Whitepaper discussing the exploitation of buffer overflows on Linux x86_64. It demonstrates techniques to bypass PaX and ASLR protection and includes two proof of concept exploits. Written in Spanish.
You can download it from the following link: https://packetstormsecurity.com/files/download/59996/overflows.en.linux.x64.spanish.txt
Source: https://packetstormsecurity.com/files/59996/overflows.en.linux.x64.spanish.txt.html