A new way to bypass Windows heap protections:

Windows heap overflows have become increasingly popular over the last couple of years. Papers like, "Third Generation Exploitation" [ref 1] or, "Windows Heap Overflows" [ref 2] introduced the internal structure and handling mechanisms of Windows heaps, and presented ways to exploit heap-based buffer overflows. Techniques to make highly reliable exploits were presented in the paper, "Reliable Windows Exploits" [ref 3]. Heap exploitation is now mastered for systems such as Windows XP, Windows XP SP1 and Windows 2000.