Theo's Infosec Blog

Mostly Infosec thoughts, stories and ideas. Sharing things I learn.

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Setting Up Discourse With Mailgun On A DigitalOcean One-Click Application Server

Setting Up Discourse With Mailgun On A DigitalOcean One-Click Application Server

If you're having mail rejected saying it's coming from noreply@discourse.do.co or you're wondering why dmarc isn't set up, this article may help.You may have noticed, or may not have,

  • Ted LeRoy
    Ted LeRoy
4 min read
Harden Your Docker Deployment With Free Tools

Harden Your Docker Deployment With Free Tools

With Docker vulnerabilities in the news of late, it makes sense to have a look at hardening your deployments, especially any that are exposed to the Internet.Doomsday Docker security hole article on

  • Ted LeRoy
    Ted LeRoy
2 min read
Use Center for Internet Security - CIS Benchmarks to Secure Your Systems

Use Center for Internet Security - CIS Benchmarks to Secure Your Systems

The Center for Internet Security has free guides that will help you secure your systems. A typical corporate environment may have a broad array of systems, including routers, switches, and firewalls from vendors

  • Ted LeRoy
    Ted LeRoy
6 min read
Treat Yourself To More Linux Server Knowledge

Treat Yourself To More Linux Server Knowledge

$9.99 coupon for my Udemy Ubuntu Linux Fundamentals course.

  • Ted LeRoy
    Ted LeRoy
1 min read
How To Update The Message Of The Day (MOTD) On Ubuntu 18.04

How To Update The Message Of The Day (MOTD) On Ubuntu 18.04

I like to have a banner display at login to my servers when I use Secure Shell (SSH) to access them. Once upon a time, this was done by putting a static message

  • Ted LeRoy
    Ted LeRoy
4 min read
Have A Ubiquiti UniFi Device? Make Sure To Change Your Default Credentials!

Have A Ubiquiti UniFi Device? Make Sure To Change Your Default Credentials!

I was checking the security logs on one of my servers as I often do and noticed attempts to log into SSH using a curious username. My servers are all set up to

  • Ted LeRoy
    Ted LeRoy
2 min read
How To Check Whether A Reboot Is Required After Updates in Ubuntu

How To Check Whether A Reboot Is Required After Updates in Ubuntu

Wouldn't it be cool to know whether a reboot is needed after installing updates on your Ubuntu Server without having to log in again to check the Message of the Day (MOTD) to

  • Ted LeRoy
    Ted LeRoy
1 min read
Top 5 Free Tutorials for Linux Beginners

Top 5 Free Tutorials for Linux Beginners

If you've just started using Linux, or haven't yet, but want to, this article may help. It points you to some books, online learning courses, and videos available for free! It will help

  • Ted LeRoy
    Ted LeRoy
1 min read
Securing Remote Access For Linux

Securing Remote Access For Linux

I've created a free 7 part video tutorial on how to set up key based authentication for Linux. You'll learn how to: Install OpenSSH Server on your Ubuntu 16.04 LTS server Connect

  • Ted LeRoy
    Ted LeRoy
1 min read
Free Security Hardening Resources

Free Security Hardening Resources

Here are a few resources that will greatly help you in securing your operating system(s) and network for free! STIG Viewer Unified Compliance Framework's (UCF's) Security Technical Implementation Guides (STIG's) provide a

  • Ted LeRoy
    Ted LeRoy
1 min read
SANS Holiday Hack Challenge

SANS Holiday Hack Challenge

Do you want to learn to hack and thereby how to defend web sites? Try the SANS Holiday Hack Challenge. Shout out to Jeff V. (@mrvaughan) for the tweet about this!

