would then have to double-click and View the 
       attachment.

       The issue impacts only Windows-based Notes clients; it does not 
       impact the Domino server." [1]


MITIGATION:

       For users of Lotus Notes 7.x and 8.x, you can contact IBM and 
       receive a patch, alternatively there is also a workaround for
       these versions. [1]

       Those who are using versions 5.x and 6.x, there are details of a 
       workaround available on the IBM website. [1]


REFERENCES:

       [1] Buffer overflow vulnerability in Lotus Notes file viewer for Lotus 
           1-2-3 attachments
           http://www-1.ibm.com/support/docview.wss?uid=swg21285600


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

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