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Hola VPN v1.34 - Privilege Escalation Vulnerability

Document Title:
===============
Hola VPN v1.34 - Privilege Escalation Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2062


Release Date:
=============
2017-05-03


Vulnerability Laboratory ID (VL-ID):
====================================
2062


Common Vulnerability Scoring System:
====================================
3.2


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


Product & Service Introduction:
===============================
Hola's goal is to make the internet faster, more open, and cheaper to operate. 
Hola is a collaborative (P2P) internet -- Hola works by sharing 
the idle resources of its users for the benefit of all. Hola provides several 
products based on this resource sharing technology:

Hola's VPN network allows consumers to browse the web privately, securely, and 
freely. Making the world wide web worldwide again. Hola is used 
by over 80 million people! Luminati has disrupted the way businesses conduct 
brand monitoring (checking the prices of their products in various stores), 
self-test (checking how their corporate site looks from multiple countries), 
anti ad-fraud and so on, by providing them a privacy network. Hola's Video 
CDN changes the game in video delivery. Designed as a service for video 
publishers, HolaCDN makes videos start faster, buffer less, and at a fraction 
of the costs of traditional businesses.

(Copy of the Vendor Homepage: http://hola.org/faq#intro-howfree )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered an privilege 
escalation vulnerability in the official Hola VPN v1.34 client software.


Vulnerability Disclosure Timeline:
==================================
2016-05-03:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Hola Networks Ltd
Product: Hola - VPN Software (Windows) 1.34


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


Severity Level:
===============
Medium


Technical Details & Description:
================================
A local privilege escalation vulnerability has been discovered in the official 
Hola VPN v1.34 client software.
The local security vulnerability allows an attackers to gain higher access 
privileges by exploitation of an 
insecure permission misconfiguration.

The software suffers from a local privilege escalation vulnerability. Users are 
able to change the files with 
executable access to a binary of choice. The issue is located in the 
misconfigured permission values with the 
`F`(full) flag in the users and everyone group. The group/user permission for 
the path is assigned to the 
everyone group. Local attackers could exploit the vulnerability by a replace of 
the `7za.exe` or 
`hola.exe`...etc files with a malicious executable file. The malicious file is 
exectuable with the 
local system user permissions.

The security risk of the vulnerability is estimated as medium (CVSS 3.2). 
Exploitation of the software vulnerability 
requires a low privilege system user account with restricted access and 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.


--- Session Logs (Privileges) ---
C:Program FilesHolaapp Everyone:F
C:Program FilesHoladb Everyone:F
C:Program FilesHolahola_svc.exe.cid Everyone:F
C:Program FilesHolahola_updater.exe.cid Everyone:F
C:Program FilesHolalog Everyone:F
C:Program FilesHolatemp Everyone:F

C:Program FilesHola
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

C:Program FilesHola Everyone:F 
NT SERVICETrustedInstaller:(ID)F
NT SERVICETrustedInstaller:(CI)(IO)(ID)F
NT AUTHORITYSYSTEM:(ID)F
NT AUTHORITYSYSTEM:(OI)(CI)(IO)(ID)F
BUILTINAdministrators:(ID)F
BUILTINAdministrators:(OI)(CI)(IO)(ID)F
BUILTINUsers:(ID)R
BUILTINUsers:(OI)(CI)(IO)(ID)(special access:)
GENERIC_READ
GENERIC_EXECUTE
CREATOR OWNER:(OI)(CI)(IO)(ID)F

7za.exe Everyone:(F)
        NT AUTHORITYSYSTEM:(I)(F)
        BUILTINAdministrators:(I)(F)
        BUILTINUsers:(I)(RX)
hola.exe Everyone:(F)
         NT AUTHORITYSYSTEM:(I)(F)
         BUILTINAdministrators:(I)(F)
         BUILTINUsers:(I)(RX)
hola_setup.exe NT AUTHORITYSYSTEM:(I)(F)
               BUILTINAdministrators:(I)(F)
               BUILTINUsers:(I)(RX)
hola_svc.exe Everyone:(F)
             NT AUTHORITYSYSTEM:(I)(F)
             BUILTINAdministrators:(I)(F)
             BUILTINUsers:(I)(RX)
hola_updater.exe Everyone:(F)
                 NT AUTHORITYSYSTEM:(I)(F)
                 BUILTINAdministrators:(I)(F)
                 BUILTINUsers:(I)(RX)


Security Risk:
==============
The security risk of the local privilege escalation vulnerability in the Hola 
VPN v1.34 client software is estimated as medium (CVSS 3.2).


Credits & Authors:
==================
Vulnerability Laboratory [Core Research Team] - SaifAllah benMassaoud 
(http://www.vulnerability-lab.com/show.php?user=SaifAllahbenMassaoud)


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