Document Title:
===============
Clean Master v1.0 - Unquoted Path Privilege Escalation


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=1968


Release Date:
=============
2016-10-05


Vulnerability Laboratory ID (VL-ID):
====================================
1968


Common Vulnerability Scoring System:
====================================
4


Product & Service Introduction:
===============================
Clean Master Cleaner is a powerful application dedicated to the cleaning of certain content Android terminal. It is able to remove 
all traces of activities performed on the Smartphone to free up space and increase performance. This app is able to best improve 
the security system of the device.
 
(Copy of the Vendor Homepage: http://www.cmcm.com/ )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered an unquoted service path privilege escalation vulnerability in the Clean Master v1.0 software.


Vulnerability Disclosure Timeline:
==================================
2016-10-05:  Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
CMCM
Product: Clean Master - Software (Client) 1.0


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


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


Technical Details & Description:
================================
The application suffers from an unquoted search path issue in the official Clean Master v1.0 software client. The issue allows authorized 
but unprivileged local users to execute arbitrary code with system privileges on the active system. The attack vector of the issue is local.

The security risk of the software vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 4.4. 
Exploitation of the software vulnerability requires a low privilege system user account with restricted access and without user interaction. 
Successful exploitation of the vulnerability results in system process compromise and further manipulation or exploitation to compromise the 
local computer operating 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.


--- PoC Privileges Access Logs ---
C:Program FilescmcmClean Master>sc qc cmcore
[SC] QueryServiceConfig rA(c)ussite(s)

SERVICE_NAME: cmcore
        TYPE               : 110  WIN32_OWN_PROCESS (interactive)
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : "c:program filescmcmClean Mastercmcore.exe" /service cmcore
        LOAD_ORDER_GROUP   : ShellSvcGroup
        TAG                : 0
        DISPLAY_NAME       : Clean Master Core Service
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem


Security Risk:
==============
The security risk of the unquoted service path privilege escalation issue in the software core is estimated as medium. (CVSS 4.4)


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


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