I'm too lazy to write up in deep these challenges, but i will give you my solution to solve these challenges. You will do it by yourself before you read my exploit script, that makes you understand deeper. I hope you enjoy with this. Happy pwnning.

• Contacts: https://gist.github.com/peternguyen93/478baa59191e3108d0a3
• FTP: https://gist.github.com/peternguyen93/23fd065e4ce0afb9f242
• AutoBots: https://gist.github.com/peternguyen93/6a53ee3596ff89233710
• Memeshop: https://gist.github.com/peternguyen93/d9ffaa75eab24efeecc3
• Rhinoxorus: https://gist.github.com/peternguyen93/a5d79671bbc99ef75cb0