[NEWS] Mozilla Firefox Certificate Spoofing

From: SecuriTeam (support_at_securiteam.com)
Date: 07/26/04

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Date: 26 Jul 2004 10:44:46 +0200

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      Mozilla Firefox Certificate Spoofing
    ------------------------------------------------------------------------

    SUMMARY

    Firefox has caching problem, as a result of that someone can spoof a
    certificate of any website and use it as his/her own. The problem is
    exploited using OnUnload inside <body> and redirection using HTTP-Equiv
    Refresh metatag, document.write() and document.close().

    DETAILS

    Vulnerable Systems:
     * Mozilla Firefox version 0.9.1
     * Mozilla Firefox version 0.9.2

    Technical details:
    First you direct the redirection Metatag to the website of which you want
    to spoof the certificate, then inside the < body> tag you add OnUnload
    script so you can control the output inside the web page with the spoofed
    certificate.

    After that you say to Firefox, as soon as you unload this page close the
    stream, apparently the stream you close is the redirection website, you do
    that with document.close().

    Now you can write anything you want, you do that using document.write().
    After writing the content of you choice you close the stream again,
    usually Firefox wont display your content, although if you check the
    source code you see it, so the last thing is to refresh the new page (do
    that using window.location.reload()), after that you have your domain name
    in the URL field , your content in the browser and the magic yellow Lock
    on the bottom left corner, if you pass your mouse over it you will see
    displayed the name of the website you spoofed the certificate, if you
    double click on it you will check full information of the certificate
    without any warning.

    You don t need to have SSL in your website, it will work with HTTP.

    Additional using this bug malicious websites can bypass content filtering
    using SSL properties.

    Proof Of Concept Code:
    < HTML>
    < HEAD>
    < TITLE>Spoofer< /TITLE>
    < META HTTP-EQUIV="REFRESH" CONTENT="0;URL=https://www.example.com">
    < /HEAD>
    < BODY
    onunload="
    document.close();
    document.writeln('< body onload=document.close();break;>
                < h3>It is Great to Use example\'s Cert!');
    document.close();
    window.location.reload();
    ">
    < /body>

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:me@cipher.org.uk>
    E.Kellinis.
    The original article can be found at:
    <http://www.cipher.org.uk/index.php?p=advisories/Certificate_Spoofing_Mozilla_FireFox_25-07-2004.advisory> http://www.cipher.org.uk/index.php?p=advisories/Certificate_Spoofing_Mozilla_FireFox_25-07-2004.advisory

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