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VORACLE Attack: Are KeepSolid VPN Unlimited Users Safe?

3 min read

Breaking news has set the world of VPN services on fire. On August 11, 2018, the 26th DEF CON Hacking Conference was hosted in Las Vegas, Nevada. Ahamed Nafeez, an independent speaker and security researcher, reported about a discovered vulnerability in the OpenVPN® protocol, called VORACLE attack. This is a loophole that potentially allows cybercriminals to reveal VPN users private data. VORACLE attack can affect VPN services that are based on OpenVPN® protocol.

Our team is sure you should stay on top of the cyber security news. That’s why we’d like to get things straight and tell you everything about this attack in detail. What is OpenVPN® protocol? How does the VORACLE attack work? Are KeepSolid VPN Unlimited users safe? Keep reading and get the answers!

What is OpenVPN® protocol?

First things first, let’s figure out what this protocol is and what its vulnerability appeared to be. VPN protocol is a set of processes that ensures that your VPN connection is fast and safe. In a nutshell, it is an algorithm suite that connects your device to a VPN server. VPN apps often offer their users a variety of protocols.

OpenVPN®, in turn, is the youngest and most widely used protocol. One of its main advantages is an open-source nature that allows developers to freely modify this protocol. It runs over User Datagram Protocol (UDP) or Transmission Control Protocol (TCP) tunnels, making users’ VPN traffic indistinguishable from a standard one. OpenVPN® also supports popular operating systems such as iOS, macOS, Windows, Android, and Linux.

Structure of how OpenVPN protocol encrypts remote computer

The weakness of OpenVPN® protocol turned out to be in its compression algorithms. The thing is, in order to encrypt your private data, OpenVPN® has to compress it first. This is made to expedite the work of a VPN app. Unfortunately, this played a trick on OpenVPN protocol users. 

How does VORACLE attack work?

Long story short, VORACLE can decode HTTP traffic of VPN users. HTTP stands for Hypertext Transport Protocol and it is a basic insecure protocol of websites. You can identify such a website by http:// in its link address (learn more about how to recognize a suspicious link in our previous article). So, if a hacker lures a user to a compromised website, the VORACLE attack can reveal their personal data while OpenVPN® is compressing it.

In order for a hacker to successfully use VORACLE attack, certain conditions should be met:

  • You use a VPN app that enables compression by OpenVPN® protocol
  • Cyber criminal has to be in the same network as you are
  • You use a web browser that is vulnerable to VORACLE attack (any web browser except Google Chrome)
  • You visit a website with HTTP connection
  • Hacker controls the aforementioned website or has previously inserted a malicious code to a legitimate site
VORACLE attack has caused a huge stir among VPN society. But in fact, its effectiveness is limited by the difficulty of its performance. Click To Tweet

Are KeepSolid VPN Unlimited users safe?

Absolutely! Since KeepSolid VPN Unlimited developers fixed this vulnerability in our OpenVPN® protocol, the users of our security solution are completely safe. The privacy of our users is our key concern and we did our best to ensure that you are secured. VORACLE attack caused a huge stir among VPN society. But in fact, its effectiveness is limited by the difficulty of its performance. Our team left no chance for cyber criminals to use it, so you have nothing to worry about.

“OpenVPN” is a registered trademark of OpenVPN Inc.


  1. Francis John Drumm
    October 4, 2018 - 4:34 pm

    Being aged and not a computer buff, I often feel vulnerable when faced with the the technicalities of the of the internet. I am, therefore, very grateful that I am safe in your hands and greatly appreciate your advice and assurance

    • Hello Francis John,
      Thanks for letting KeepSolid VPN Unlimited stay on guard of your online privacy! Our team constantly works to ensure our users are totally safe with us.
      So as not to miss our latest news and security tips, subscribe to our monthly digest to get the best hand-picked articles right into your inbox!

  2. Why is goigle chrome not affected over mozilla or firefox

    • Hi Darren,
      That’s a good question. It is explained by the differences in the way browsers send HTTP requests. The very peculiarities of the technical realization of this process in Google Chrome makes it immune to the attack.
      But as long as we’ve eliminated the vulnerability, with VPN Unlimited on, you can use whatever browser you like!

  3. I haven’t a clue about this, but thanks for your security package. I need to learn more.

    • Hey Chris,
      Thanks for your feedback! Our goal is to make you, our users, aware of possible cyber threats & provide useful tips on how to stay secure. Subscribe to our newsletter to get our monthly digest with the latest articles!

  4. _How_ did you fix the vuln?

    • Hi John,
      For security reasons, we cannot reveal the technical details of the fixes made by our developers. But as stated, you can be sure that any risk of the VORACLE attack is eliminated and you’re completely safe with VPN Unlimited!

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