Get the Whitepaper called Defeating Data Execution Prevention and ASLR in Windows XP SP3. Data prevention Execution (DEP) and Address space layout randomization (ASLR) are two protection mechanisms integrated in Windows operating system to make more complicated the task of exploiting software. This document show how these two features can be bypassed using different techniques.
You can download it from the following link: https://packetstormsecurity.com/files/download/102813/defeating_data_execution_prevention_and_aslr_in_windows_xp_sp3.pdf
Source: https://packetstormsecurity.com/files/102813/Defeating-Data-Execution-Prevention-And-ASLR-In-Windows-XP-SP3.html