Linux

Debian 9 — xen — multiple vulnerabilities (11 CVEs) — patch and remediation guide — diagnosis and fix on Debian 9

Debian 9 — xen — multiple vulnerabilities (11 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 1 March 2020 Affected versions: Debian 9 (stretch) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2017-10912 CVE-2017-14316 CVE-2017-17563 CVE-2018-8897 CVE-2019-17349 CVE-2018-12891 CVE-2018-3620 CVE-2018-19961  +3 more Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – […]

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Common Problems 118472

Ubuntu 16.04 Swap Not Activating After Reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 29 February 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 Set Up Docker Multi-Stage Builds on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up Docker Multi-Stage Builds on Debian 9

Introduction This guide explains how to Set Up Docker Multi-Stage Builds on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install with […]

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How to Set Up Unbound DNS Resolver on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up Unbound DNS Resolver on Debian 10

Introduction Deploying set up unbound dns resolver on debian 10 on a Debian 10 Buster machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Before […]

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Common Problems 114979

RHEL 8 – chronyd Unsynchronized Time Causes Authentication Failures

🟡 Medium   ⏱ 5–30 min  Last verified: 29 February 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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Ubuntu 16.04 — rake — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — rake — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 February 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4295-1 Related CVEs: CVE-2020-8130 Upstream summary: It was discovered that Rake incorrectly handled certain files. An attacker could use this issue to possibly execute arbitrary commands. Table of contents Symptom […]

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Ubuntu 16.04 — dovecot — multiple vulnerabilities (12 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — dovecot — multiple vulnerabilities (12 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 29 February 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4674-1 Related CVEs: CVE-2020-24386 CVE-2020-25275 CVE-2020-12100 CVE-2020-12673 CVE-2020-12674 CVE-2019-11500 CVE-2019-7524 CVE-2019-3814  +4 more Upstream summary: It was discovered that Dovecot incorrectly handled certain imap hibernation commands. A remote authenticated attacker […]

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SLES 15 — evince — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — evince — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 29 February 2020 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2019:14141-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-1010006 CVE-2010-2640 CVE-2010-2641 CVE-2010-2642 CVE-2010-2643 CVE-2017-1000083 CVE-2019-11459 Upstream summary: Evince 3.26.0 is affected by buffer overflow. The impact is: DOS / Possible code execution. The […]

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Arch Linux — pacman — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — pacman — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-201910-13 Related CVEs: CVE-2019-18183 CVE-2019-18182 CVE-2019-9686 Upstream summary: Type: arbitrary command execution. Status: Fixed. Affected: 5.1.3-1. Fixed in: 5.2.0-1. Group: AVG-1049. Table of contents Symptom & Impact Environment & Reproduction […]

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How to Use Makefile for Build Automation on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Use Makefile for Build Automation on RHEL 8

GNU Make is one of the oldest and most reliable build automation tools in software development, yet it remains deeply relevant in modern DevOps workflows. A Makefile acts as a self-documenting command runner that codifies every build, test, lint, and deploy action in a single file that any developer or CI system can invoke with […]

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