Document Title: =============== ZTE Ucell 3G Modem App - Privilege Escalation Vulnerability
References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1387 Release Date: ============= 2014-12-24 Vulnerability Laboratory ID (VL-ID): ==================================== 1387 Common Vulnerability Scoring System: ==================================== 6 Product & Service Introduction: =============================== Ucell application for users to support mobile broadband (3G) activation for du service provider with systems containing one of thesupported devices. It lets you access du wireless internet wherever you are and whenever you need it, all powered through your mobile data SIM or simply by connecting your 3G USB stick to your device. (Copy of the Vendor Homepage: http://ucell.uz/en/subscribers/devices/modems/upgrade_your_modem ) Abstract Advisory Information: ============================== An independent Vulnerability Laboratory Researcher discovered a local privilege escalation vulnerability in the official ZTE Ucell 3G Modem software. Vulnerability Disclosure Timeline: ================================== 2014-12-23: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Local Severity Level: =============== High Technical Details & Description: ================================ A local privilege escalation vulnerability has been discovered in the official ZTE Ucell 3G Modem application software. The local security vulnerability allows an attackers to gain higher access privileges by execution of arbitrary codes. The application is vulnerable to an elevation of privileges vulnerability which can be used by a simple user that can change the executable file with a binary of choice. The vulnerability exist due to the improper permissions, with the `F` flag (full) for the `Everyone`(Tout le monde:F) and `Users` group, for the all binary file. The files are installed in the `Ucell Internet` directory which has the Everyone group assigned to it with full permissions making every single file inside vulnerable to change by any user on the affected machine. After you replace the binary with your rootkit, on reboot you get SYSTEM privileges. The security risk of the local privilege escalation vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.1. 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 vulnerability can be exploited by local attackers with restricted account privileges and without user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. --- PoC Session Logs --- C:\Users\s-dz\Desktop>cacls "C:\Program Files\Ucell Internet" C:\Program Files\Ucell Internet Tout le monde:F Tout le monde:(OI)(CI)(IO)F NT SERVICE\TrustedInstaller:(ID)F NT SERVICE\TrustedInstaller:(CI)(IO)(ID)F AUTORITE NT\Système:(ID)F AUTORITE NT\Système:(OI)(CI)(IO)(ID)F BUILTIN\Administrateurs:(ID)F BUILTIN\Administrateurs:(OI)(CI)(IO)(ID)F BUILTIN\Utilisateurs:(ID)R BUILTIN\Utilisateurs:(OI)(CI)(IO)(ID)(accès spécial :) GENERIC_READ GENERIC_EXECUTE CREATEUR PROPRIETAIRE:(OI)(CI)(IO)(ID)F C:\Users\s-dz\Desktop>accesschk.exe -dqv "C:\Program Files\Ucell Internet" C:\Program Files\Ucell Internet Medium Mandatory Level (Default) [No-Write-Up] RW Tout le monde FILE_ALL_ACCESS RW NT SERVICE\TrustedInstaller FILE_ALL_ACCESS RW AUTORITE NT\SystÞme FILE_ALL_ACCESS RW BUILTIN\Administrateurs FILE_ALL_ACCESS R BUILTIN\Utilisateurs FILE_LIST_DIRECTORY FILE_READ_ATTRIBUTES FILE_READ_EA FILE_TRAVERSE SYNCHRONIZE READ_CONTROL C:\Users\s-dz\Desktop> Security Risk: ============== The security risk of the local privilege escalatation software vulnerability is estimated as high. (CVSS 6.0) Credits & Authors: ================== Hadji Samir s...@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. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material. 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