League Of Legends Screensaver Unquoted Service Path Privilege Escalation

`# Exploit Title: League of Legends Screensaver Unquoted Service Paths Conditional Privilege Escalation.  
# CVE-ID: NA  
# Date: 13/04/2016  
# Exploit Author: Vincent Yiu  
# Contact: [email protected]  
# Vendor Homepage: http://www.leagueoflegends.com  
# Software Link: screensaver.euw.leagueoflegends.com/en_US  
# Version: MD5 Hash: 0C1B02079CA8BF850D59DD870BC09963  
# Tested on: Windows 7 Professional x64 fully updated.  
  
1. Description:  
  
The League of Legends installer would install the League of Legends  
screensaver along with a service. The service would be called  
'lolscreensaver'. This particular service was misconfigured such that  
the service binary path was unquoted. When the screensaver is  
installed to 'C:\Riot Games', the issue is not exploitable. However,  
during the installation process, users are able to specify a directory  
to install to. When a user chooses to install this to say an external  
drive, this becomes exploitable.  
  
This was reported to Riot Games and has been rectified in the latest version.  
  
2. Proof  
http://i.imgur.com/S2fuUKa.png  
  
  
3. Exploit:  
  
Simply run 'sc qc lolscreensaver' and check for unquoted service path.  
If the path is unquoted, then check the permissions of each directory  
using space as a token.  
  
Eg. D:\My Games\Hidden Files\Super Secure\Riot Games\service\service.exe  
  
Do icacls on D:\, 'D:\My Games\', 'D:\My Games\Hidden Files\', 'D:\My  
Games\Hidden Files\Super Secure\'. If you are able to write files to  
any of these directories, it is exploitable.  
  
If 'D:\My Games\' is writable, to exploit this issue, place a binary  
to run as SYSTEM into the folder and named as 'Hidden.exe".  
  
  
This is released on exploit-db as a means to make users aware. There was no way to automatically install a patch or update to fix this issue. It is recommended that the screensaver is uninstalled and redownloaded from the official website where this issue is now resolved.  
`