SSL VPNs and OpenVPN – Part II

Outsmart Malicious Hackers


2. Why OpenVPN

Here, in this article, I will lay down the emphasis on one important Open-Source SSL VPN software written by James Yonan and contributed by several others, which proposes security without the inherent complexity of IPsec AND using a trusted design of client component and VPN server.

Usually VPNs require end points which are trusted. The server and client are machines with elevated levels of trust as VPN components are installed on known machines which participate in corporate network according to security policy. Additionally, it is made sure that authentication credentials are pre-installed (in a secure way) on both of these devices so that each endpoint could authenticate each other.

SSL Remote Access connections nee. SSL Gateway clients, allow users to connect to VPN servers irrespective of the machine. The client can be any machine in cybercafe or public terminal. This brings us to two severe security issues. One, we break the trust model. The server and client no longer share the authentication credentials using secure channel.

Two, users connect from machines that are not subject to corporate security policies. Even if the user manages to start SSL session with SSL gateways, they are doing all their input and output on an unknown insecure machines that might as well be worm clearinghouses.

The propensity of a public machine loaded with keystroke loggers and remote management tools that allow the attacker to sniff passwords and collect session data is very high. Untrusted Clientless VPNs on an arbitrary machine is the weakest link in a security chain.
OpenVPN adheres to secure computing practices with a software component installed on the endpoints.

From the OpenVPN website:

“OpenVPN is a full-featured SSL VPN which implements OSI layer 2 or 3 secure network extension using the industry standard SSL/TLS protocol, supports flexible client authentication methods based on certificates, smart cards, and/or username/password credentials, and allows user or group-specific access control policies using firewall rules applied to the VPN virtual interface.
OpenVPN is not a web application proxy and does not operate through a web browser.”

Another reason: OpenVPN is FREE. And works on Linux like OS’s AND Windows.

Next: we will learn how to implement a VPN Tunnel using OpenVPN.

Read on in Part III

Previously:
1. SSL VPNs and Using OpenVPN : What is an SSL VPN

Posted in: Linux Hacking, Networking Hacking, Security Software

, , , , , ,


Latest Posts:


OWASP ZSC - Obfuscated Code Generator Tool OWASP ZSC – Obfuscated Code Generator Tool
OWASP ZSC is an open source obfuscated code generator tool in Python which lets you generate customized shellcodes and convert scripts to an obfuscated script.
A Look Back At 2017 – Tools & News Highlights A Look Back At 2017 – Tools & News Highlights
So here we are in 2018, taking a look back at 2017, quite a year it was. Here is a quick rundown of some of the best hacking/security tools released in 2017, the biggest news stories and the 10 most viewed posts on Darknet as a bonus.
Spectre & Meltdown Checker - Vulnerability Mitigation Tool For Linux Spectre & Meltdown Checker – Vulnerability Mitigation Tool For Linux
Spectre & Meltdown Checker is a simple shell script to tell if your Linux installation is vulnerable against the 3 "speculative execution" CVEs that were made public early 2018.
Hijacker - Reaver For Android Wifi Hacker App Hijacker – Reaver For Android Wifi Hacker App
Hijacker is a native GUI which provides Reaver for Android along with Aircrack-ng, Airodump-ng and MDK3 making it a powerful Wifi hacker app.
Sublist3r - Fast Python Subdomain Enumeration Tool Sublist3r – Fast Python Subdomain Enumeration Tool
Sublist3r is a Python-based tool designed to enumerate subdomains of websites using OSINT. It helps penetration testers and bug hunters collect and gather subdomains for the domain they are targeting.
coWPAtty Download - Audit Pre-shared WPA Keys coWPAtty Download – Audit Pre-shared WPA Keys
coWPAtty is a C-based tool for running a brute-force dictionary attack against WPA-PSK and audit pre-shared WPA keys.


Comments are closed.