  • Ted LeRoy
    Ted LeRoy
1 min read
Excellent Free Intro To Linux Course On edX

Excellent Free Intro To Linux Course On edX

If you're not familiar with edX, they have many informative and interesting free online courses. I came across one that really impresses me, and I'm sharing it with you! I'm providing the link

  • Ted LeRoy
    Ted LeRoy
2 min read
New Course - Ubuntu Linux Fundamentals On Udemy

New Course - Ubuntu Linux Fundamentals On Udemy

Howdy readers! I've recently released a new course on Udemy called "Ubuntu Linux Fundamentals - Learn Linux Server with Ubuntu" Here's a coupon for 90% off. It's normally $100, but you

  • Ted LeRoy
    Ted LeRoy
2 min read
Blog Was Offline For A Bit

Blog Was Offline For A Bit

Howdy readers, I apologize, but the blog was down for about 5 days. I had two things going on, and it took me some time to resolve them. The good news is, the

  • Ted LeRoy
    Ted LeRoy
1 min read
Disqus Comment Broker Suffers Data Breach

Disqus Comment Broker Suffers Data Breach

Disqus, recommended by Ghost and used by many, including this blog, hacked Disqus, a provider of comment features for many blogs, including this one, has announced a hack. Information on people who used

  • Ted LeRoy
    Ted LeRoy
1 min read
Be Alerted If Your Account Was Compromised - haveibeenpwned.com

Be Alerted If Your Account Was Compromised - haveibeenpwned.com

Millions upon millions of accounts are compromised every year. It is very likely that the account for some web site or online service you use has been exposed by an attack. How can

  • Ted LeRoy
    Ted LeRoy
3 min read
Camera Lens Scam on Amazon

Camera Lens Scam on Amazon

I just came across this article by Ziemowit Pierzycki about how he was scammed out of $1,500 for a camera lens he bought on Amazon. He seems to present clear evidence that

  • Ted LeRoy
    Ted LeRoy
3 min read
Renewing LetsEncrypt Certificate When Using Cloudflare

Renewing LetsEncrypt Certificate When Using Cloudflare

I recently suffered a little down time on my site due to my letsencrypt certificate expiring and having some difficulty renewing because I'm using CloudFlare's Content Delivery Network in front of my site.

  • Ted LeRoy
    Ted LeRoy
4 min read
Beginner's Guide To Creating A Ghost Powered Blog

Beginner's Guide To Creating A Ghost Powered Blog

Learn how to create your own blog using Ghost, an an open source WordPress alternative. My latest creation. A new course on Udemy. If you're new to blogging, or considering starting one, and

  • Ted LeRoy
    Ted LeRoy
1 min read
Ghost 1.0 Released

Ghost 1.0 Released

It's here! Ghost Publishing Platform Version 1.0. On 27 July, 2017, John O'Nolan announced the release of Ghost Version 1.0. For those of you who haven't heard of Ghost, it is

  • Ted LeRoy
    Ted LeRoy
1 min read
New Free Course and Certification - KLCP

New Free Course and Certification - KLCP

Offensive Security announced a new, free Kali Linux Certified Professional Course and Certification Have you been looking to learn how to Penetration Test? Muts and crew have announced a new, free course and

  • Ted LeRoy
    Ted LeRoy
1 min read
Using Fingerprints At Food Kiosks? There Are Risks.

Using Fingerprints At Food Kiosks? There Are Risks.

Brian Krebs breaks story that Avanti, a self-service food kiosk vendor, was hacked. Avanti Markets, a vendor with "micro markets" in many corporate offices throughout the United States, has had a

  • Ted LeRoy
    Ted LeRoy
1 min read
Nikto - The Web App Scanning Tool - It's Origin

Nikto - The Web App Scanning Tool - It's Origin

One of my esteemed colleagues was familiar with the popular open source web application scanning tools, Nikto, but was unaware of the origin of the name. As I mentioned, Nikto is a popular

  • Ted LeRoy
    Ted LeRoy
1 min read
How to Safely Check Suspicious Links

How to Safely Check Suspicious Links

In case you weren't aware of it, your computer can become infected with malware by visiting an infected site, even if you don't click on anything upon hitting the site. It is called

  • Ted LeRoy
    Ted LeRoy
2 min read
Upgrading Ghost

Upgrading Ghost

Here are a few things I learned when upgrading my Ghost server. I tried first simply installing with the instructions provided on ghosts site. I started troubleshooting, and it went downhill fast, so

  • Ted LeRoy
    Ted LeRoy
1 min read
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