Pentesting, System Hardening & IT Security Blog

Our passion for testing and defending infrastructures, applications and companies often leads us to the point where we want to share our thoughts and experience with the world. Here you can read all about our exploits and research and enjoy our posts, from useful howtos, to published CVEs, management strategies, new exciting tools and much more. As a provider of offensive and defensive IT services, we always welcome readers to reach out to us and ask questions or provide feedback, be it about our blog or our services, which include web-application and network penetration tests, system defense and hardening and management consulting, among others.

In preparation for a new web security training course (german, coming soon), I had another look at the current version of the Damn Vulnerable Web App (DVWA). As I documented the solution for the command injection vulnerability on high, I found something that sparked a tiny idea how this part might b...

Yesterday at around 10:00 pm, I noticed that something was wrong with Steam. The interface suddenly presented itself in different languages and kept switching. I tried to switch back to english but got an error message that something went wrong. A little bit of poking around in the settings showe...

Now matter how much you want to secure your mail server, to be able to actually communicate with your customers and partners, you will have to face the ugly truth that enforcing STARTTLS might not be the best idea from a business perspective. Using opportunistic encryption, meaning to encrypt mail...

Internal encryption in company networks is important and something that's done relatively easy. By creating your own certificate authority (CA) and signing your server certificates with it, you can establish a centralized point of trust on all your devices, making it much more easy for you to mainta...

Whenever I'm connecting to a new remote server via SSH, I tend to verify the fingerprint to make sure that I'm actually connecting to my own machine. Usually it's not that big a deal as I'm simply comparing two strings, but what if those two strings are created with two different hashing algorithms?...