Cybersecurity Tasks

Task 01

Cryptography

The challenge is a simple cipher challenge that has the flag in the format BYTE{...}.

Find the flag that is in the format BYTE{}

Task 02

Steganography

The challenge is a PNG file that has been corrupted. Find the flag in the format flag{...}.

Find the flag that is in the format flag{}

Task 03

Binary Exploitation

This challenge uses an insecure memory buffer, also known as a buffer overflow. Exploit it to reach the part of the program that contains the flag in the format BYTE{...}. The flag in the provided dummy binary is fake. The actual challenge runs as a remote service; connect with Netcat (nc) using the supplied host and port.

• Download the provided ZIP and extract it. Keep all extracted files in the same folder.
• Run chall.sh to start the local challenge. Analyze the dummy binary to find and understand the insecure buffer and how the vulnerability is triggered.
• The flag in the local dummy binary is fake. After analyzing it, connect to the remote instance at nc cybersub.bytesoc.dev 9999 or solve it with a script you wrote.
• Submit your solution as part of the Cyber Security submission.

Find the flag that is in the format BYTE{}