Perfect Privacy VPN Manager v1.10.11 - DoS Vulnerability

Document Title:
===============
Perfect Privacy VPN Manager v1.10.11 - DoS Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2102

Ticket: https://board.perfect-privacy.com/threads/reporting-a-security-bug-in-vpn-software-client-for-windows.2223/

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16637

CVE-ID:
=======
CVE-2017-16637


Release Date:
=============
2017-11-01


Vulnerability Laboratory ID (VL-ID):
====================================
2102


Common Vulnerability Scoring System:
====================================
3.8


Vulnerability Class:
====================
Insecure Configuration Management


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
With Perfect Privacy as your VPN provider you have free access to our VPN client software with many advanced features.
Our software, which is developed completely in-house, will automatically update itself and the configuration files so 
that you can be sure that your software and configuration is always up to date. The Perfect Privacy VPN Manager for 
Windows (Vista/7/8/10) offers a lot of additional features that can improve comfort, speed and security. This document 
explains how to make best use of the functionality of our software.

(Copy of the Homepage: https://www.perfect-privacy.com/vpn-client/ )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a local denial of service vulnerability in the Perfect Privacy VPN Manager v1.10.11.0 windows software.


Vulnerability Disclosure Timeline:
==================================
2017-09-28: Researcher Notification & Coordination (Security Researcher)
2017-09-29: Vendor Notification (Security Department)
2017-10-17: Vendor Response/Feedback (Security Department)
2017-10-18: Vendor Fix/Patch (Service Developer Team)
2017-10-18: Security Acknowledgements  (Security Department)
2017-11-01: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Vectura Datamanagement Limited Company
Product: Perfect Privacy VPN Manager - Software (Client) v1.10.11


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


Severity Level:
===============
Low


Technical Details & Description:
================================
When resetting the network data via the software client, with a running VPN connection, a critical error occurs 
which leads to the "FrmAdvancedProtection". Although the mechanism is malfunctioned and an error occurs during 
the runtime with the stack trace being issued, the software process is not properly terminated. The software client 
is still attempting to maintain the connection even though the network connection information is being reset live.
In that insecure mode the "FrmAdvancedProtection" component crashs but the process continues to run with different 
errors and process corruptions.


Proof of Concept (PoC):
=======================
The local corruption vulnerability can be exploited by local attackers without user interaction with privileged system user account.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

Manual steps to reproduce ...
1. Install the perfect privacy vpn manager software client
2. Start the software
3. Connect to a random vpn server of the server list
4. Move to settings and open the others tab
5. Reset the network settings in the live running mode
Note: Multiple errors and uncaught exceptions occur and the process continues to run
6. Successful reproduce of the issue!


Solution - Fix & Patch:
=======================
The issue has been resolved by the vpn manager development team due to the 2017-10-18. 
The patched version is available by download via perfect privacy vpn software client in v1.10.12.


Security Risk:
==============
The security risk of the critical issue in the perfect privacy vpn manager software client is estimated as medium (CVSS 3.8).


Credits & Authors:
==================
Vulnerability-Lab [[email protected]] - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab


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