Game Packets
The DEFCON 17 CTF packet captures are available to the public. The download is approx 1.5GB, but be warned it will uncompress to approx 7.5GB. The pcap files are 100 MB each so that people with pansy tools that can't handle GBs of network traffic (or folks with crappy filesystems) can still play at home. Simply concatenate them together for single file goodness. This year SSH traffic was stripped out to reduce the size of the dataset.
Game Binaries
The services deployed to the image for each team can be found here: binaries. Load them into IDA or xxd you can feel like you were there! (plus some may find this super helpful after looking at the above network traffic).
buddy the elf service
This service is a TCP/UDP state machine that accepts input based on the manner is which the client specfies ports for either incoming or outgoing TCP or UDP connections. At each step in the state machine, the machine accepts an input byte that dictates what the next state of the machine will be. The fours states the server can be in are tcp receive, udp receive, tcp send, and udp send. By successfully driving the server machine through various states, the client can write a payload into a stack buffer, and overwrite a saved return address. The different states require the client to occasionally open tcp and udp listeners that the server will connect to in order to learn what the next state should be. A proof of concept exploit is available courtesy of Mars.