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Foxit Cloud Update Service Privilege Escalation

Foxit Cloud Update Service Privilege Escalation
Posted Oct 9, 2016
Authored by Ross Marks

Foxit Cloud Update Service suffers from an unquoted service path privilege escalation vulnerability.

tags | exploit
MD5 | 2ef32914cb3ccf395ea7fb6ddf7a0c59

Foxit Cloud Update Service Privilege Escalation

Change Mirror Download
Foxit Cloud Update Service:     https://www.foxitsoftware.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

Foxit reader's "cloud safe update 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 FoxitCloudUpdateService
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: FoxitCloudUpdateService
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : C:\Program Files (x86)\FOXIT SOFTWARE\FOXIT READER\Foxit Cloud\FCUpdateService.exe
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : Foxit Cloud Safe Update Service
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem

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