Level - Easy
Description:
I know you really want the flag, so I'll print it out for you, but only after January 1st, 2024 :)
`nc byuctf.xyz 40007`
[2038]
This problem imitates the Year 2038 problem, where signed 32-bit integers can only go up to January 19th, 2038. Any number larger than that will overflow, causing it to be a negative value, starting in 1901. The date January 1st, 2024 in seconds since January 1st, 1970 is 1704067200. If you put in a number less than that, it will tell you it's too soon and exit early. If you put in a number larger than that, it will process it accordingly.
If you enter a number > 2147483647 and < 4294967296, it will overflow and allow you to choose a time before 1970, which means the print_flag function will be called.
Flag - byuctf{year_2038_problem_ftw}
2038 was compiled with gcc -o 2038 -fstack-protector 2038.c.
This challenge should be a Docker container that runs the executable 2038 every time someone connects on port 40007. All the proper files are included in here. The command to build the docker container is (when located inside of this directory):
sudo docker build -t 2038_chal .
sudo docker network create -d bridge 2038_chalThe command to start the challenge is:
sudo docker run -p 40007:40000 --detach --name 2038_chal --network 2038_chal 2038_chal:latestThe command to stop the challenge (since CTRL+C won't work) is:
sudo docker stop 2038_chal