Security Hardening

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

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

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2025-3017 Related CVEs: CVE-2021-3624 Upstream summary: There is an integer overflow vulnerability in dcraw. When the victim runs dcraw with a maliciously crafted X3F input image, arbitrary code may be […]

Read more
Oracle Linux 8 — Unbreakable Enterprise kernel-container — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Unbreakable Enterprise kernel-container — vulnerability — patch and remediation guide (ELSA-2022-9013)

🟠 High   ⏱ 15–60 min  Last verified: 7 March 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-9013 Related CVEs: CVE-2021-4155 CVE-2021-0920 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

Read more
Arch Linux — jupyterlab — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — jupyterlab — vulnerability — 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-202108-10 Related CVEs: CVE-2021-32797 Upstream summary: Type: cross-site scripting. Status: Fixed. Affected: 3.1.2-1. Fixed in: 3.1.4-1. Group: AVG-2266. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis […]

Read more
Oracle Linux 8 — libgcrypt — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — libgcrypt — vulnerability — patch and remediation guide (ELSA-2022-5311)

🟡 Medium   ⏱ 10–30 min  Last verified: 7 March 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-5311 Related CVEs: CVE-2021-40528 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

Read more
How to Configure 802.1X Network Access Control on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure 802.1X Network Access Control on Windows Server 2019

Introduction to 802.1X Network Access Control 802.1X is an IEEE standard for port-based network access control. It ensures that only authenticated and authorized devices can connect to a network—whether wired or wireless. In an enterprise environment, 802.1X prevents unauthorized devices (laptops, phones, IoT devices) from simply plugging into a network port or connecting to a […]

Read more
Oracle Linux 8 — kernel security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — kernel security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2024-3138)

🟡 Medium   ⏱ 10–30 min  Last verified: 6 March 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2024-3138 Related CVEs: CVE-2023-42755 CVE-2023-52448 CVE-2024-25742 CVE-2024-25743 CVE-2023-52620 CVE-2023-24023 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

Read more
Common Problems 121533

Debian 9: chrony not syncing and system clock drift

🟡 Medium   ⏱ 5–30 min  Last verified: 6 March 2021 Affected versions: Debian 9 📖 ~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 & […]

Read more
Common Problems 118106

Ubuntu 18.04 LTS – Nginx fails to start due to configuration syntax errors – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 6 March 2021 Affected versions: Ubuntu 18.04 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 […]

Read more
Common Problems 114977

Kernel Updates Installed but Old Kernel Keeps Booting

🟡 Medium   ⏱ 5–30 min  Last verified: 6 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 […]

Read more
CHAT