[Webkit-unassigned] [Bug 19536] New: DOM modification causes Access Violation (NULL pointer?)

Fri Jun 13 08:34:51 PDT 2008

https://bugs.webkit.org/show_bug.cgi?id=19536

           Summary: DOM modification causes Access Violation (NULL pointer?)
           Product: WebKit
           Version: 525.x (Safari 3.1)
          Platform: PC
               URL: http://skypher.com/SkyLined/Repro/Safari/00fc476f%20NULL
                    /repro.html
        OS/Version: Windows Vista
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: berendjanwever at gmail.com

I found that the following javascript causes an Access Violation. This appears
to be a NULL pointer:

<BODY onload="go()"><SCRIPT>
    function go() {
        document.body.parentElement.innerHTML='';
        oMarquee=document.createElement('marquee');

oMarquee.innerHTML='<frameSet></frameSet><colGroup></colGroup><em><label><meta></label></em><frameSet></frameSet>';
    }
</SCRIPT></BODY>

Tested with Safari 3.1.1.

Please note the NULL pointer happens in code that appears to want to call a
method in a vtable. Should the NULL value be attacker controlable, this is
extremely exploitable. I am assuming it is always NULL and not exploitable.

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