QueueR is an information security challenge in the miscellaneous category, and was presented to participants of KAF CTF 2019
I found that pcap file on the USB drive of a communist developer I know. Can you find out what he's trying to say?
Based on the pcap file, we can understand the protocol is like this: the server sends a PNG file that is a QR code. The QR code represents an ISBN number, that leads to a corresponding book, which the client responds to the server. We can create a script that does that and gets the flag eventually. This is a script that does that.
Clone the repository, then type the following command to build the container:
docker build . -t queuerTo run the challenge, execute the following command:
docker run --rm -d -p 6010:8000 queuerYou may now access the challenge interface through netcat: nc 127.0.0.1 8000
Flag is:
KAF{k4r1_m4rx_15_7h3_b357}