[NEWS] Yahoo! Webcam ActiveX Control Buffer Overflow

From: SecuriTeam (support_at_securiteam.com)
Date: 09/21/03

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    Date: 21 Sep 2003 13:01:02 +0200

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      Yahoo! Webcam ActiveX Control Buffer Overflow


    Yahoo! Webcam Viewer Wrapper is an ActiveX control used by Webcam feature
    of Yahoo! Messenger and Yahoo! Chat also it can be installed from Internet
    as a stand-alone ActiveX control. This ActiveX control has a heap based
    overflow vulnerability.


    When a long value is set in Yahoo! Webcam Viewer Wrapper ActiveX control's
    "TargetName" property a stack and heap based buffer overflow occurs
    depending on the length of the string.

    To reproduce the overflow just cut-and-paste the following:

    < object id="yahoowebcam"
    classid="CLSID:E504EE6E-47C6-11D5-B8AB-00D0B78F3D48" >
    < script>

    As this ActiveX control is marked as safe, the above sample will run
    without being blocked in default Internet Explorer security configuration.
    This vulnerability can be exploited to run arbitrary code.

    If you have installed the ActiveX from Internet as a stand-alone ActiveX
    control or you have used Yahoo! Chat then:
     * Go to: %SystemRoot%\Downloaded Program Files\
     * Right Click on: Yahoo! Webcam Viewer Wrapper
     * Left Click: Remove

    By going to: <http://messenger.yahoo.com/messenger/security/>
    http://messenger.yahoo.com/messenger/security/ Yahoo! Messenger will
    prompt to update upon sign-in.


    The information has been provided by Cesar Cerrudo.


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    In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.

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