Pronestor Health Monitoring < 8.1.11.0 - Privilege Escalation

• Exploit Database
• 17 阅读

• 作者： PovlTekstTV
  日期： 2019-06-13
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/46988/

• [Summary]
  The Pronestor service "PNHM" (aka Health Monitoring or HealthMonitor) 
  before 8.1.12.0 has "BUILTIN\Users:(I)(F)" permissions for 
  the "%PROGRAMFILES(X86)%\proNestor\Outlook add-in for Pronestor\PronestorHealthMonitor.exe" file, 
  which allows local users to gain privileges via a Trojan horse PronestorHealthMonitor.exe file.
  
  During the installation of Pronestors Outlook-Add-In (version 8.1.11.0 
  and older) the installer creates a service named PNHM (Pronester 
  Health Monitoring) with weak file permission running as SYSTEM.
  The vulnerability allows all "Authenticated Users" to potentially 
  execute arbitrary code as SYSTEM on the local system.
  
  [Additional Information]
  Tested on Windows 7.
  Version: Outlook Add-In 8.1.11.0 and older
  Also tested on version 5.1.6.0 with same result.
  Discovered: 06-nov-2018
  Reported: 07-nov-2018
  
  Vendor: https://www.pronestor.com/
  Vendor confirmed: True
  Fixed: Version 8.1.12.0
  Attack Type: Local Privilege Escalation
  Vulnerability due to: Insecure Permissions
  Discoverer: PovlTekstTV
  CVE: 2018-19113
  Original link: https://gist.github.com/povlteksttv/8f990e11576e1e90e8fb61acf8646d28
  
  [Proof]
  C:\Users\povltekst>sc qc PNHM
  
  SERVICE_NAME: PNHM
  TYPE : 10WIN32_OWN_PROCESS
  START_TYPE : 2 AUTO_START
  ERROR_CONTROL: 1 NORMAL
  BINARY_PATH_NAME : "C:\Program Files (x86)\proNestor\Outlook add-in for Pronestor\PronestorHealthMonitor.exe"
  LOAD_ORDER_GROUP :
  TAG: 0
  DISPLAY_NAME : Pronestor HealthMonitor
  DEPENDENCIES :
  SERVICE_START_NAME : LocalSystem
  
  C:\Users\povltekst>icacls 'C:\Program Files (x86)\proNestor\Outlook add-in for Pronestor\PronestorHealthMonitor.exe'
  C:\Program Files (x86)\proNestor\Outlook add-in for Pronestor\PronestorHealthMonitor.exe
   BUILTIN\Users:(I)(F)
   NT AUTHORITY\SYSTEM:(I)(F)
   BUILTIN\Administrators:(I)(F)
  
  Notice: "BUILIN\Users:(I)(F)". (F) = Full access!
  This means that an authenticated user can change the file
  
  [Attack Vectors]
  Replace the file "PronestorHealthMonitor.exe" with a malicious file 
  also called "PronesterHealthMonitor.exe". Next time the service (PNHM) 
  starts, the malicious file will get executed as SYSTEM. The service 
  starts on every reboot.
  
  [Affected Component]
  PronestorHealthMonitor.exe
  This exe will be executed on every reboot by a service named PNHM running as SYSTEM.