**By:** webdevel@sparkhausmedia.com (Anonymous User (Linux Magazine))
© Lead Image © peshkov, 123RF.com
Security is more than a firewall.
The biggest worry is what happens when an intruder gets inside.
We take a look at some common misconfiguration issues that can lead to privilege escalation.
When configuring and deploying a new machine, security is a primary consideration.
Most security analyses focus on vulnerabilities in network-facing services.
Activities such as updating the kernel to the latest stable version, configuring a perimeter firewall, and implementing Multi-Factor Authentication for SSH access are now standard practices for any system administrator.
Yet, many Linux servers considered “hardened” hide often-overlooked systemic vulnerabilities, including misconfigurations at the filesystem and local services level.
Whether you administer a web server, a VPN gateway, or a Linux-based firewall, non-least-privilege permissions, poorly designed tasks, exposed management services, and insufficiently verified trust relationships can create unexpected paths for privilege escalation.
The concept of an attack surface is often defined solely by perimeter defenses, but a perimeter strategy is not enough.
Conceptually, it makes much more sense to divide the surface into two areas: the external and the internal.
The external includes open ports and exposed services, and the internal is where a user who already has local access can cause truly significant damage.
A remote exploit isn’t necessarily needed to compromise a system; a user with limited access who manages to gain root privileges through misconfigurations is decidedly more worrying.
[…]
Even a small configuration error or oversight can create an opening for privilege escalation.
These real-world escalation techniques will help you understand what to watch for.
Scary things can happen if you don’t keep your CMS up to date.
We’ll show you how an unpatched vulnerability can lead to privilege escalation and root access.
We’ll show you some tricks for configuring the root password popup window on Red Hat-based systems.
To protect your production server from attacks, employ these common security tools to help safeguard your system.
Today’s security environment is a tumultuous landscape riddled with threats.
AppArmor offers an extra ring of protection for your system, and it is easier to learn and implement than many alternative mandatory access control solutions.
KDE Connect reveals the goals for the Linux desktop darling, with one of those goals long overdue.
Fedora 45 beta has been released with updated Gnome, KDE Plasma, and kernel.
Ubuntu 26.10 has completed its migration to the Rust-based coreutils.
A Linux developer used AI to fix bottlenecks that caused problems when building the kernel.
The resulting AI-generated code needed a lot of work.
Brazilian patent BRPI0109962B1 has expired, which means that DivX and Xvid are no longer problematic for Linux, but it doesn’t mean that video is all of a sudden fully unleashed.
Thanks to AI bug hunters, the Linux kernel is seeing record numbers of vulnerabilities, and it’s overwhelming developers.
So long as Linux is distributed under the GPL, MIT, BSD, and Apache licenses, the OS is exempt from being required to verify the age of its users in California.
35 years ago, a Finnish student began a humble project that would forever change the course of technology.
China has ordered several government agencies to drop a Chinese-developed version of Windows 10 in favor of either KylinOS or UOS.
With continued DRAM and eMMC shortages, Pine64 has decided to discontinue production of Linux devices.
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**📚 Original Source:**
[Protecting the Internal Attack Surface](http://www.linux-magazine.com/Issues/2026/310/Internal-Attack-Surface)
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