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Fitbit Connect Service Privilege Escalation

Fitbit Connect Service Privilege Escalation
Posted Oct 9, 2016
Authored by Ross Marks

Fitbit Connect Service suffers from an unquoted service path privilege escalation vulnerability.

tags | exploit
SHA-256 | 2b497dec790cdab57c83eefd3f764c044b347739ec4ac796d5160b1aba7166d4

Fitbit Connect Service Privilege Escalation

Change Mirror Download
Fitbit Connect Service: https://www.fitbit.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

Fitbit connect 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 "Fitbit Connect"
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: Fitbit Connect
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : C:\Program Files (x86)\Fitbit Connect\FitbitConnectService.exe
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : Fitbit Connect Service
DEPENDENCIES :
SERVICE_START_NAME : NT AUTHORITY\NetworkService

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