MailEnable Local Privilege Escalation

`[+] Credits: John Page AKA hyp3rlinx  
[+] Website: hyp3rlinx.altervista.org  
[+] Source:  
http://hyp3rlinx.altervista.org/advisories/MAILENABLE-MULTIPLE-PRIVILEGE-ESCALATIONS.txt  
[+] ISR: ApparitionSec  
  
  
  
Vendor:  
===================  
www.mailenable.com  
  
  
  
Products:  
============  
MailEnable  
  
  
MailEnable provides Windows Mail Server software with features comparable  
to Microsoft Exchange. It provides powerful messaging services  
like Exchange ActiveSync, IMAP, SMTP, POP3 and collaboration tools such as  
calendaring (CalDAV), contacts (CardDAV), tasks and notes.  
  
  
  
Vulnerability Type:  
===================  
Local Privilege Escalation (Unquoted Service Path)  
  
  
  
CVE Reference:  
==============  
N/A  
  
  
  
Security Issue:  
==================  
  
The following MailEnable product services contain multiple local privilege  
escalation vectors, potentially allowing unprivileged user to  
gain code execution as SYSTEM via unquoted service paths.  
  
Reference:  
https://www.mailenable.com/Standard-ReleaseNotes.txt  
  
  
c:\>sc qc MELCS  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: MELCS  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START  
ERROR_CONTROL : 0 IGNORE  
BINARY_PATH_NAME : C:\Program Files (x86)\Mail  
Enable\Bin64\MELSC.EXE  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : MailEnable List Connector  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
  
  
  
c:\>sc qc MEMTAS  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: MEMTAS  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START  
ERROR_CONTROL : 0 IGNORE  
BINARY_PATH_NAME : C:\Program Files (x86)\Mail  
Enable\Bin64\MEMTA.EXE  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : MailEnable Mail Transfer Agent  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
  
  
  
c:\>sc qc MEPOPS  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: MEPOPS  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START  
ERROR_CONTROL : 0 IGNORE  
BINARY_PATH_NAME : C:\Program Files (x86)\Mail  
Enable\Bin64\MEPOPS.EXE  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : MailEnable POP Service  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
  
  
c:\>sc qc MEPOCS  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: MEPOCS  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START  
ERROR_CONTROL : 0 IGNORE  
BINARY_PATH_NAME : C:\Program Files (x86)\Mail  
Enable\Bin64\MEPOC.EXE  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : MailEnable Postoffice Connector  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
  
  
  
c:\>sc qc MESMTPCS  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: MESMTPCS  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 2 AUTO_START  
ERROR_CONTROL : 0 IGNORE  
BINARY_PATH_NAME : C:\Program Files (x86)\Mail  
Enable\Bin64\MESMTPC.EXE  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : MailEnable SMTP Connector  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
  
  
  
  
  
  
Disclosure Timeline:  
=====================================  
Vendor Notification: January 5, 2017  
Vendor Acknowledgement: January 5, 2017  
Vendor Fix: January 5, 2017  
February 12, 2017 : Public Disclosure  
  
  
  
Exploit/POC:  
============  
  
1) Create EXE named 'Program.exe'  
  
  
2) Inject 'Program.exe' into the path of the service. After service restart  
or system reboot, authorized local user can  
then execute arbitrary code with elevated privileges as SYSTEM.  
  
  
  
  
Network Access:  
===============  
Local  
  
  
  
Severity:  
=========  
Medium  
  
  
  
  
[+] Disclaimer  
The information contained within this advisory is supplied "as-is" with no  
warranties or guarantees of fitness of use or otherwise.  
Permission is hereby granted for the redistribution of this advisory,  
provided that it is not altered except by reformatting it, and  
that due credit is given. Permission is explicitly given for insertion in  
vulnerability databases and similar, provided that due credit  
is given to the author. The author is not responsible for any misuse of the  
information contained herein and accepts no responsibility  
for any damage caused by the use or misuse of this information. The author  
prohibits any malicious use of security related information  
or exploits by the author or elsewhere.  
  
hyp3rlinx  
`