Those who have only recently started operating their own mail server may have already noticed that their own e-mails are not always accepted by other servers and quickly end up in the spam suspicion folder. In fact, there are a few things to consider if you want to be accepted into the league of reputable…
We will play through setting up, configuring and testing a mail server under Linux, this is the beginning of a series of articles in which the mail server serves only as an SMTP relay. But we will come to that later, here it is all about our Linux mailserver with webmail login.
It is important to us to explain the functioning and interaction of the mail server components in such a way that the mail system as such can be understood in its basic features. We assume basic knowledge of Linux servers; nevertheless, this guide is also suitable for beginners who are interested and have the time.
Eine technische Analyse von Angriffsvektoren und deren Abwehr im mehrstufigen AD-Modell Im ersten Beitrag unserer Reihe haben wir die grundlegenden Konzepte des AD Hardening im Tiering-Modell betrachtet. Nun werden wir einen Schritt weiter gehen und uns detailliert mit der praktischen Simulation von Pass-the-Ticket-Angriffen befassen – einer der gefährlichsten Angriffsarten gegen Active Directory-Umgebungen – und wie…
ZusammenfassungDie Implementierung eines Active Directory (AD) Tiering-Modells in Kombination mit systematischem Hardening stellt eine der effektivsten Maßnahmen zur Abwehr von Identity-basierten Angriffen dar. Durch die strikte Segmentierung administrativer Zugriffe in Tier 0 (Kernidentitätssysteme), Tier 1 (Server-/Applikationsadministration) und Tier 2 (Client-Management) wird Lateral Movement erschwert, während gleichzeitig Angriffsvektoren wie Pass-the-Hash, Golden Ticket-Angriffe oder Credential-Theft-Methoden massiv eingedämmt…
On Patchday in May, Microsoft eliminates 55 security problems. Security patches are available for download for Hyper-V, Internet Explorer, Office, SharePointServer and Windows, among others. Anyone using Microsoft software should ensure that Windows Update is active and the patches are installed. Of the 55 vulnerabilities, four vulnerabilities are rated „critical“ by Microsoft. A vulnerability (CVE-2021-31166)…
ATTENTION! Encrypting data can serve to protect privacy or sensitive data, but it also means that manual decryption can make it more difficult to recover any data that may be required in the future. A decision for or against data encryption should therefore not be made lightly. An individual risk-benefit analysis based on the application…
Security expert Gene Spafford was obviously right. The NSA scandal has made it clear that there can be no absolute security for electronic data – neither from access by Internet criminals nor from government espionage activities.
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