Hola VPN 1.34 Privilege Escalation

`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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