Ubisoft Uplay 4.6 Insecure File Permissions Local Privilege Escalation

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Ubisoft Uplay 4.6 Insecure File Permissions Local Privilege Escalation  
  
  
Vendor: Ubisoft Entertainment S.A.  
Product web page: http://www.ubi.com  
Affected version: 4.6.3208 (PC)  
4.5.2.3010 (PC)  
  
  
Summary: Uplay is a digital distribution, digital rights management,  
multiplayer and communications service created by Ubisoft to provide  
an experience similar to the achievements/trophies offered by various  
other game companies.  
  
- Uplay PC is a desktop client which replaces individual game launchers  
previously used for Ubisoft games. With Uplay PC, you have all your Uplay  
enabled games and Uplay services in the same place and you get access to  
a whole new set of features for your PC games.  
  
Desc: Uplay for PC suffers from an elevation of privileges vulnerability  
which can be used by a simple user that can change the executable file  
with a binary of choice. The vulnerability exist due to the improper  
permissions, with the 'F' flag (Full) for 'Everyone' group, making the  
entire directory 'Ubisoft Game Launcher' and its files and sub-dirs  
world-writable.  
  
Tested on: Microsoft Windows 7 Professional SP1 (EN)  
Microsoft Windows 7 Ultimate SP1 (EN)  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2014-5191  
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2014-5191.php  
  
Vendor: http://forums.ubi.com/forumdisplay.php/513-Uplay  
  
  
30.05.2014  
  
--  
  
  
=======================================================================  
  
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher>icacls *.exe |findstr Everyone  
UbisoftGameLauncher.exe Everyone:(I)(F)  
UbisoftGameLauncher64.exe Everyone:(I)(F)  
Uninstall.exe Everyone:(I)(F)  
Uplay.exe Everyone:(I)(F)  
UplayCrashReporter.exe Everyone:(I)(F)  
UplayService.exe Everyone:(I)(F)  
  
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher>  
  
  
=======================================================================  
  
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher>icacls Uplay.exe  
Uplay.exe Everyone:(I)(F)  
NT AUTHORITY\SYSTEM:(I)(F)  
BUILTIN\Administrators:(I)(F)  
BUILTIN\Users:(I)(RX)  
  
Successfully processed 1 files; Failed processing 0 files  
  
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher>  
  
=======================================================================  
  
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher>icacls *.exe |findstr (F)  
UbisoftGameLauncher.exe Everyone:(I)(F)  
NT AUTHORITY\SYSTEM:(I)(F)  
BUILTIN\Administrators:(I)(F)  
UbisoftGameLauncher64.exe Everyone:(I)(F)  
NT AUTHORITY\SYSTEM:(I)(F)  
BUILTIN\Administrators:(I)(F)  
Uninstall.exe Everyone:(I)(F)  
NT AUTHORITY\SYSTEM:(I)(F)  
BUILTIN\Administrators:(I)(F)  
Uplay.exe Everyone:(I)(F)  
NT AUTHORITY\SYSTEM:(I)(F)  
BUILTIN\Administrators:(I)(F)  
UplayCrashReporter.exe Everyone:(I)(F)  
NT AUTHORITY\SYSTEM:(I)(F)  
BUILTIN\Administrators:(I)(F)  
UplayService.exe Everyone:(I)(F)  
NT AUTHORITY\SYSTEM:(I)(F)  
BUILTIN\Administrators:(I)(F)  
  
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher>  
  
=======================================================================  
  
C:\Program Files (x86)\Ubisoft>icacls "Ubisoft Game Launcher"  
Ubisoft Game Launcher Everyone:(OI)(CI)(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  
  
C:\Program Files (x86)\Ubisoft>  
  
=======================================================================  
=======================================================================  
  
Changed permissions (vendor fix):  
---------------------------------  
  
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher>cacls Uplay.exe  
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\Uplay.exe BUILTIN\Users:(ID)(special access:)  
DELETE  
READ_CONTROL  
WRITE_DAC  
WRITE_OWNER  
STANDARD_RIGHTS_REQUIRED  
FILE_READ_DATA  
FILE_WRITE_DATA  
FILE_APPEND_DATA  
FILE_READ_EA  
FILE_WRITE_EA  
FILE_EXECUTE  
  
NT AUTHORITY\SYSTEM:(ID)F  
BUILTIN\Administrators:(ID)F  
BUILTIN\Users:(ID)R  
labpc\user4dmin:(ID)F  
  
  
C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher>  
  
=======================================================================  
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