DVD Creator 4.1.0 - Insecure File Permissions Vulnerability

Document Title:
===============
DVD Creator 4.1.0 - Insecure File Permissions Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2104


Release Date:
=============
2017-11-28


Vulnerability Laboratory ID (VL-ID):
====================================
2104


Common Vulnerability Scoring System:
====================================
3.5


Vulnerability Class:
====================
Privilege Escalation


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
Burn video to DVD from all popular SD video formats, including AVI, MP4, MPG, MPEG, 3GP, WMV, ASF, RM, RMVB, DAT, MOV, etc.
Burn HD video like MTS, M2TS(AVCHD H.264), TS(MPEG-2), HD MKV(H.264, MPEG-2 HD), HD WMV(VC-1), HD MOV(H.264, MPEG-4), etc.
Make photo DVD slideshows from BMP, JPEG, PNG, TIFF, GIF, etc. and combine photos and videos together to preserve your memories.

(Copy of the Vendor : https://www.wondershare.com/pro/dvd-creator.html )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered an insecure file permission privilege escalation vulnerability in the official wondershare DVD Creator V4.1.0 software for Microsoft Windows.



Vulnerability Disclosure Timeline:
==================================
2017-11-28: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================

Exploitation Technique:
=======================
Local


Severity Level:
===============
Low


Technical Details & Description:
================================
An insecure file permissions vulnerability has been discovered in the official wondershare DVD Creator V4.1.0 software for Microsoft Windows.
The vulnerability allows local attackers with system user accounts to elevate the access of the process to gain higher system privileges.

The software is vulnerable to an elevation of privileges vulnerability which can be used by a simple user that can change the executable files 
with a binary of choice that is exectuable with the local system user permissions. The issue is located in the misconfigured permission values 
in the users and everyone group. The group/user permission of the path is assigned to the everyone group.  Local attackers are able to elevate 
the access permission of the software process by successful exploitation via process injection attack. 

The security risk of the issue is estimated as medium as medium (CVSS 3.5). Exploitation of the software vulnerability requires a low privilege 
system user account with restricted access without user interaction. Successful exploitation of the vulnerability results in system process 
compromise and further manipulation or exploitation to compromise the local computer operating system.


Proof of Concept (PoC):
=======================
The local privilege escalation vulnerability can be exploited by local attackers without user interaction and with system user account.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.


    Directory: C:ProgramFilesWondershareDVDCreator

BsSndRpt.exe                     BUILTINAdministrators      Everyone Allow  FullControl...
BugSplatHD.exe                   BUILTINAdministrators      Everyone Allow  FullControl...
CrashService.exe                 BUILTINAdministrators      Everyone Allow  FullControl...
CustomizedTool.exe               BUILTINAdministrators      Everyone Allow  FullControl...
DVDCreator.exe                   BUILTINAdministrators      Everyone Allow  FullControl...
unins000.exe                     BUILTINAdministrators      Everyone Allow  FullControl...
WSOverlay.exe                    BUILTINAdministrators      Everyone Allow  FullControl...
Wondershare Helper Compact.exe   BUILTINAdministrators      Everyone Allow  FullControl...


BsSndRpt.exe Everyone:(ID)F  <-----------------------
             NT AUTHORITYSYSTEM:(ID)F
             BUILTINAdministrators:(ID)F
             BUILTINUsers:(ID)R

BugSplatHD.exe Everyone:(ID)F  <-----------------------
             NT AUTHORITYSYSTEM:(ID)F
             BUILTINAdministrators:(ID)F
             BUILTINUsers:(ID)R

CrashService.exe Everyone:(ID)F  <-----------------------
             NT AUTHORITYSYSTEM:(ID)F
             BUILTINAdministrators:(ID)F
             BUILTINUsers:(ID)R

CustomizedTool.exe Everyone:(ID)F  <-----------------------
             NT AUTHORITYSYSTEM:(ID)F
             BUILTINAdministrators:(ID)F
             BUILTINUsers:(ID)R

DVDCreator.exe Everyone:(ID)F  <-----------------------
             NT AUTHORITYSYSTEM:(ID)F
             BUILTINAdministrators:(ID)F
             BUILTINUsers:(ID)R

unins000.exe Everyone:(ID)F  <-----------------------
             NT AUTHORITYSYSTEM:(ID)F
             BUILTINAdministrators:(ID)F
             BUILTINUsers:(ID)R

WSOverlay.exe Everyone:(ID)F  <-----------------------
             NT AUTHORITYSYSTEM:(ID)F
             BUILTINAdministrators:(ID)F
             BUILTINUsers:(ID)R


Path   : C:ProgramFilesWondershareDVDCreator
Owner  : BUILTINAdministrators
Group  : MACHINENone
Access : Everyone Allow  FullControl   <-----------------------

         NT SERVICETrustedInstaller Allow  FullControl
         NT SERVICETrustedInstaller Allow  268435456
         NT AUTHORITYSYSTEM Allow  FullControl
         NT AUTHORITYSYSTEM Allow  268435456
         BUILTINAdministrators Allow  FullControl
         BUILTINAdministrators Allow  268435456
         BUILTINUsers Allow  ReadAndExecute, Synchronize
         BUILTINUsers Allow  -1610612736
         CREATOR OWNER Allow  268435456

  Medium Mandatory Level (Default) [No-Write-Up]
  RW Everyone
        FILE_ALL_ACCESS  <-----------------------
  RW NT SERVICETrustedInstaller
        FILE_ALL_ACCESS
  RW NT AUTHORITYSYSTEM
        FILE_ALL_ACCESS
  RW BUILTINAdministrators
        FILE_ALL_ACCESS
  R  BUILTINUsers
        FILE_LIST_DIRECTORY
        FILE_READ_ATTRIBUTES
        FILE_READ_EA
        FILE_TRAVERSE
        SYNCHRONIZE
        READ_CONTROL





Security Risk:
==============
The security risk of the local  privilege escalation vulnerability in the wondershare DVD Creator V4.1.0 software for Microsoft Windows is estimated as medium (CVSS 3.5). 


Credits & Authors:
==================
SaifAllah benMassaoud [[email protected]] - @benmassaou - https://www.vulnerability-lab.com/show.php?user=S.AbenMassaoud


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=========================
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