Get the Whitepaper called From Zero to ZeroDay Journey: Router Hacking (WRT54GL Linksys Case).
You can download it from the following link: https://packetstormsecurity.com/files/download/142037/From_Zero_To_Zeroday.txt
Source: https://packetstormsecurity.com/files/142037/From-Zero-to-ZeroDay-Journey-Router-Hacking.html