[FD] WinSaber - Unquoted Service Path Privilege Escalation

[Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>]

Document Title:
===============
WinSaber - Unquoted Service Path Privilege Escalation


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1879


Release Date:
=============
2016-07-29


Vulnerability Laboratory ID (VL-ID):
====================================
1879


Common Vulnerability Scoring System:
====================================
4.2


Product & Service Introduction:
===============================
WinSaber.exe is an executable files developed by Innovative Knowledge for the 
Windows Operating System. 
This virus can infect, replace, or corrupt existing EXE files, which can then 
lead to error messages. Such file and 
its related exe files gets into the computer system hiding behind the programs 
which user downloads.

(Copy of the Homepage:  
http://www.mypccaresolutions.com/2016/07/14/get-rid-of-ads-bywinsaber-exe-virus/)


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered an unqouted 
service path privilege escalation issue in the WinSaber Trojan software.


Vulnerability Disclosure Timeline:
==================================
2016-07-26:     Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================

Exploitation Technique:
=======================
Local


Severity Level:
===============
Medium


Technical Details & Description:
================================
The application suffers from an unquoted search path issue impacting the trojan 
'winSaber'. This could potentially allow 
an authorized but non-privileged local user to execute arbitrary code with 
system privileges on the system.


Proof of Concept (PoC):
=======================
The issue can be exploited by local attackers with restricted system user 
account or network access and without user interaction.
For security demonstration or to reproduce the vulnerability follow the 
provided information and steps below to continue.


--- Privileges Logs ---
C:Program FilesWinSaber>sc qc WinSaber
[SC] QueryServiceConfig réussite(s)

SERVICE_NAME: WinSaber
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:Program FilesWinSaberWinSaber.exe
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : winsaber
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem


Security Risk:
==============
The security risk of the an unqouted service path privilege escalation in the 
malware software is estimated as medium. (CVSS 4.2)


Credits & Authors:
==================
ZwX -  [http://www.vulnerability-lab.com/show.php?user=ZwX]


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=========================
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