Security Hardening

Common Problems 113601

Windows Server 2012 R2 — Volume Shadow Copy service provider timeout — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 13 August 2020 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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Amazon Linux 2 — librepo — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — librepo — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2020-1568 Related CVEs: CVE-2020-14352 Upstream summary: A flaw was found in librepo. A directory traversal vulnerability was found where it failed to sanitize paths in remote repository metadata. An attacker […]

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How to Take ZFS Snapshots on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Take ZFS Snapshots on FreeBSD 12

Introduction FreeBSD 12 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up take zfs snapshots on freebsd 12 on FreeBSD 12 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any Linux distribution. […]

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Oracle Linux 8 — libvncserver — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — libvncserver — vulnerability — patch and remediation guide (ELSA-2020-3385)

🟠 High   ⏱ 15–60 min  Last verified: 13 August 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-3385 Related CVEs: CVE-2017-18922 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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Debian 10 — golang-1.11 — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — golang-1.11 — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 13 August 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-9512 CVE-2019-16276 CVE-2019-17596 CVE-2020-7919 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches […]

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How to Install PHP 7.4 with PHP-FPM on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install PHP 7.4 with PHP-FPM on Debian 10

Introduction How to Install PHP 7.4 with PHP-FPM 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 […]

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Debian 10 — libopenmpt — vulnerability — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — libopenmpt — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 13 August 2020 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-14380 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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openSUSE Tumbleweed — libsane1 — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libsane1 — multiple vulnerabilities (6 CVEs) — 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-2020:1791-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-12861 CVE-2020-12862 CVE-2020-12865 CVE-2020-12866 CVE-2020-12867 CVE-2017-6318 Upstream summary: A heap buffer overflow in SANE Backends before 1.0.30 allows a malicious device connected to the same […]

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Common Problems 121194

Debian 10: High CPU load caused by runaway cron task

🟡 Medium   ⏱ 5–30 min  Last verified: 12 August 2020 Affected versions: Debian 10 📖 ~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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Common Problems 118928

Could Not Get Lock /var/lib/dpkg/lock on Ubuntu 14.04

🟡 Medium   ⏱ 5–30 min  Last verified: 12 August 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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