BitRaider Streaming Client 1.3.3.4098 Local Privilege Escalation Vulnerability


Vendor: BitRaider, LLC
Product web page: http://www.bitraider.com
Affected version: 1.3.3.4098

Summary: BitRaider is a video game streaming and download service.

Desc: BitRaider contains a flaw that leads to unauthorized privileges being gained.
The issue is due to the program granting improper permissions with the 'F' flag for
the 'Users' group, which makes the entire 'BitRaider' directory and its sub directories
and files world-writable. This may allow a local attacker to change an executable file
with a binary file and gain elevated privileges.

List of executables affected:

o====================================================================================================o
|                      Binary/location                          |            Description             |
|                                                               |                                    |
|=============================================================== ====================================|
| C:\ProgramData\BitRaider\BRSptStub.exe                        |  BitRaider Support Stub            |
|---------------------------------------------------------------|------------------------------------|
| C:\ProgramData\BitRaider\common\BRException.exe               |  BitRaider Exception Handler       |
|---------------------------------------------------------------|------------------------------------|
| C:\ProgramData\BitRaider\common\brwc.exe                      |  BitRaider Distribution Web Client |
|---------------------------------------------------------------|------------------------------------|
| C:\ProgramData\BitRaider\support\1.3.3\E02B25FC\BRSptSvc.exe  |  BitRaider Support Service Core    |
o====================================================================================================o


Tested on: Microsoft Windows 7 Professional SP1 (EN)


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2014-5217
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2014-5217.php


17.12.2014

----


C:\Users\user>sc qc BRSptStub
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: BRSptStub
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 3   DEMAND_START
        ERROR_CONTROL      : 0   IGNORE
        BINARY_PATH_NAME   : "C:\ProgramData\BitRaider\BRSptStub.exe"
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : BitRaider Mini-Support Service Stub Loader
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem

C:\Users\user>icacls "C:\ProgramData\BitRaider\BRSptStub.exe"
C:\ProgramData\BitRaider\BRSptStub.exe BUILTIN\Users:(F)   <--------------------------
                                       NT AUTHORITY\SYSTEM:(F)
                                       NT AUTHORITY\Authenticated Users:(F)   <-------
                                       BUILTIN\Administrators:(F)
                                       NT AUTHORITY\INTERACTIVE:(F)   <---------------
                                       NT AUTHORITY\SERVICE:(F)
                                       BUILTIN\Guests:(RX)
                                       BUILTIN\Users:(I)(F)   <-----------------------
                                       NT AUTHORITY\SYSTEM:(I)(F)
                                       NT AUTHORITY\Authenticated Users:(I)(F)   <----
                                       BUILTIN\Administrators:(I)(F)
                                       NT AUTHORITY\INTERACTIVE:(I)(F)   <------------
                                       NT AUTHORITY\SERVICE:(I)(F)
                                       BUILTIN\Guests:(I)(RX)

Successfully processed 1 files; Failed processing 0 files

C:\Users\user>