Investigate traffic of a C2 connection.

Use a AES-CRT padding oracle vulnerability to extract the flag.

Leak data and solve a sudoku.

Break a weak RSA cookie encryption system and retrieve the flag.

Find the original flag by brute forcing a modular equation.

Investigate a damaged disk.

Use XSS, RFI and some cyber skills get a shell on the server and escalate your privileges.

Exploit a simple known CVE and then escalate your privileges with fail2ban.

Exploit a self-implemented encryption system made with PHP.

You need to exploit some web vulnerabilities and enumerate in order to escalate privileges and gain root.