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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-2021-1811)

🟡 Medium   ⏱ 10–30 min  Last verified: 5 June 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-1811 Related CVEs: CVE-2020-14397 CVE-2020-25708 CVE-2019-20839 CVE-2018-21247 CVE-2020-14405 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-mail/fetchmail — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — net-mail/fetchmail — 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-202209-14 Related CVEs: CVE-2021-36386 CVE-2021-39272 Upstream summary: Multiple vulnerabilities have been discovered in Fetchmail. Please review the CVE identifiers referenced below for details. Table of contents Symptom & Impact Environment & Reproduction […]

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SLES 12 — python-M2Crypto — vulnerability — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — python-M2Crypto — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 5 June 2021 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory SUSE-FU-2024:1448-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-25657 Upstream summary: A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption […]

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How To Set Up and Configure a Certificate Authority (CA) On Ubuntu 20.04 — step-by-step Linux tutorial on Progressive Robot

How To Set Up and Configure a Certificate Authority (CA) On Ubuntu 20.04

A private Certificate Authority that runs on Ubuntu 20.04 will enable you to configure, test, and run programs that require encrypted connections between a client and a server. Using a private CA, you can issue certificates for users, servers, or individual programs and services within your infrastructure. A private CA can help ensure that all your development, staging, and production environments use similar architectures and configurations.

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How to Install Composer on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install Composer on RHEL 7

How to Install Composer on RHEL 7 Composer is the standard dependency manager for PHP, used by virtually every modern PHP framework and library ecosystem. It reads a composer.json file in your project to resolve and download the exact library versions your application requires, storing them in a vendor/ directory and generating an autoloader that […]

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Oracle Linux 8 — kernel — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — kernel — security and stability fixes — required update (ELSA-2021-2168)

🟠 High   ⏱ 15–60 min  Last verified: 4 June 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-2168 Related CVEs: CVE-2021-3543 CVE-2021-3501 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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Common Problems 118606

Ubuntu 16.04 LTS – TLS connections fail due to outdated CA certificates

🟠 High   ⏱ 5–30 min  Last verified: 4 June 2021 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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 […]

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Common Problems 117491

Ubuntu 20.04 LTS sudo Fails With PAM Authentication Error

🟠 High   ⏱ 5–30 min  Last verified: 4 June 2021 Affected versions: 20.04 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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