Security Hardening

FreeBSD 12 — rubygem-activestorage — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — rubygem-activestorage — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 24 July 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: Rails — multiple vulnerabilities Related CVEs: CVE-2020-8162 CVE-2020-8164 CVE-2020-8165 CVE-2020-8166 CVE-2020-8167 Upstream summary: Ruby on Rails blog: Hi everyone! Rails 5.2.4.3 and 6.0.3.1 have been released! These releases contain important […]

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Oracle Linux 8 — python27:2.7 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — python27:2.7 — vulnerability — patch and remediation guide (ELSA-2020-4654)

🟡 Medium   ⏱ 10–30 min  Last verified: 24 July 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-4654 Related CVEs: CVE-2019-20916 CVE-2019-20907 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

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How to Configure Group Policy Preferences on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure Group Policy Preferences on Windows Server 2016

How to Set Up Windows Server 2016 Group Policy Preferences Group Policy Preferences (GPP) extend the traditional Group Policy settings model by providing a richer set of configuration items that can be applied, updated, or removed based on targeting conditions. Introduced in Windows Server 2008 and fully supported in Windows Server 2016, GPP covers drive […]

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Common Problems 118510

Ubuntu 16.04 shutdown hangs for several minutes

🟡 Medium   ⏱ 5–30 min  Last verified: 23 July 2020 📖 ~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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Common Problems 117460

Ubuntu 20.04 LTS LVM Volume Does Not Extend

🟡 Medium   ⏱ 5–30 min  Last verified: 23 July 2020 📖 ~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 Network Bonding on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Configure Network Bonding on SLES 15

Introduction This tutorial covers How to Configure Network Bonding on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to date: zypper refresh […]

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openSUSE Tumbleweed — nethack — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — nethack — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory openSUSE-SU-2025:14898-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-5253 Upstream summary: NetHack before version 3.6.0 allowed malicious use of escaping of characters in the configuration file (usually .nethackrc) which could be exploited. This […]

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Debian 10 — gst-libav1.0 — vulnerability — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — gst-libav1.0 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 23 July 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker 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 […]

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How to Configure ZFS on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Configure ZFS on Debian 10

Introduction How to Configure ZFS on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 10. This tutorial […]

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Debian 10 — net-snmp — vulnerability — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — net-snmp — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 23 July 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-15861 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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