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Wacom Consumer Service Privilege Escalation

Wacom Consumer Service Privilege Escalation
Posted Oct 9, 2016
Authored by Ross Marks

Wacom Consumer Service suffers from an unquoted service path privilege escalation vulnerability.

tags | exploit
MD5 | 2fb5f23385e7c90fd79a6eb4356ffe45

Wacom Consumer Service Privilege Escalation

Change Mirror Download
Wacom Consumer Service:     http://www.wacom.com
By Ross Marks: http://www.rossmarks.co.uk
Exploit-db: https://www.exploit-db.com/author/?a=8724
Category: Local
Tested on: Windows 10 x86/x64

1) Unquoted Service Path Privilege Escalation

Wacom's "Wacom Consumer Service" installs as a service with an unquoted service path running with SYSTEM privileges.
This could potentially allow an authorized but non-privileged localuser to execute arbitrary code with elevated privileges on the system.

A successful attempt would require the local attacker must insert an executable file in the path of the service.
Upon service restart or system reboot, the malicious code will be run with elevated privileges.

PoC:

C:\>sc qc WTabletServiceCon
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: WTabletServiceCon
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : C:\Program Files\Tablet\Pen\WtabletServiceCon.exe
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : Wacom Consumer Service
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem

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