Security Hardening

Ubuntu 16.04 — php-nette — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — php-nette — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 8 March 2021 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5983-1 Related CVEs: CVE-2020-15227 Upstream summary: Cyku Hong discovered that Nette was not properly handling and validating data used for code generation. A remote attacker could possibly use this issue […]

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Arch Linux — cups — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — cups — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202102-13 Related CVEs: CVE-2020-10001 Upstream summary: Type: information disclosure. Status: Fixed. Affected: 1:2.3.3op1-1. Fixed in: 1:2.3.3op2-1. Group: AVG-1529. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis […]

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Ubuntu 18.04 — grilo — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — grilo — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 8 March 2021 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5055-1 Related CVEs: CVE-2021-39365 Upstream summary: Michael Catanzaro discovered that grilo incorrectly handled certain TLS certificate verification. An attacker could possibly use this issue to MITM attacks. Table of contents […]

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How to Configure Just Enough Administration (JEA) on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure Just Enough Administration (JEA) on Windows Server 2016 (WINDOWS-SERVER-2016)

How to Configure Windows Server 2016 Just Enough Administration Just Enough Administration (JEA) is a PowerShell security technology in Windows Server 2016 that enables role-based access control for administrative tasks. JEA allows you to grant specific users limited administrative capabilities without giving them full administrator rights. A JEA endpoint defines exactly which PowerShell commands a […]

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Common Problems 119102

Ubuntu 14.04 LTS unattended-upgrades repeatedly fails

🟡 Medium   ⏱ 5–30 min  Last verified: 7 March 2021 Affected versions: 14.04 LTS 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]

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Oracle Linux 8 — nodejs:14 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — nodejs:14 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2023-0050)

🟡 Medium   ⏱ 10–30 min  Last verified: 7 March 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-0050 Related CVEs: CVE-2021-44906 CVE-2022-0235 CVE-2022-3517 CVE-2022-43548 CVE-2022-24999 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative […]

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Gentoo Linux — net-ftp/pure-ftpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — net-ftp/pure-ftpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202003-54 Related CVEs: CVE-2020-9274 CVE-2020-9365 Upstream summary: Multiple vulnerabilities have been discovered in Pure-FTPd. Please review the CVE identifiers referenced below for details. Table of contents Symptom & Impact Environment & Reproduction […]

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How to Monitor System Resources on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Monitor System Resources on Oracle Linux 8

Introduction Setting up monitor system resources on oracle linux 8 on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Monitor System Resources on Oracle Linux 8, with all the commands you need, the SELinux and firewalld considerations to keep in […]

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Common Problems 118391

Ubuntu 16.04 Wi-Fi disconnects or fails to reconnect

🟡 Medium   ⏱ 5–30 min  Last verified: 7 March 2021 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]

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How to Configure Kerberos Authentication on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Configure Kerberos Authentication on IBM AIX 7.1

Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure kerberos authentication on ibm aix 7.1 on IBM […]

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