Photo Nettoyeur 1.4.5 Insecure File Permission Vulnerability

i>>?#--------------------------------------------------------#
#Exploit Title: Photo Nettoyeur 1.4.5 - Insecure File Permission
#Exploit Author : ZwX
#Vendor Homepage : http://www.marseillesoft.com/
#Link Software : http://www.marseillesoft.com/telecharger/
#Tested on OS: Windows 7 & Windows 10
#Social: twitter.com/ZwX2a
#contact: [email protected]
#Website: http://zwx-pentester.fr/
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Technical Details & Description:
================================
The Photo Nettoyeur suffers from an elevation of privileges vulnerability which can be used by a simple authenticated 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)'C' (Write change) 'M' (Modify) for 'Users' group.
This gives an authenticated attacker the ability to modify or overwrite any file in the directory 
with malicious code (trojan or a rootkit). This could result in escalation of privileges or malicious effects on the systeme


Proof of Concept (PoC):
=======================
For security demonstration or to reproduce follow the provided information and steps below to continue.

C:\>cacls PhotoNettoyeur
C:\PhotoNettoyeur BUILTIN\Administrateurs:(ID)F                             <---- Full access
                  BUILTIN\Administrateurs:(OI)(CI)(IO)(ID)F
                  AUTORITE NT\SystA"me:(ID)F
                  AUTORITE NT\SystA"me:(OI)(CI)(IO)(ID)F
                  BUILTIN\Utilisateurs:(OI)(CI)(ID)R
                  AUTORITE NT\Utilisateurs authentifiA(c)s:(ID)C
                  AUTORITE NT\Utilisateurs authentifiA(c)s:(OI)(CI)(IO)(ID)C   <---- Edit
          
C:\PhotoNettoyeur>cacls PhotoNettoyeur.exe
PhotoNettoyeur.exe BUILTIN\Administrateurs:(ID)F                            <---- Full access
                   AUTORITE NT\SystA"me:(ID)F
                   BUILTIN\Utilisateurs:(ID)R
                   AUTORITE NT\Utilisateurs authentifiA(c)s:(ID)C              <---- Edit


C:\>icacls PhotoNettoyeur
PhotoNettoyeur BUILTIN\Administrateurs:(I)(F)                               <---- Full access
               BUILTIN\Administrateurs:(I)(OI)(CI)(IO)(F)
               AUTORITE NT\SystA"me:(I)(F)
               AUTORITE NT\SystA"me:(I)(OI)(CI)(IO)(F)
               BUILTIN\Utilisateurs:(I)(OI)(CI)(RX)
               AUTORITE NT\Utilisateurs authentifiA(c)s:(I)(M)
               AUTORITE NT\Utilisateurs authentifiA(c)s:(I)(OI)(CI)(IO)(M)     <---- Modify

C:\PhotoNettoyeur>icacls PhotoNettoyeur.exe
PhotoNettoyeur.exe BUILTIN\Administrateurs:(I)(F)                           <---- Full access
                   AUTORITE NT\SystA"me:(I)(F)
                   BUILTIN\Utilisateurs:(I)(RX)
                   AUTORITE NT\Utilisateurs authentifiA(c)s:(I)(M)             <---- Modify

#  0day.today [2018-10-06]  #