Valve Steam 3.42.16.13 – Local Privilege Escalation

• Exploit Database
• 22 阅读

• 作者： Gregory Smiley
  日期： 2016-06-06
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/39888/

• # Exploit Title: Valve Steam 3.42.16.13 Local Privilege Escalation
  # CVE-ID: CVE-2016-5237
  # Date: 5/11/52016
  # Exploit Author: gsX
  # Contact: gsx0r.sec@gmail.com
  # Vendor Homepage: http://www.valvesoftware.com/
  # Software Link: http://store.steampowered.com/about/
  #Version: File Version 3.42.16.13, Built: Apr 29 2016, Steam API: v017, Steam package versions: 1461972496
  # Tested on: Windows 7 Professional x64 fully updated.
  
  
  1. Description:
  
  The Steam directory located at C:\Program Files (x86)\Steam implement weak
  file permissions
  and allow anyone in the BUILTIN\Users windows group to modify any file in
  the Steam directory and any of its child files and folders.
  
  Since Steam is a startup application by default this makes it particularly
  easy to achieve lateral/vertical privilege escalation and achieve code
  execution against any user running the application.
  
  
  2. Proof
  
  C:\Program Files (x86)>icacls Steam
  Steam BUILTIN\Users:(F)
  BUILTIN\Users:(OI)(CI)(IO)(F)
  NT AUTHORITY\SYSTEM:(F)
  NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(F)
  NT SERVICE\TrustedInstaller:(I)(F)
  NT SERVICE\TrustedInstaller:(I)(CI)(IO)(F)
  NT AUTHORITY\SYSTEM:(I)(F)
  NT AUTHORITY\SYSTEM:(I)(OI)(CI)(IO)(F)
  BUILTIN\Administrators:(I)(F)
  BUILTIN\Administrators:(I)(OI)(CI)(IO)(F)
  BUILTIN\Users:(I)(RX)
  BUILTIN\Users:(I)(OI)(CI)(IO)(GR,GE)
  CREATOR OWNER:(I)(OI)(CI)(IO)(F)
  
  Successfully processed 1 files; Failed processing 0 files
  
  
  3. Exploit:
  
  Simply backdoor/replace Steam.exe or any other related exe's/dll'swith
  the code you want to
  run.
  
  I would like to note that I contacted Valve on several occasions
  and gave them plenty of time to reply/fix the issue before releasing this
  entry.