The Isolated Heap for DOM objects included in the Microsoft Patch Tuesday for June 2014 was just a fire drill aimed at making the exploitation of use-after-free (UAF) vulnerabilities more difficult. The patch for July 2014, however, has been quite a shock to exploit developers! In this release, Microsoft showed some determination in fighting back against UAF bugs with this improvement - the introduction of a new memory protector in Microsoft Internet Explorer, which would make exploitation of UAF vulnerabilities extremely difficult.
more here...............http://blog.fortinet.com/Is-use-after-free-exploitation-dead--The-new-IE-memory-protector-will-tell-you/
more here...............http://blog.fortinet.com/Is-use-after-free-exploitation-dead--The-new-IE-memory-protector-will-tell-you/