BugTraq
Clean Master v1.0 - Unquoted Path Privilege Escalation Oct 05 2016 10:50AM
Vulnerability Lab (research vulnerability-lab com)
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 réussite(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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