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Server Security

We have thousands of posts on a wide variety of open source and security topics, conveniently organized for searching or just browsing.

There are several reasons why Linux has such a good reputation and has become such a good standard across the world. It is the power behind most internet servers and cloud infrastructures as well as billions of Android devices. It is stable, has cons...

Accepting file uploads is basically inviting strangers ...

Every system admin has lived through the same Monday mo...

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Installed Is Not Remediated: How to Verify Linux Security Patches in Production

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There are several reasons why Linux has such a good reputation and has become such a good standard across the world. It is the power behind most internet servers and cloud infrastructures as well as billions of Android devices. It is stable, has consistently high-performance levels, and remains very flexible. You don’t have to deal with expensive licenses, can view and share code, and can customize any part of the interface to suit your demands. In an age of data breaches and continuous malware attacks and phishing, you can rest assured that Linux has got your back because it is much more resilient in the face of these hazards compared to other systems.

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What Happens When AI Agents Start Handling Tier-1 Linux Support Tickets

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Every system admin has lived through the same Monday morning ritual. A queue of forty tickets, half of them password resets, permission errors, or disk space warnings that any experienced technician could resolve in under two minutes. The other half require actual judgment. For years, automation promised that software would eventually sort the two apart on its own. That promise is now being tested in production Linux environments.

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Running Proxies Safely on Linux: A Hardening Guide for System Administrators

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Proxies are a standard component of a Linux administrator's toolbox. You can use them to see how services respond in various locations, to run route monitoring checks, and to retrieve public data for internal tooling. However, a proxy is an outbound tunnel with credentials attached, and on a multi-user server, it is a security risk that should be treated with the same caution as SSH or sudo. This post explains the practical measures that prevent a proxy setup from becoming a weak point in an otherwise hardened host.

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How Memory Leaks Affect System Stability and Security

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A process with a stable workload shouldn't keep growing its resident memory. When it does, the first question isn't how much RAM is available. It's where the allocations stopped being released. On Linux, that answer isn't always obvious because the kernel, allocator, and application all influence what memory usage looks like from the outside.

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Misuse of Cron Jobs for Long-Term Access in Linux Environments

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Cron has existed in Unix and Linux environments for decades, handling backups, cleanup scripts, patching jobs, log rotation, monitoring tasks, and other maintenance work that administrators do not want to run manually. Most Linux servers rely on it constantly, which is exactly why attackers continue abusing it for persistence after a system has already been compromised.

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Linux AI Tools Require Enhanced Observability for Security

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Linux security has traditionally depended on logs, metrics, and alerts. That model works well when systems behave predictably. Inputs come in, processes run, events get logged. Security teams can usually reconstruct what happened afterward without too much trouble.

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Zero Trust for Email: Implementing Advanced Protections on Linux

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Email threats have long outgrown spamming and obvious phishing. Attackers now exploit trust itself. They impersonate internal users, hijack legitimate threads, and abuse misconfigured configurations. Defenses like perimeter filtering or static rules are not adequate any longer. A Zero Trust model redefines the issue by eliminating implicit trust at all phases of email processing. This shift is especially important in modern Linux mail environments where services are often modular, network-exposed, and heavily dependent on correct configuration across multiple components.

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Linux Strapi Medium Redis RCE Threats from Malicious npm Packages

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The first week of April 2026 marked a significant escalation in supply chain tactics. A coordinated campaign involving 36 malicious npm packages, disguised as Strapi CMS plugins, was uncovered by security researchers. This was not a broad, opportunistic "grab" for credentials. Forensic evidence, including hardcoded credentials and internal hostname checks, reveals a surgical strike against the cryptocurrency platform Guardarian. By weaponizing a trusted development workflow, attackers achieved a total compromise. Moving from initial execution to database theft and long-term persistence in minutes.

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Ubuntu’s GRUB Change: Fixing a Problem… or Creating One

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At some point, it stopped being “load kernel and go” and turned into this thing that tries to understand every filesystem, every storage setup, encryption, all of it, before the system is even running. And that’s where it keeps biting people. If you’ve dealt with GRUB breaking, it’s almost never the basic path. It’s trying to read something slightly non-standard and just falling over. Btrfs layouts, LVM stacking, and encrypted setups, stuff that works fine once the kernel is up, but GRUB has to guess at it first. The more GRUB understands, the more it can get wrong. This isn’t about “GRUB is bad,” it’s that GRUB turned into something way bigger than a bootloader, and now it carries all the risk that comes with that.

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Linux Server Monitoring Challenges and Solutions for Security Teams

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Linux shows up in places most people stop noticing. Web servers, Kubernetes nodes, build runners, database backends. Start tracing how modern platforms actually run, and a large portion of that infrastructure lands on Linux systems, which quietly turns linux server security into a much bigger conversation than protecting individual hosts.

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Linux Security in 2026 Hardening Monitoring and Defense Strategies

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Linux runs an enormous share of the modern internet - cloud workloads, web backends, containers, routers, IoT devices, and the quiet infrastructure nobody notices until it breaks. That ubiquity is exactly why attackers keep coming back to it. If you can compromise Linux at scale, you don’t just get one machine. You get leverage: access paths, compute, data, and sometimes an entire supply chain.